Outback Power Systems Welding System GS8048 User Manual

Radian Series Inverter/Charger  
GS8048  
Operator’s Manual  
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Important Safety Instructions  
READ AND SAVE THESE INSTRUCTIONS!  
This manual contains important safety instructions for the Radian Series Inverter/Charger. Read all  
instructions and cautionary markings on the inverter and on any accessories or additional equipment  
included in the installation. Failure to adhere to these instructions could result in severe shock or  
possible electrocution. Exercise extreme caution at all times to prevent accidents.  
Audience  
This manual is intended for anyone required to operate the Radian Series Inverter/Charger. Operators  
must be familiar with all the safety regulations pertaining to operating this kind of equipment as  
dictated by local code. Operators must also have a complete understanding of this equipment’s  
features and functions. Do not use this product unless it has been installed by a qualified installer in  
accordance with the Radian Series Inverter/Charger Installation Manual.  
Symbols Used  
WARNING: Hazard to Human Life  
This type of notation indicates that the hazard could be harmful to human life.  
CAUTION: Hazard to Equipment  
This type of notation indicates that the hazard may cause damage to the equipment.  
IMPORTANT:  
This type of notation indicates that the information provided is important to  
the installation, operation and/or maintenance of the equipment. Failure to  
follow the recommendations in such a notation could result in voiding the  
equipment warranty.  
Definitions  
The following is a list of initials, terms, and definitions used in conjunction with this product.  
Table 1  
Definition  
Terms and Definitions  
Term  
12V AUX  
AC  
Auxiliary connection that supplies 12 Vdc to control external devices.  
Alternating Current; refers to voltage produced by the inverter, utility grid, or generator  
Advanced Generator Start  
AGS  
CSA  
Canadian Standards Association; establishes Canadian national standards and the Canadian  
Electrical Code, including C22.1 and C22.2  
DC  
Direct Current; refers to voltage produced by the batteries or renewable source  
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Important Safety Instructions  
Table 1  
Terms and Definitions  
Term  
DVM  
ETL  
Definition  
Digital Voltmeter  
Electrical Testing Laboratories; short for the company ETL Semko; refers to a certification issued by  
ETL to OutBack products indicating that they meet certain UL standards  
FCC  
Federal Communications Commission  
GND  
Ground; a permanent conductive connection to earth for safety reasons; also known as Chassis  
Ground, Protective Earth, PE, Grounding Electrode Conductor, and GEC  
Grid-interactive,  
grid-intertie, grid-tie  
Utility grid power is available for use and the inverter is a model capable of returning (selling)  
electricity back to the utility grid  
HBX  
IEEE  
High Battery Transfer; a function of the remote system display  
Institute of Electrical and Electronics Engineers; refers to a series of standards and practices for the  
testing of electrical products  
LBCO  
Low Battery Cut-Out; set point at which the inverter shuts down due to low voltage  
Light-Emitting Diode  
LED  
NEC  
National Electric Code  
NEU  
AC Neutral; also known as Common  
Off-grid  
PV  
Utility grid power  
Photovoltaic  
available for use  
is not  
RELAY AUX  
RTS  
Auxiliary connection that uses switch (relay) contacts to control external devices.  
Remote Temperature Sensor; accessory that measures battery temperature for charging  
Split-phase  
A type of utility electrical system with 2 “hot” lines that are 120 Vac with respect to neutral and 240  
Vac between the “hot” lines; common in North America  
System display  
Remote interface device (such as the MATE3), used for monitoring, programming and  
communicating with the inverter; also called “remote system display”  
UL  
Underwriters Laboratories; refers to a set of safety standards governing electrical products  
Utility grid  
The electrical service and infrastructure supported by the electrical or utility company; also called  
“mains”, “utility service”, or “grid”  
General Safety  
WARNING: Limitations on Use  
This equipment is NOT intended for use with life support equipment or other medical  
equipment or devices.  
CAUTION: Equipment Damage  
Only use components or accessories recommended or sold by OutBack Power  
Technologies or its authorized agents.  
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Table of Contents  
Important Safety Instructions ........................................................................1  
Audience .................................................................................................................................................................................1  
Symbols Used ........................................................................................................................................................................1  
Definitions...............................................................................................................................................................................1  
General Safety .......................................................................................................................................................................2  
Introduction.................................................................................................5  
Welcome to OutBack Power Technologies.................................................................................................................5  
MATE3 System Display and Controller.........................................................................................................................6  
Commissioning ............................................................................................7  
Functional Test......................................................................................................................................................................7  
Pre-startup Procedures ..................................................................................................................................................................7  
Startup.................................................................................................................................................................................................7  
Powering Down................................................................................................................................................................................8  
Adding New Devices.......................................................................................................................................................................8  
Firmware Updates ...........................................................................................................................................................................8  
Operation ....................................................................................................9  
Input Modes ...........................................................................................................................................................................9  
Generator............................................................................................................................................................................................9  
Support..............................................................................................................................................................................................10  
Grid Tied............................................................................................................................................................................................11  
UPS (Uninterruptible Power Supply).......................................................................................................................................12  
Backup ...............................................................................................................................................................................................13  
Mini Grid............................................................................................................................................................................................13  
Functions.............................................................................................................................................................................. 15  
Inverting............................................................................................................................................................................................15  
Search ................................................................................................................................................................................................16  
Input...................................................................................................................................................................................................16  
Generator..........................................................................................................................................................................................18  
Transfer..............................................................................................................................................................................................18  
Offset..................................................................................................................................................................................................19  
Battery Charging ............................................................................................................................................................................20  
Charging Steps................................................................................................................................................................................20  
Equalization .....................................................................................................................................................................................24  
Battery Temperature Compensation.......................................................................................................................................24  
Multiple-Inverter Installations (Stacking)...............................................................................................................................26  
Power Save Levels..........................................................................................................................................................................28  
Auxiliary Terminals ........................................................................................................................................................................29  
System Display-Based Functions................................................................................................................................. 32  
Advanced Generator Start (AGS) ..............................................................................................................................................32  
High Battery Transfer....................................................................................................................................................................32  
Grid Use Time ..................................................................................................................................................................................32  
Troubleshooting.........................................................................................33  
Basic Troubleshooting..................................................................................................................................................... 33  
Error Messages ................................................................................................................................................................... 39  
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Table of Contents  
Warning Messages............................................................................................................................................................ 40  
Disconnect Messages ...................................................................................................................................................... 42  
Sell Status............................................................................................................................................................................. 43  
Specifications .............................................................................................45  
Specifications for Model GS8048................................................................................................................................. 45  
Environmental Specifications ....................................................................................................................................... 46  
Regulatory Specifications............................................................................................................................................... 46  
Firmware Revision............................................................................................................................................................. 47  
Default Settings and Ranges......................................................................................................................................... 47  
Product Registration ...................................................................................49  
Extended Warranty........................................................................................................................................................... 50  
Warranty....................................................................................................51  
How to Arrange for Warranty Service ........................................................................................................................ 52  
Contacting OutBack......................................................................................................................................................................52  
Troubleshooting.............................................................................................................................................................................52  
Return Material Authorization (RMA)......................................................................................................................................52  
Returning Product to OutBack ..................................................................................................................................................53  
Out of Warranty..............................................................................................................................................................................53  
Index .........................................................................................................55  
List of Tables  
Table 1  
Table 2  
Table 3  
Table 4  
Table 5  
Table 6  
Table 7  
Table 8  
Table 9  
Table 10  
Table 11  
Terms and Definitions ...................................................................................................................................................1  
Troubleshooting............................................................................................................................................................33  
Error Troubleshooting.................................................................................................................................................39  
Warning Troubleshooting..........................................................................................................................................40  
Disconnect Troubleshooting ....................................................................................................................................42  
Sell Status Messages ....................................................................................................................................................43  
Electrical Specifications for Model GS8048..........................................................................................................45  
Mechanical Specifications for Model GS8048 .....................................................................................................45  
Environmental Specifications for All Models.......................................................................................................46  
Radian Series Interconnection Response Times to Abnormal Voltages or Frequencies (per leg).....46  
GS8048 Inverter Settings............................................................................................................................................47  
List of Figures  
Figure 1  
Figure 2  
Figure 3  
Figure 4  
Figure 5  
Figure 6  
Figure 7  
Figure 8  
GS8048 Inverter/Charger .............................................................................................................................................5  
MATE3 System Display and Controller ....................................................................................................................6  
Charging Stages Over Time ....................................................................................................................................21  
Charging Stages Over Time (Generator mode) ..................................................................................................21  
Repeated Charging Cycles.........................................................................................................................................23  
OutBack HUB4 and MATE3 ........................................................................................................................................26  
Example of Parallel Stacking Arrangement (Three Inverters)........................................................................27  
AC Test Points ................................................................................................................................................................33  
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Introduction  
Welcome to OutBack Power Technologies  
Thank you for purchasing the OutBack Radian Series Inverter/Charger. This product offers a complete  
power conversion system between batteries and AC power. It can provide backup power, sell power  
back to the utility grid or provide complete stand-alone off-grid service.  
Battery-to-AC inverting which delivers split-phase  
120/240 Vac at 60 Hz  
AC-to-battery charging from any AC source  
Uses energy from photovoltaic arrays, wind turbines, and  
other renewable resources. Use of OutBack FLEXmax  
charge controllers will optimize power production from  
PV sources.  
Dual AC inputs allow direct connection to utility grid and  
AC generator  
Rapid transfer between AC source and inverter output  
with minimal delay time  
Six selectable input modes for different applications  
Generator  
Support  
Grid Tied  
UPS (Uninterruptible Power Supply)  
Backup  
Mini Grid  
8000 watts (8 kW) continuous power at 48 Vdc  
16.97 kVA peak surge capacity  
Stackable in parallel configuration up to 10 inverters  
Modular internal design allows low idle consumption and  
high efficiency at both high and low power operation  
Field-upgradeable firmware  
Certified by ETL to UL1741 and CSA C22.2  
Uses MATE3 System Display and Controller  
Figure 1 GS8048 Inverter/Charger  
IMPORTANT:  
The Radian Series Inverter/Charger is not intended for use with the OutBack MATE or  
MATE2 System Display and Controller. It is only compatible with the MATE3 System  
Display and Controller.  
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Introduction  
MATE3 System Display and Controller  
The Radian inverter/charger has no external controls. It can operate normally without an external  
control or interface. Basic modes and settings are pre-programmed at the factory. (See page 47 for  
default settings.) The Radian inverter has no display or LED indicators. It is not possible to monitor its  
status or operating mode without a metering device.  
The MATE3 System Display and Controller (sold separately) is an OutBack product designed to  
accommodate programming and monitoring of an OutBack power system. The MATE3 provides the  
means to adjust the factory default settings to correctly match the installation where needed. It also  
provides the means to monitor system performance and troubleshoot fault or shutdown conditions.  
Once settings are modified using a MATE3, the MATE3 can be removed from the installation. The  
settings are stored in the non-volatile memory of the Radian. However, it is highly recommended to  
include a MATE3 as part of the system. This provides the means to monitor system performance and  
respond quickly should it be necessary to correct a fault or shutdown condition.  
The MATE3’s Configuration Wizard is capable of automatically configuring inverters to a series of  
preset values. This is often more efficient than attempting to manually program each setting in each  
inverter. Affected fields include system type, battery charging, and AC source configuration. (For  
more information, see the MATE3 Owner’s Manual).  
The Radian Series Inverter/Charger can only be used with MATE3 firmware revision  
NOTE:  
002.005.xxx or higher.  
IMPORTANT:  
Some functions are not based in the inverter, but are part of the MATE3  
system display’s firmware. They will not function if the system display is  
removed. These functions are listed beginning on page 32. For a detailed  
description of functions and programming, please see the MATE3 Owner’s  
Manual.  
Figure 2 MATE3 System Display and Controller  
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Commissioning  
Functional Test  
WARNING: Shock Hazard and Equipment Damage  
It is necessary to remove the cover of the Radian inverter to perform these tests. The components are close  
together and carry hazardous voltages. Use appropriate care to avoid the risk of electric shock or  
equipment damage.  
Pre-startup Procedures  
1. Ensure all DC and AC overcurrent devices are opened, disconnected, or turned off.  
2. Double-check all wiring connections.  
3. Inspect the work area to ensure tools or debris have not been left inside.  
4. Using a digital voltmeter (DVM) or standard voltmeter, verify battery voltage. Confirm the  
voltage is correct for the inverter model. Confirm the polarity.  
5. Connect the MATE3 system display, if present.  
CAUTION: Equipment Damage  
Incorrect battery polarity will damage the inverter. Excessive battery voltage also may damage the inverter.  
This damage is not covered by the warranty.  
Startup  
If steps are inapplicable, they can be omitted. However, it is highly recommended that all applicable  
steps be performed in the following order.  
If the results of any step do not match the description, see the Troubleshooting section on page 33.  
To start the system:  
1. Close the main DC circuit breakers (or connect the fuses) from the battery bank to the inverter.  
Repeat for every inverter present.  
2. Confirm that the MATE3 is operational, if present. (See the MATE3 Owner’s Manual for a  
description of the menu items that appear on a correctly functioning display.)  
3. Turn on the inverter using the MATE3 or external switch. Unlike previous OutBack inverters, this  
product’s default condition is Off.  
4. Using a DVM, verify 120 Vac between the L1 OUT and NEU terminals, and between the L2 OUT and  
NEU terminals. Verify 240 Vac between the L1 OUT and L2 OUT terminals. Do not turn on any AC  
circuit breakers at this time. (See page 33 for an illustration of AC test points.)  
5. Using the MATE3, perform all programming for input modes, stacking, battery charging, AC  
current, generator starting, and any other functions. Refer to the Input Modes section beginning  
on page 9 and the Functions section beginning on page 15. Also refer to the MATE3 Owner’s  
Manual and any other literature as needed.  
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Commissioning  
After programming (if any) is completed, perform the following steps:  
1. If other inverters are on the system, use a DVM to verify correct voltage from the L1 OUT terminal  
on one inverter to the next. When stacked in parallel, the wires from one inverter to the next  
should read 0 Vac (although individually they should still read 120 Vac with respect to neutral).  
Repeat for the L2 OUT terminal.  
2. Close the AC output circuit breakers. If AC bypass switches are present, place them in the normal  
(non-bypass) position. Do not connect an AC input source or close any AC input circuits.  
3. Use a DVM to verify correct voltage at the AC load panel.  
4. Connect a small AC load and test for proper functionality.  
5. Close the AC input circuit breakers and connect an AC source. Using a DVM, check the appropriate  
L1 and L2 IN terminals for 120 and 240 Vac. If a MATE3 system display is present, confirm that the  
inverter accepts the AC source as appropriate for its programming. Check the system display  
indicators for correct behavior.  
6. If the battery charger has been enabled, confirm that it is charging by using the MATE3. The  
inverter will perform a full battery charge when first powered up. This may take several hours. If  
restarted after a temporary shutdown, the inverter may skip most or all of the charging cycle.  
7. Test other functions which have been enabled, such as generator start, selling, or search mode.  
8. Compare the DVM’s readings with the MATE3 meter readings. If necessary, the system display’s  
readings can be calibrated to match the DVM more accurately. AC input voltage, AC output  
voltage, and battery voltage can be calibrated.  
Powering Down  
If steps are inapplicable, they can be omitted. However, it is highly recommended that all applicable  
steps be performed in the following order.  
To Power Down the System:  
1. Turn off all load circuits and AC input sources.  
2. Turn off all renewable energy circuits.  
3. Turn each inverter OFF using the MATE3 system display or external switch.  
4. Turn off the main DC overcurrent devices for each inverter.  
Adding New Devices  
When adding new devices to the system, first power down the system according to the preceding  
instructions. After adding new devices, perform another functional test, including programming.  
Firmware Updates  
Updates to the Radian’s internal programming are periodically available. If multiple inverters are used  
in a system, all units must be upgraded at the same time. See the MATE3 Owner’s Manual for details.  
IMPORTANT:  
All inverters will shut down during software updates. If it is necessary to run loads  
while updating the firmware, bypass the inverter with a maintenance bypass switch  
(if present). During this time, communication cables must remain connected and DC  
power must remain on. Lack of network communication will cause the update to fail  
and the inverter(s) may not work afterward. Inverters automatically update one at a  
time. Updating each inverter requires about 5 minutes.  
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Operation  
Input Modes  
The Radian inverter has two sets of input connections for multiple AC sources. (See the Radian Series  
Inverter/Charger Installation Manual for more information.) With the MATE3, each input can be  
programmed to a particular operating mode. Six modes are available, each with certain advantages  
which make it ideal for a particular application. Some modes contain functions unique to that mode.  
Both of the Radian’s inputs can be programmed for separate modes. The mode for the “Grid” input  
can be set in the  
menu. The second, “Gen”, input can be set in the  
Grid AC Input Mode and Limits  
menu.  
Gen AC Input Mode and Limits  
The input terminals are labeled for grid and generator due to common conventions, not  
NOTE:  
because of inverter requirements. Each input can accept any AC source as long as it meets the  
requirements of the Radian inverter and the selected input mode. If necessary, the  
accept grid power. The opposite is also true.  
terminals can  
Gen  
When multiple inverters are stacked together (see page 26), the master inverter’s input mode is  
imposed on all slave inverters. The slave menu settings are not changed; they retain any input mode  
that was previously programmed. However, the slave will ignore its own input mode and use that of  
the master. This also applies to any parameters in the mode menu (  
so on).  
,
, and  
Voltage Limit Connect Delay  
The following pages compare the various features of each input mode.  
Generator  
This mode allows the use of any generator, even one with a rough or imperfect AC waveform. In other  
modes, a “noisy” or irregular waveform may not be accepted by the inverter. This mode allows these  
waveforms to be accepted. The charging algorithm of this mode is designed to work well with any AC  
generator regardless of power quality or regulation mechanism. The generator must still comply with  
the inverter’s nominal input specifications in the Input section of this manual. See page 16.  
:
CHARGING  
In this mode, when the charger is enabled, the Radian will use the AC source to charge the battery  
bank. (See page 20.) It will proceed through the battery charging cycle until it reaches the Float stage.  
It will then remain in the Float stage and maintain the batteries for as long as the AC source is present.  
:
BENEFITS  
The Radian inverter will charge the batteries from the generator even when the generator is undersized, of  
low quality, or has other problems. The recommended parameters for sizing a generator are listed on  
page 18.  
In cases where utility grid power is unstable or unreliable,  
mode may allow the Radian inverter to  
Generator  
accept the power.  
This mode has a programmable delay time which will allow a generator to stabilize before connection. In the  
MATE3, this menu item is  
Gen AC Input Mode and Limits  
. It is available in either the  
Connect Delay  
or the  
Grid AC Input Mode and Limits  
menu, depending on which input is being programmed.  
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Operation  
:
NOTES  
The Support, Offset, and grid-interactive functions of the Radian are unavailable in this mode.  
Any AC fluctuations that are accepted by the inverter will be transferred to the output. The loads will be  
exposed to these fluctuations. It may not be advisable to install senstive loads under these conditions.  
In this mode, the Radian inverter’s maximum charge rate is limited to 20 Aac (80 Adc).  
While charging, the charger will not go silent (see page 22). After completing the charge, it will remain in the  
Float charging stage unless this generator is stopped (either automatically or manually) or AC input power is  
otherwise removed.  
Support  
This mode is intended for systems that use the utility grid or a generator. In some cases, the amount  
of current available from the source is limited due to size, wiring, or other reasons. If large loads need  
to be run, the Radian inverter augments (supports) the AC source, adding inverter and battery power  
to ensure that the loads receive the power they demand.  
In the MATE3 system display, the  
dictates the maximum AC draw for the Grid  
Grid Input AC Limit  
sets the maximum draw for the Gen input. This function takes effect if  
input. The  
Gen Input AC Limit  
the AC draw on the appropriate input exceeds its setting.  
:
CHARGING  
In this mode, when the charger is enabled, the Radian will use the AC source to charge the battery  
bank. (See page 20.) It will proceed through the entire battery charging cycle. After the end of the  
Float timer, it will continue to alternate between Silent and Re-Float stages.  
:
BENEFITS  
The large loads on the system can be powered while staying connected to the input, even if the input is  
limited. Battery power prevents overload of the input source, while at the same time limiting the amount of  
battery power used.  
In this mode, the inverter will offset the loads with excess renewable energy if it is available from the  
batteries. (See page 19 for more information on the Offset function.)  
This mode has a programmable delay time which will allow an AC source to stabilize before connection. In  
the MATE3, this menu item is  
. It is available in either the  
or  
Grid AC Input Mode and Limits  
Connect Delay  
menu, depending on which input is being programmed.  
the  
Gen AC Input Mode and Limits  
:
NOTES  
IMPORTANT:  
If the AC loads exceed the amperage limit setting, the inverter will draw energy from the  
batteries. If the loads are sustained, the batteries may discharge to the point of Low  
Battery Cut-Out and the inverter may shut down with a Low Battery error. (See pages 15  
and 39.) To prevent the loss of backup power, load use should be planned accordingly.  
The grid-interactive function of the Radian inverter is unavailable in this mode.  
Because the inverter limits the current draw from the AC source, it will reduce the charge rate as necessary to  
support the loads. If the loads equal the amperage setting, the charge rate will be zero.  
If the AC loads  
the amperage setting, the charger will begin operating in reverse. It will take power  
exceed  
the batteries and use it to support the incoming AC current.  
from  
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Operation  
Grid Tied  
IMPORTANT:  
Selling power to the utility company requires the authorization of the local  
electric jurisdiction. The method used by the local utility company to  
accommodate this will depend on their policies on this issue. Some may pay  
for power sold; others may issue credit. Some policies may prohibit the use of  
this mode altogether. Please check with the utility company and obtain their  
permission before using this mode.  
The Grid Tied mode allows the Radian inverter to become grid-interactive. This means that in addition  
to using power from the utility grid for charging and loads, it can also convert excess battery power  
and sell it to the utility grid. Excess battery power usually comes from renewable energy sources, such  
as PV arrays, hydroelectric turbines, and wind turbines.  
In this mode, the inverter will offset the loads with excess renewable energy if it is available from the  
batteries. (See page 19 for more information on the Offset function.) If additional energy is available  
beyond what is consumed by the loads, the energy will be sold to the utility grid.  
The grid-interactive function is referenced heavily in the Battery Charging section, as it is integrally  
tied with the battery charger. Where the charger draws power from the AC input and puts it into the  
batteries, the grid-interactive function removes power from the batteries (or the DC system) and  
returns it to the AC input. When a renewable source of energy raises the batteries above a designated  
reference point (or “target”), the inverter exports power in order to bring the voltage back down or to  
prevent it from rising further.  
The inverter uses several set points as targets for selling, particularly the battery charger settings. In the  
MATE3, the  
,
, and  
settings are all used as target voltages.  
Absorb Voltage Float Voltage  
Equalize Voltage  
If the battery charger is not active, the target voltage used by the Radian inverter is  
in the  
Sell Voltage  
menu. (See page 21 for more information on charging and selling. See the MATE3 Owner’s  
Grid-Tie Sell  
Manual to change any of these settings.)  
Unlike the other target voltages, the Radian inverter cannot import AC power to raise the batteries to the  
set point. It can only use excess DC power, if it is available, and export it as AC power.  
Sell Voltage  
:
CHARGING  
In this mode, when the charger is enabled, the Radian will use the AC source to charge the battery  
bank. (See page 20.) It will proceed through the entire battery charging cycle. After the end of the  
Float timer, it will continue to alternate between Silent and Re-Float stages, entering the Selling stage  
as appropriate.  
:
BENEFITS  
The most obvious advantage of this mode is the ability to return power to the utility grid.  
:
NOTES  
The Support function of the Radian inverter is unavailable in this mode.  
The inverter has a minimum five-minute delay before selling will begin. Upon initial connection to the utility  
grid, the inverter may be required to perform a full battery charge. This may delay the operation of the  
grid-interactive feature.  
The grid-interactive function only operates when excess DC (renewable) power is available.  
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Operation  
The grid-interactive function can only operate while the utility grid power is stable and within specific limits.  
If the AC voltage or frequency vary outside these limits, the inverter will stop selling. If the inverter  
stops selling, the MATE3 will show the reason. Sell Status messages are listed on page 43.  
If the AC voltage or frequency vary outside the maximum limits, the inverter will also disconnect from  
the utility grid. The Radian inverter’s grid-interactive limits are specified on page 46. The AC source  
acceptance limits are specified on page 17. These numbers are not necessarily the same.  
When power is returned to the utility grid, it may possible to make the utility meter run backwards. The net  
result would be to sell power to the utility company. However, this depends on whether there are other  
loads in the system. Loads on the main panel (not on the inverter’s output) may consume this power as fast  
as it is generated, preventing the meter from running backwards. In this case, the result of selling would be  
to reduce the consumption of AC power, not reverse it.  
The amount of power an inverter can sell is not equal to its specified output wattage. Its maximum selling  
output is 7.68 kW. However, output will vary with inverter temperature, battery type, and other conditions.  
A good guideline is that the renewable source should be sized to continuously deliver no more than  
85% of the inverter’s specified wattage (per inverter, in a multi-inverter system).  
This recommendation is specifically for the inverter’s grid-interactive feature. In some cases, the source  
may be sized larger to account for environmental conditions or the presence of DC loads. This depends  
on individual site requirements.  
UPS (Uninterruptible Power Supply)  
In the event of utility grid failure, UPS mode allows the inverter to switch to its inverting mode almost  
instantaneously. This allows the system to support sensitive AC loads without interruption.  
The transfer speed in this mode has been reduced so that if the AC input power is disconnected or a  
scheduled disconnect occurs, the transfer speed will be less than 4 milliseconds.  
:
CHARGING  
In this mode, when the charger is enabled, the Radian will use the AC source to charge the battery  
bank. (See page 20.) It will proceed through the entire battery charging cycle. After the end of the  
Float timer, it will continue to alternate between Silent and Re-Float stages.  
:
BENEFITS  
This mode will maintain constant power to the loads with virtually no drop in voltage or current.  
In this mode, the inverter will offset the loads with excess renewable energy if it is available from the  
batteries. (See page 19 for more information on the Offset function.)  
:
NOTES  
The Support and grid-interactive functions of the Radian inverter are unavailable in this mode.  
Due to the need for the Radian inverter to react quickly to AC source fluctuations, it must remain fully active  
at all times. The inverter requires a continuous consumption of 42 watts.  
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Operation  
Backup  
This mode is intended for systems that have utility grid available as the primary AC source. This  
source will pass through the Radian inverter’s transfer circuit and will power the loads unless utility  
power is lost. If utility grid power is lost, then the Radian inverter will supply energy to the loads from  
the battery bank. When the utility power returns, it will be used to power the loads again.  
:
CHARGING  
In this mode, when the charger is enabled, the Radian will use the AC source to charge the battery  
bank. (See page 20.) It will proceed through the entire battery charging cycle. After the end of the  
Float timer, it will continue to alternate between Silent and Re-Float stages.  
:
BENEFITS  
In this mode, the inverter will offset the loads with excess renewable energy if it is available from the  
batteries. (See page 19 for more information on the Offset function.)  
This mode will continuously maintain the batteries in a fully-charged state, unlike the Support mode, and  
does not have the overhead consumption of the UPS mode.  
:
NOTES  
The Support and grid-interactive functions of the Radian inverter are unavailable in this mode.  
Mini Grid  
The Radian inverter can be programmed to automatically reject an AC source and run solely from  
battery (and renewable) energy. In  
mode, the inverter only connects to the AC source  
Mini Grid  
(usually the utility grid) when the batteries run too low.  
In this mode, the Radian inverter runs on battery-supplied power for as long as the batteries can be  
sustained. It is expected that the batteries will also be charged from renewable sources such as PV.  
When the batteries become depleted, the system reconnects to the utility grid to operate the loads.  
The inverter will reconnect to the utility grid if the battery voltage decreases to either the  
Re-Float  
set point (see page 22), or the Rebulk voltage (see page 23). Once it reconnects to the utility  
Voltage  
grid, if the charger is turned off, the Radian will use its transfer circuit to send grid power to the loads.  
If the charger is turned on, it will use the grid to charge the battery, as well as powering the loads.  
While connected to the utility grid, any excess energy from the renewable source will be sent to the  
loads and used to “offset” the use of grid power. When the renewable energy is equal to or greater  
than the load demand, the utility grid will no longer be required. The Radian inverter will then  
disconnect from the utility grid and begin running from batteries again. It will not disconnect until  
these conditions are met.  
:
CHARGING  
In this mode, the Radian inverter will wait for the batteries to pass through the charging stages until  
certain internal charger settings are met (see below). This is true regardless of whether the Radian or  
the renewable source is charging. This means that the regulator for the renewable source must be set  
to the same settings as the Radian (or higher). See the MATE3 Owner’s Manual to locate the exact  
settings of the Radian inverter.  
If the reconnection was triggered by the  
set point, the inverter will only require the  
settings (as well as Offset.) The inverter  
Float Time  
Re-Float Voltage  
and  
batteries to pass through the  
Float Voltage  
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Operation  
will then enter Silent (see page 22) and continue repeating this part of the charging cycle until it  
disconnects from the utility grid.  
If the reconnection was triggered by the Rebulk voltage setting, the inverter will require the charger to  
pass through the entire charge cycle, including the  
Float Time  
,
,
, and  
Absorb Voltage Absorb Time Float Voltage  
settings (as well as Offset). The inverter will continue repeating the Float part of the  
charging cycle until it disconnects from the utility grid.  
See page 20 for more information on the battery charging cycle.  
:
BENEFITS  
mode allows a system to take full advantage of renewable energy. Dependence on the utility grid  
Mini Grid  
can be minimized or eliminated.  
In this mode, the inverter will offset the loads with excess renewable energy if it is available from the  
batteries. (See the previous page and page 19 for more information on the Offset function.)  
This mode is similar to to the high-battery transfer (HBX) mode used by the MATE3 system display, but it has  
several differences (see below).  
:
NOTES  
The Support and grid-interactive functions of the Radian inverter are unavailable in this mode.  
This mode has similar priorities to the high-battery transfer (HBX) mode used by the MATE3 system display.  
However, it is not compatible with HBX mode and cannot be used at the same time. When using  
mode, HBX mode should be disabled to prevent conflicts.  
Mini Grid  
When deciding whether to use  
mode or HBX, the user should consider various advantages of each.  
Mini Grid  
Mini Grid logic is based in the Radian inverter and can function in the absence of the MATE3. HBX logic  
is based in the MATE3 and cannot function unless the MATE3 is installed and operating.  
Mini Grid can use utility grid power to fully recharge the batteries on reconnection. HBX can only do so  
under specific circumstances.  
HBX set points have a wide range of settings. Mini Grid uses settings which tend to prevent the  
batteries from excessive discharge; however, most of its settings are automatic and do not allow  
customization.  
HBX works more efficiently when the renewable source is larger, but there is no specific requirement for  
renewable size. Mini Grid is unable to work properly unless the renewable source is larger than the size  
of the loads. (See previous page.) If this condition is not met, Mini Grid will not disconnect the inverter  
from the utility grid.  
HBX can be combined with the settings of any other Radian input mode (Generator, UPS, etc.). The  
Mini Grid input mode is naturally limited to its own settings and does not have access to certain  
functions of other modes. (See the first bullet above.)  
See page 32 and the MATE3 Owner’s Manual for more information on HBX.  
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Operation  
Functions  
The items in this section are states of operation common to all Radian inverters. These functions can  
be used in most or all of the input modes described in the preceding section. Some can be manually  
selected or enabled; others are automatic.  
All items identified as settable or adjustable have set points which can be accessed using the remote  
system display. (See the MATE3 Owner’s Manual for instructions on locating these set points.) The  
default settings and ranges of adjustment are listed beginning on page 47 of this manual.  
Inverting  
The Radian inverter converts DC voltage from batteries into AC voltage that is usable by AC  
appliances. It will continue to do this as long as the batteries have sufficient energy. The batteries can  
be supplied or recharged from other sources, such as solar, wind, or hydroelectric power.  
The inverter’s design uses two transformers and two high-frequency H-Bridge FET modules to achieve  
the required high-wattage output. When not in use, the dual design allows half the inverter to shut  
down for lower idle consumption.  
. Other sources may not maintain DC voltages  
The Radian inverter requires batteries to operate  
that are consistent enough for the inverter to operate reliably.  
CAUTION: Equipment Damage  
Do not substitute other DC sources in place of the batteries. High or irregular voltages  
may damage the inverter. It is normal to use other DC sources in conjunction with the  
batteries and the inverter, but not in place of the batteries.  
Certain features will affect the inverter’s operation. These features only operate when the inverter is  
generating AC power on its own. They do not function when the inverter is being supplied by an  
AC source.  
: This feature prevents the inverter from draining the batteries completely. It will stop  
Low Battery Cut-Out  
functioning and give a  
error when the DC voltage drops below a specified level for 5 minutes.  
Low Battery V  
This appears as an Event on the MATE3 system display, as described in the MATE3 Owner’s Manual. It is one of  
the Error messages described on page 39. This function is intended to protect both the batteries and the  
inverter’s output. (Continuing to invert on a low DC voltage may produce a distorted waveform.) This item is  
adjustable.  
: The recovery point from Low Battery Cut-Out. When the DC voltage rises above a  
specified level for 10 minutes, the low battery error will clear and the inverter will resume functioning. This  
item is adjustable.  
Low Battery Cut-In  
Connecting an AC source to charge the batteries will also clear a low battery error.  
: The inverter’s AC output voltage can be adjusted up or down by a certain amount, to allow  
Output Voltage  
for conditions. This item is adjustable.  
The inverter is also controlled by a high battery cut-out function. If the DC voltage rises above a specified  
level, the inverter will immediately stop functioning and give a error. This appears as an  
High Battery V  
Event on the MATE3 system display, as described in the MATE3 Owner’s Manual. This is one of the Error  
messages displayed on page 39 of this manual. (If the voltage drops below this point, the inverter  
automatically recovers.)  
For the standard GS8048 inverter, the high battery cut-out voltage is 68 volts. It cannot be changed.  
This function is intended to protect the inverter’s output and loads. Continuing to invert on a high DC  
voltage may produce a distorted waveform. Note that the inverter’s high battery cut-out does not alleviate  
or solve the high battery condition itself; the cause is an external condition.  
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Operation  
Search  
An automated search circuit is available to minimize the power draw when no loads are present.  
When enabled, the inverter does not always deliver full output. The output is reduced to brief pulses  
with a delay between them. These pulses are sent down the output lines to see if a resistance is  
present. Basically, the pulses “search” for a load. If a load is detected on either the L1 or L2 outputs,  
the inverter’s output increases to full voltage so that it can power the load. When the load is turned  
off, the inverter “goes to sleep” and begins searching again.  
The sensitivity of Search mode is in increments of approximately 0.1 Aac. The default is 6 increments,  
or about 0.6 Aac. A load which draws this amount or greater will “wake up” the inverter.  
Due to load characteristics, these increments are only approximate and may not function  
NOTE:  
exactly as listed.  
The pulse duration and the delay both have a time period that is measured in AC cycles. These two  
items and the load detection threshold are adjustable.  
Search mode may not be useful in larger systems with loads that require continuous power (e.g., clocks,  
answering machines, fax machines). Search mode may cause nuisance shutdowns, or it may sleep so rarely  
that there is no benefit.  
Some devices may not be easily detected by Search mode.  
Input  
When the Radian inverter input terminals are connected to a stable AC source, the inverter will  
synchronize itself with that source and use it as the primary source of AC power. (See AC Source  
Acceptance on page 17.) Its transfer relay will engage, linking the AC source directly with the  
inverter’s output. It can also use the source to charge batteries. (See Transfer on page 18 and Battery  
Charging on page 20.)  
Two sets of AC input terminals are available. Both inputs are identical and can be used for any AC source.  
However, for easy reference, the first input has been labeled GRID (for the utility grid). The second input is  
labeled GEN (for a generator). These designations are also used in the menus of the MATE3 system display.  
Each input has a separate set of input criteria and input modes. The programming for each input also has  
identical content.  
The independent inputs are intended to simplify the connection to multiple AC sources; however, only one  
input can be used at a time. If both inputs are powered, the default setting is for the inverter to accept the  
GRID input. This can be changed. In the MATE3 system display, these priorities are selected using  
Input  
in the  
menu.  
AC Input and Current Limit  
Priority  
Six input modes are available which affect the Radian inverter’s interactions with AC input sources. The  
mode allows the Radian to sell power using the input connection. The mode can use  
Grid Tied  
Support  
battery power to assist a smaller AC source. See page 9 for descriptions of these and other input modes.  
There are a number of considerations when selecting the type and size of an AC generator. (See the section  
entitled Generator on page 18.)  
The AC input current is used to power both loads and battery charging. The combined amount should not  
exceed the size of the AC overcurrent device or AC source. These devices should be sized appropriately  
during planning. (See AC Current Settings on the next page. See the Radian Series Inverter/Charger  
Installation Manual for more information.)  
The loads powered by the inverter  
exceed the size of the inverter’s transfer relay. (See the section  
must not  
entitled “Transfer” on page 18.)  
CAUTION: Equipment Damage  
Current draw in excess of the inverter’s transfer relay rating can damage the transfer  
relay. This damage is not covered by warranty.  
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Operation  
AC Current Settings  
The AC current settings control the amount of current that the inverter draws from the source(s). The  
amount of current is controlled by the grid or generator limit settings. These settings should be  
adjusted to match the size of the input circuit breaker. In the MATE3 system display, if the  
Inverter  
, the inverter uses the grid settings.  
or  
Input Priority AC Input and Current Limit  
menus are set to  
Grid  
, the inverter uses the generator settings.  
If the menus are set to  
Gen  
This is intended to protect a generator or source that may not be large enough to supply enough current for  
both charging and loads. If the combined charging and loads exceed this setting, the inverter will reduce its  
charge rate and give priority to the loads. If the loads exceed this number on their own, the charge rate will  
be reduced to zero.  
The  
input mode allows the Radian inverter to support the AC source with power from the batteries.  
Support  
See page 10.  
If multiple parallel inverters are installed with an AC source of limited amperage, the total combined  
amperage settings for all units must be less than the AC input circuit. The Configuration Wizard in the MATE3  
can perform this calculation. However, the inverters do not perform this calculation. If the MATE3 or the  
Configuration Wizard are not used, it is necessary to divide the input size by the number of inverters and  
assign an equal part of the amperage to each port.  
AC Source Acceptance  
The input source must meet the following specifications to be accepted:  
L1 (to neutral) 120 Vac, 12 Vac (default setting), and  
L2 (to neutral) 120 Vac, 12 Vac (default setting), and  
60 Hz, 6 Hz  
When these conditions are met, the inverter will close its transfer relay and accept the input source.  
This occurs after a delay which is specified below. If the conditions are not met, the inverter will not  
accept the source. If it was previously accepted and then rejected, the inverter will open the relay and  
return to inverting power from the batteries.  
The voltage limits can be adjusted to allow (or exclude) a source with weak or irregular voltages. These  
items are adjustable in the appropriate menu of the MATE3 (  
or  
Grid AC Input Mode and Limits Gen AC  
). The settings are titled  
Input Mode and Limits  
and . When this setting is  
Voltage Limit Lower  
Upper  
adjusted, it applies equally to L1 and L2.  
There can be side effects to changing the range of allowed voltages. See page 18.  
Each of the AC inputs has a settable connection delay. This is intended as a warmup period which allows  
an input source to stabilize before connection.  
The default setting for the Grid input is 0.2 minutes (12 seconds).  
The default setting for the Gen input is 0.5 minutes (30 seconds).  
These items are adjustable in the appropriate menu of the MATE3 (Grid AC Input Mode and Limits or Gen  
AC Input Mode and Limits).  
NOTES:  
Certain input modes uch as  
may prevent the inverter from accepting AC power even if electrical  
s
Mini Grid  
conditions are met. (See page 13.)  
Several items external to the inverter may prevent the inverter from accepting AC power even if electrical  
conditions are met. One is the High Battery Transfer mode, which is operated by the MATE3 system display.  
(See page 32 and the MATE3 Owner’s Manual.) Another is the MATE3’s  
hot key menu, which can  
AC INPUT  
. (See the MATE3 manual.)  
order all inverters to disconnect when set to  
Drop  
The inverter has additional criteria that control whether it sells power. The inverter may accept AC power but  
refuse to sell if the acceptance criteria are met, but the grid-interactive criteria are not. (See the  
input mode on page 11.)  
Grid Tied  
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Operation  
Generator  
A generator should be sized to provide enough power for all inverters, both for loads and for battery  
charging.  
It is usually recommended that the generator be sized at twice the wattage of the inverter system.  
Many generators may not be able to maintain AC voltage or frequency for long periods of time if they  
are loaded more than 80% of rated capacity.  
The generator is required to have a stable output before its power is accepted by the inverter. Some  
generators with less stable or uneven outputs may not be accepted. The use of the  
mode may assist with this problem.  
input  
Generator  
Transfer  
The inverter uses a transfer relay to alternate between the states of inverting and of accepting an AC  
source. Until the relay energizes, the L1 and L2 output terminals are electrically isolated from the  
input that is in use. When it closes, the L1 input and output terminals become electrically common.  
The same is true for the L2 input and output terminals. (The terminals for the unused input remain  
isolated during this time.) When the relay changes states, the physical transfer delay is approximately  
12 milliseconds (with the exception of the  
input mode).  
UPS  
The relay contacts are limited to 55 amps per phase or leg. The continuous loads on that output  
should never exceed this number. When connected to an AC source, the Radian inverter cannot limit  
the load current. An overload condition is possible.  
CAUTION: Equipment Damage  
Current draw in excess of the inverter’s transfer relay rating can damage the transfer  
relay. This damage is not covered by warranty.  
The inverter does not filter or clean up the power from the AC source. The voltage and power quality  
received by the output loads is the same as that of the source. If the voltage or quality do not meet  
the inverter’s input requirements (see page 17), it will disconnect and return to the inverting mode.  
If the AC source meets the inverter’s requirements but is irregular, any fluctuations will be transferred to the  
loads. If the loads are sensitive, it may be necessary to improve the quality of the AC source.  
To ensure a smoother transition, it may be advisable to raise the inverter’s lower acceptance limit. The  
default setting is 108 Vac on each leg. A higher setting will cause the inverter to transfer sooner in the event  
of a quality problem.  
The  
input mode is intended to accept irregular or unfiltered AC sources and is more likely to do so  
Generator  
than other modes. Since it will transfer the irregular power to the output as noted above, this should be  
considered before using this mode with sensitive loads. (See page 9.)  
In a stacked system, slaves are ordered to transfer at the same time as the master. If a slave does not  
sense an AC source at the same time as the master, it will continue inverting, and will experience a  
error (see page 39). This appears as an Event on the MATE3 system display, as described  
Phase Loss  
in the MATE3 Owner’s Manual.  
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Operation  
Offset  
This function is designed to use excess battery energy to power the loads, even when an AC source is  
present. This allows the system to take advantage of renewable energy sources, in effect “offsetting”  
dependence on the AC source.  
When a renewable source of energy raises the batteries above a designated reference point (or  
“target”), the inverter exports power to the loads in order to bring the voltage back down or to  
prevent it from rising further.  
The inverter uses several set points as targets for the offset function, particularly the battery charger  
settings. In the MATE3, the  
,
, and  
settings are all used  
Equalize Voltage  
Absorb Voltage Float Voltage  
as reference voltages. While the battery charger is operating, it will regulate the voltage at a level  
appropriate for the target setting.  
If none of the battery charger’s timers are active, the target voltage used by the Radian inverter is  
in the  
menu. Unlike the other target voltages, the Radian inverter cannot  
Grid-Tie Sell  
Sell Voltage  
import AC power to raise the batteries to the  
if it is available, and export it as AC power.  
set point. It can only use excess DC power,  
Sell Voltage  
(See page 21 for more information on how Offset relates to the battery charger. See the MATE3  
Owner’s Manual to change any of these settings.)  
:
NOTES  
If the Radian inverter is in the  
input mode and more renewable energy is available than can be  
Grid Tied  
offset by the loads, the inverter will sell the remainder to the utility grid. Although the inverter can use the  
setting as a target in most input modes (see below), it is unable to sell power to the utility grid  
Sell Voltage  
unless the  
mode is selected.  
Grid Tied  
If the inverter is in the  
,
,
, or  
input modes and more renewable energy is  
Mini Grid  
Support UPS Backup  
available than can be offset by the loads, it means the inverter is capable of running all of its loads using  
renewable energy. The inverter will disconnect from the AC source as long as the excess renewable energy  
is present.  
The Offset function is not active when the  
input mode is selected.  
Generator  
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Operation  
Battery Charging  
IMPORTANT:  
Battery charger settings need to be correct for a given battery type. Always follow  
battery manufacturer recommendations. Making incorrect settings, or leaving them at  
factory default settings, may cause the batteries to be undercharged or overcharged.  
The inverter uses a “three-stage” battery charging process. The three stages are Bulk, Absorption, and  
Float. These stages follow a series of steps, which are shown on graphs (see page 21).  
:
NOTES  
The process shown in Figure 3 also includes the step of selling power back to the utility, as this is integrally  
tied with the battery charger. This step, and Figure 3, are only applicable when the Radian inverter is in the  
input mode.  
Grid Tied  
The process shown in Figure 4 eliminates Silent, Float Timer, and other parts of the process. Figure 4 is only  
applicable when the Radian inverter is in the input mode.  
Generator  
The target points and time limits cited under various steps are also used by the inverter’s Offset function.  
(See page 19.) These items are settable using the MATE3 system display. (See the MATE3 Owner’s Manual.)  
Charging Steps  
No Charging  
If the inverter is not charging, any of the following conditions may apply:  
The unit is inverting or not connected to a qualified AC source.  
The unit is connected to an AC source but is in a mode or stage that does not use the charger. (Silent mode is  
one example.)  
The unit is connected to an AC source but the charger has been turned off.  
Bulk Stage  
This stage activates the charger. This is the first stage in the three-stage charge cycle. It is a  
constant-current stage which drives the battery voltage up. This stage typically leaves the batteries at  
75% – 90% of their capacity, depending on conditions.  
setting. The default setting is 57.6 Vdc.  
Target point: Absorb Voltage  
The initial DC current is the maximum current the charger can deliver. It will begin at the charger’s  
specified maximum, but will gradually decrease as the voltage increases. This is a tradeoff in wattage  
and is normal for the charger.  
Absorption Stage  
This is the second stage of charging. It is a constant-voltage stage. Current varies as needed to  
maintain the voltage, but will typically decrease to a very low number over time. This “tops off the  
tank”, leaving the batteries at essentially 100% of capacity.  
setting.  
Target point: Absorb Voltage  
setting. This timer counts down from the inception of the Absorption stage  
Time limit: Absorb Time  
until it reaches zero. The timer can be viewed. (See the MATE3 manual.)  
For multiple inverters only:  
The charging of multiple stacked inverters is synchronized and is governed by the master. When the  
master inverter reaches the end of Absorption (and other stages), the slaves will exit Absorption as  
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Operation  
Voltage  
Absorption Set Point  
Absorption  
Float Set Point  
Sell Set Point  
Float Timer  
Offset  
Offset  
Re-Float Set Point  
Float  
Silent  
Silent  
Bulk  
No  
Charge  
Time  
1
Figure 3 Charging Stages Over Time  
Voltage  
Absorption Set Point  
Absorption  
Float Set Point  
Float  
Bulk  
No  
No Charge  
Charge  
Time  
1
Figure 4 Charging Stages Over Time (Generator mode)  
well, even if their timers have not expired. The remaining time for the slaves will be retained in the  
timer for each inverter.  
The Absorption timer does not reset to zero when AC power is disconnected or reconnected. It only  
resets to zero if it runs out, or if an external STOP BULK command is sent. The rest of the time, it retains  
any remaining time. It adds more time to the Absorption period whenever the batteries fall below a  
certain voltage. (See page 23 for more information on how the timer works.)  
Offset  
This is not a charging stage. The Offset function is designed to use excess battery energy to power the  
loads, even when an AC source is present. Offset can operate in any stage of charging, but is shown in  
Figure 3 to display the function when no charging stages or timers are active. This function is  
described more fully on page 19.  
Offset is a constant-voltage mode of operation. The inverter cannot import current to charge the  
batteries to a target voltage, but it can export any excess current to constantly hold them at this value.  
The target voltage used when no other stages are active, as shown in Figure 3, is the  
Sell Voltage  
setting. (Excess current typically comes into the batteries from a PV array, wind turbine, or similar  
renewable energy source.)  
setting. The default setting is 52.0 Vdc.  
Target point: Sell Voltage  
1The points where the dark blue line intersects the vertical dotted line indicate a change from one step to the next. The  
points where they also intersect with a horizontal dotted line indicate that the charger has switched to a new target voltage.  
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Operation  
This setting is typically lower than the Float voltage setting. Although the batteries are not  
discharged, they are maintained at a somewhat lower voltage so that the maximum amount of power  
can be exported. It is recommended that this item be set at the batteries’ natural rest voltage.  
In the  
input mode, excess power is sent first to any loads on the inverter’s output, using the  
Grid Tied  
Offset function (see page 19). If the exported power exceeds the load requirements, the excess is sold  
back to the utility grid, using the inverter’s AC input terminals. The unit will maintain this activity for  
as long as excess power is available. See page 11 for more notes on the  
input mode.  
Grid Tied  
Regardless of the input mode setting, if no renewable energy is present, the inverter will exit (or skip)  
this step and enter Silent.  
Silent  
This is not a charging stage, but a quiescent period between stages. The inverter remains on the AC  
source, but the charger is inactive. It enters this condition upon completing the Absorption stage and  
concluding (or skipping) Offset operation.  
In Silent, the batteries are not in significant use by the inverter, but they are also not being charged.  
The battery voltage will naturally decrease when not maintained by another means such as a  
renewable source.  
The term “Silent” is also used in the context of stacking inverters and Power Save levels. See page 28.  
setting. When the battery voltage decreases to this point, the  
Target point: Re-Float Voltage  
charger becomes active again. The default set point is 50.0 Vdc.  
If the Radian inverter is placed in the input mode, the charger skips Silent and  
NOTE:  
Generator  
proceeds directly to Float stage (see Figure 4 on page 21). It will remain in Float until AC power is  
disconnected, which usually means that the generator was stopped manually or automatically.  
See page 9 for more information on this mode.  
Float Stage  
This is the third stage of charging. It is a constant-voltage stage. Current varies as needed to maintain  
the voltage, but typically drops to a low number. This stage offsets the batteries’ tendency to  
self-discharge (as well as offsetting the draw of any other DC loads), and maintains them at 100% of  
capacity.  
setting. The default set point is 54.4 Vdc.  
Target point: Float Voltage  
setting.  
Time limit: Float Time  
The remaining stages below do not apply in the  
input mode. The next activity that  
Generator  
NOTE:  
can occur is a new charging cycle. The criteria for beginning a new cycle are described on page 23.  
Float Timer  
This is part of Float stage and is not a separate stage of charging. On the charts on page 21, it is  
marked as a separate step to note that the timer only begins running upon reaching the Float set  
point. It does  
begin running at the beginning of Float stage. (The Float timer is reset to its  
not  
maximum amount whenever the batteries drop to the Re-Float voltage.)  
Repeated Silent  
The unit re-enters the Silent stage as it did previously. The unit remains on the AC source, but the  
charger is inactive.  
setting. The default set point is 50.0 Vdc.  
Target point: Re-Float Voltage  
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Operation  
The unit will continue cycling between Float and Silent for as long as the AC source is present.  
However, if excess DC power is available and the battery voltage rises above the  
point, the unit can resume Offset activity as described on page 21.  
set  
Sell Voltage  
The unit can only enter Offset when none of the timers are active. If any of the timers have accumulated  
time while in Silent, the unit will enter the highest stage with accumulated time and proceed from  
that point.  
Voltage  
Absorption  
Absorption  
Absorption Set Point  
Float Set Point  
Float  
Sell Set Point  
Timer  
Offset  
Offset  
Refloat Set Point  
Rebulk Point  
Float  
Silent  
AC Loss  
Bulk  
No  
Bulk  
Charge  
Time  
Figure 5 Repeated Charging Cycles  
New Charging Cycle  
If the AC source is lost or disconnected, the unit will return to inverting mode if enabled. The battery  
voltage will begin to decrease due to loads or natural loss. When the AC source is restored, the  
inverter will return to the charging cycle. If the batteries drop below the Rebulk voltage (see below),  
the inverter will restart the cycle, beginning at Bulk stage. If the batteries do not drop below Rebulk,  
the charger will not enter the Bulk stage and will return to its previous stage.  
New Absorption Stage  
When entering the second stage, Absorption, the charger will not necessarily run through its full  
duration. The timer will count down whatever time remains from the previous cycle, or whatever time  
it has accumulated since then.  
Absorption Timer  
The Absorption timer does not reset to its maximum like the Float timer does. Instead, the timer  
counts upward (gaining time) whenever the battery voltage drops below the Rebulk point. This  
means that the Absorption period may not always be the same, depending on how much time it  
has acquired.  
The Rebulk voltage is 48.8 Vdc. This is a fixed setting and cannot be changed. For as long as the  
inverter remains below this voltage, the Absorption timer will gain an equal amount of time. This  
dictates the duration of the Absorption stage. Note that in Figure 5, the duration of time spent below  
the Rebulk voltage is the same as the subsequent Absorption period (as shown by the small arrows).  
If the battery voltage drops below 48.0 Vdc, the timer increments (counts upward) at double the  
normal rate. For example, if the batteries spent 8 minutes below this voltage, 16 minutes would be  
added to the Absorption timer. Similarly, if the battery voltage drops below 47.2 Vdc, the timer  
increments at quadruple the normal rate.  
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Operation  
The Absorption timer continues this behavior even if the charger is still on. For example, if the charger  
is in Float stage and there is a significant battery drain, the charger may not be able to maintain the  
batteries at the Float voltage. Once the batteries fall below the Rebulk point, the Absorption timer will  
begin accumulating time. (However, the accumulation will be minor, as this will also cause the  
charger to re-enter the Bulk stage.)  
The timer will stop incrementing when it reaches the  
setting. This is the maximum  
Absorb Time  
duration of the Absorption stage. This means that regardless of the voltage, the timer will always run  
for the full Absorption period if the batteries dropped below the appropriate voltage for that amount  
of time. If significant battery drain caused the batteries to drop below the set points for doubling or  
quadrupling the rate, the charger may run for the full Absorption period even after a lesser amount  
of time.  
The rest of the charging stages will proceed as described on the previous few pages.  
Equalization  
Equalization is a controlled overcharge that is part of regular battery maintenance. Equalization  
brings the batteries to a much higher voltage than usual and maintains this high voltage for a period  
of time. This has the result of removing inert compounds from the battery plates, and reducing  
stratification in the electrolyte.  
Equalization follows the same pattern as standard three-stage charging, as shown in the figures on  
page 21. However, instead of the Absorption voltage and time set points, it is controlled by the  
and  
settings in the MATE3.  
Equalize Time  
Equalize Voltage  
This process must be started manually using the MATE3. The inverter cannot be programmed for  
automatic battery equalization. This is a safety measure.  
Equalization is normally performed only on flooded lead-acid batteries. The schedule for equalization  
varies with battery use and type, but it is usually performed every few months. If performed correctly,  
this process can extend battery life by a considerable amount.  
Equalization is not normally performed on nickel-technology batteries or any sort of sealed battery.  
CAUTION: Battery Damage  
Do not equalize any sealed battery types (VRLA, AGM, Gel, or other) unless  
approved by the manufacturer. Some batteries may suffer severe damage  
from equalization.  
Contact the battery manufacturer for recommendations on equalization  
voltage, duration, schedule, and/or advisability. Always follow  
manufacturer recommendations for equalization.  
Battery Temperature Compensation  
Temperature compensation is a process that corrects for changes in battery performance caused by  
varying temperature.  
When batteries are cooler than room temperature (77°F or 25°C), the electrolyte reaction slows down.  
This causes the battery to accept charging energy less readily. Delivering the usual amount of energy  
that would fully recharge a battery at room temperature will undercharge a cool one.  
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Operation  
Conversely, when batteries are warmer than room temperature, the electrolyte reaction is somewhat  
hyper-reactive. It takes less energy than usual to charge them. Delivering the full (room-temperature)  
amount of energy would overcharge them and can be hard on them over time.  
The Radian inverter, when equipped with the Remote Temperature Sensor (RTS) will compensate for  
changes in temperature. The RTS is attached to a single battery near the center of the bank, to achieve  
a representative temperature. If installed in a multiple-inverter system, only a single RTS is necessary.  
It must be plugged into the master inverter and will control the charging of all slaves and all charge  
controllers. (See the Radian Series Inverter/Charger Installation Manual for locating the RTS port.) This  
process is automatic.  
When charging, an inverter system with an RTS will increase or decrease the charge voltage by 5 mV  
per degree Celsius per battery cell. This setting affects the Absorption, Float, and Equalization set  
points. The Sell Voltage and Re-Float Voltage set points are not temperature compensated. The  
Equalization set points are not compensated in OutBack charge controllers.  
In a 48 Vdc system (24 cells, 2 volts each), this means 0.12 volts per degree Celsius above or below 25°C.  
Maximum compensation is 2.4 Vdc.  
EXAMPLES:  
A 48 Vdc system with batteries at 15°C will compensate its charging to 1.2 Vdc  
A 48 Vdc system with batteries at 40°C will compensate its charging to 1.8 Vdc  
than the set points.  
higher  
than the set points.  
lower  
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Operation  
Multiple-Inverter Installations (Stacking)  
Multiple inverters in a single system can support larger loads than a single inverter can handle.  
Installing inverters in this configuration is called “stacking”. Stacking inverters does not refer to  
physically placing one on top of another. It refers to how they are wired within the system and then  
programmed to coordinate activity. Stacking allows all units to work together as one system.  
The Radian inverter can be stacked in parallel to increase capacity. Up to ten units can be stacked to  
operate in a single system. Each inverter is programmed to operate at certain times.  
Stacking requires an OutBack HUB product, as well as a MATE3 system display (sold separately). A  
system of four or fewer units may use the HUB4. Systems of up to ten units require the HUB10. All  
interconnections are made using CAT5 non-crossover cable. (See the Radian SeriesInverter/Charger  
Installation Manual for more stacking instructions.)  
Each inverter needs to be assigned a status — “master” or “slave”. The master is the primary and most  
heavily used unit. Slave inverters provide assistance when the loads are more than the master can  
handle alone. Programming involves using the MATE3 to assign a status and stacking value to the  
inverter on each port. See the MATE3 and HUB manuals for programming instructions.  
HUB4  
Additional Ports  
Port 1  
MATE Port  
MATE3  
Figure 6 OutBack HUB4 and MATE3  
IMPORTANT:  
The master inverter must always be connected to port 1 on the HUB. Connecting  
it elsewhere, or connecting a slave to port 1, will result in backfeed or output  
voltage errors which will shut the system down immediately.  
Installing multiple inverters without stacking them (or stacking them incorrectly)  
will result in similar errors and shutdown.  
Although stacking allows greater capacity, the loads, wiring, and overcurrent  
devices must still be sized appropriately. Additional terminations and bus bars  
may be required. Overloading may cause circuit breakers to open or the inverters  
to shut down.  
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Operation  
In parallel stacking, two or more inverters are stacked to create a single, common 120/240 Vac bus.  
The master provides the primary output. The slaves are connected to the same output and assist the master.  
The slave inverters can be programmed to activate on demand, reducing idle-power consumption. They will  
remain off until the loads exceed a certain threshold.  
A two-inverter system can continuously power 16 kVA of loads.  
Up to ten inverters may be installed in a parallel arrangement.  
24 kVA  
120/240 Vac  
8 kVA  
120/240 Vac  
8 kVA  
120/240 Vac  
8 kVA  
120/240 Vac  
Figure 7 Example of Parallel Stacking Arrangement (Three Inverters)  
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Operation  
Power Save Levels  
Each inverter consumes approximately 30 watts of idle power while it remains on, even if it is not  
actively inverting or charging. The Power Save function allows the option to put some or all slave  
inverters into a quiescent state known as Silent mode. This mode minimizes the inverter’s idle  
consumption. The inverters will come on again when the loads require power. (The term “Silent” is  
also used in the context of battery charging. See page 22.)  
The master inverter remains active unless specifically ordered to turn off. It does not enter Silent mode.  
When the majority of the inverter’s wattage is consumed by loads, the master turns on one or more slaves  
for assistance. When the load drops back to a lesser wattage (as detected by the master), the slaves return  
to Silent mode.  
The order in which slaves turn on (or return to Silent mode) is controlled by programming in the MATE3. The  
slaves are given a “rank”, or level number. The lower the number, the sooner a slave will be turned on.  
IMPORTANT:  
It is highly recommended to use the MATE3 Configuration Wizard to set up this function.  
It is essential to set the slave Power Save Levels in sequential order. Failure to set them  
up correctly will cause erratic system behavior. The Configuration Wizard automatically  
programs the correct priorities. (See the MATE3 Owner’s Manual.)  
If it is necessary to set these items manually:  
In the MATE3 system display, the  
screen contains two  
menu  
Power Save Level  
Inverter Stacking  
. Both items have a settable range of values. (See the MATE3  
items. These are  
and  
Slave  
Master  
manual for more information.)  
The first item,  
, must only be used when port P01 is selected with the  
Master Power Save Level  
<PORT>  
navigation key. This should be the master inverter. Although the item is still visible when other (slave) ports  
are available, it should not be programmed when other ports are selected. The range of rank numbers is  
0 to 31. The default value is 0. The master is normally left at this value.  
The second item,  
, must only be used when ports other than P01 are selected.  
Slave Power Save Level  
Although the item is still visible when the P01 (master) port is selected, it should not be programmed for  
P01. The range of rank numbers is 1 to 31. The default value for all ports is 1.  
The ranks are prioritized so that lower-numbered ranks turn on sooner and higher ranks turn on later. The  
lowest-ranked unit will not go silent and will remain on unless ordered otherwise. The lowest-ranked unit is  
expected to be the master. The priorities are the same across both screens; thus, if P01 (master) is set at 0  
and P02 (slave) is set at 1, the slave will turn on later. Since the  
item is the only one that goes to 0, it  
Master  
is easy to ensure that all other units besides the master go silent.  
Leaving the master at 0  
It is highly recommended to rank the slave inverters in order (1, 2, 3, 4, etc.).  
automatically makes 4 kW of power instantly available (from the master). If a slave is prioritized higher than  
the master (by raising the master level to 2 and the slave to 1, for example), that slave will not go silent. This  
will keep the power save mode from functioning. In general, setting the number higher than 0 will activate  
an additional 4 kW of power for every increment. If the slave settings have not been programmed correctly,  
the master may override them and begin turning on unnecessary slaves. This defeats the purpose of the  
Power Save feature.  
It is also recommended that slaves do not share rank numbers. If, for example, multiple slaves were all  
ranked at 1, they would all come on at the same time. Once they came on, the divided load would cause the  
master to detect a minimal load on its output, so it would shut off all the slaves, at which point the master  
would read a high load again. This could quickly escalate into a rapid on/off cycling of inverters and could  
cause long-term system problems.  
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Operation  
Auxiliary Terminals  
The Radian inverter has two sets of terminals which can respond to different criteria and control many  
functions. The 12V AUX terminals provide a 12 Vdc output that can deliver up to 0.7 Adc to control  
external loads. The RELAY AUX terminals are “dry” relay contacts with no voltage. Each set of  
terminals has its own set of programmed criteria. Each has identical options available. (When the  
options described below refer generically to the “AUX output”, it can mean either set of terminals.)  
Each AUX output has three states available: continuous  
, continuous , and  
Off On  
, which allows  
Auto  
that output to be activated using the automatic auxiliary functions. (All functions on both sets of  
terminals are defaulted to .) These functions are based in the Radian inverter and accessed using  
Off  
the MATE3. The MATE3 and other devices also have programming, such as AGS, that can control the  
AUX outputs. To avoid conflicts, the output should be turned  
(See page 32.)  
when the AGS function is active.  
Off  
For the Radian automatic functions, typical applications include signaling a generator to start, sending  
a fault alarm signal, or running a small fan to ventilate the batteries. See the Radian Series  
Inverter/Charger Installation Manual for more information on hooking up each set of terminals. See the  
MATE3 Owner’s Manual for instructions on programming each function.  
The AUX terminals have a series of set points which are used by various functions. Both sets of  
terminals have the same options available, but they are programmed independently. Not all set  
points are used by all functions. Each AUX mode description below will detail the set points that are  
used for that mode.  
Low DC voltage settings  
High DC voltage settings  
On delay settings, in increments of 0.1 minutes  
Off delay settings, in increments of 0.1 minutes  
There are nine functions, each geared toward a different application. The first item on this list may not  
be the default function displayed in either menu.  
can perform load management. When battery voltage rises above a settable high voltage level,  
Load Shed  
the AUX output is activated after a settable delay. The AUX output is used to energize a relay, which is  
connected to non-vital loads. The AUX output will be deactivated once the battery voltage falls below a low  
voltage setting for a settable delay period.  
will turn off when the inverter enters a high-temperature condition or when the AC output  
Load Shed  
voltage drops below 105 Vac for more than three seconds. It will also turn off if the input current exceeds the  
setting while the inverter is using an AC source.  
Input AC Limit  
Parameters include:  
Low and high DC voltage  
On and off delay  
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Operation  
is used as a controller for an AC generator with a remote start feature, although it has limited  
Gen Alert  
functionality. (The generator recharges batteries using the inverter’s battery charger.) When the battery  
voltage falls to a low set point for a settable delay, the AUX output is activated. The AUX output is used to  
energize a relay. The relay contacts then activate the remote start/stop circuit on the generator. This is  
illustrated in the Radian Series Inverter/Charger Installation Manual.) The AUX output will be deactivated once  
the battery voltage rises to a high voltage setting for a settable delay period.  
Parameters include:  
Low and high DC voltage  
On and off delay  
Gen Alert control logic is located in the inverter. It has the advantage of functioning when the system  
display is removed. However, it may not completely charge the batteries and does not have all the  
advantages of the Advanced Generator Start (AGS) feature that is found in the system display. For many  
users, the AGS feature may prove more useful than Gen Alert. Gen Alert, however, could be used as a literal  
“Generator Alert”, a signal to the user to manually start a generator.  
enables the AUX output when the inverter shuts down due to an error condition (see page 39). It can  
activate a light or alarm to show that the inverter has failed. With the appropriate devices, it could send an  
alarm signal through a radio, pager, or telephone dialer.  
Fault  
This function does not have settable parameters.  
This function is not triggered by the Phase Loss error, as that error does not shut down the inverter.  
enables the AUX output in response to a high DC (battery) voltage set point. It can run a small fan  
Vent Fan  
to ventilate the battery compartment to eliminate gases that result from battery charging. When the  
voltage falls below this set point for a settable delay period, the AUX output turns off.  
Parameters include:  
High DC voltage  
Off delay  
enables the AUX output when the inverter reaches a high internal temperature. It is intended to  
trigger a small external fan for additional cooling. See the Warning Troubleshooting table on page 40 for a  
description of the fan criteria.  
Cool Fan  
This function does not have settable parameters.  
enables the AUX output to divert excess renewable energy to a DC load, such as a resistor, a  
DC Divert  
heater, or a fuel cell. When battery voltage rises above a settable high voltage level, the AUX output is  
activated after a settable delay. The AUX output controls a larger relay, which allows current to flow from the  
batteries to a dedicated DC load when energized. (This is illustrated in the Radian Series Inverter/Charger  
Installation Manual.) Diversion is activated by high DC voltage and is usually used to regulate battery  
charging. The resistor must be sized to dissipate all of the energy from the renewable source if necessary.  
Diversion will turn off following a delay when a low DC voltage setting is reached.  
Parameters include:  
Low and high DC voltage  
On and off delay  
enables the AUX function as an alert that the utility grid does not meet IEEE parameters for the  
IEEE  
grid-interactive function (see page 46). It can activate a light or alarm to show that the grid-interactive  
function has shut down and that there may be problems with the grid. The AUX output will cycle on and off  
if IEEE parameters are met and the IEEE timer is counting down.  
This function does not have settable parameters.  
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Operation  
enables the AUX output whenever the inverter accepts an AC source. It can activate a light or  
alarm to show that the utility grid is present or that a generator has started. Alternately, it could be used to  
show that the source has disconnected.  
Source Status  
This function does not have settable parameters.  
enables the AUX output to divert excess renewable energy to an AC load, usually an AC device  
AC Divert  
powered by the inverter itself. When battery voltage rises above a settable high voltage level, the AUX  
output is activated after a settable delay. The AUX output controls a larger relay, which allows current to flow  
from the batteries to a dedicated AC load when energized. Diversion is activated by high DC voltage  
following a delay. This function is usually used to regulate battery charging. The AC device is usually wired  
to the output or load panel and must be left on. It must be sized to dissipate all of the energy from the  
renewable source if necessary. Diversion will turn off following a delay when a low DC voltage setting is  
reached.  
The AUX output will automatically turn on to run the loads if the inverter accepts an AC source.  
Parameters include:  
Low and high DC voltage  
On and off delay  
During variable conditions, the AUX output is triggered no more than once per minute (if voltage conditions  
are still met). This prevents rapid nuisance cycling of the AC load in the event of rapidly changing  
conditions.  
AC Divert should not be used as the sole source of battery regulation. If the inverter shuts down or fails, the  
batteries could suffer severe damage. This function should be supported by an external regulator.  
If the inverter shuts down due to overload, the AUX output will also shut down. If the inverter load  
exceeds 30 Aac, the AUX output will turn off to prevent an overload condition.  
If either the FETs or the capacitors (see page 40) become too hot, the AUX will turn off due to  
diminished inverter wattage capacity.  
Note that even if every function in the menu is set to  
external function such as AGS (see page 32).  
, the AUX output may still be triggered by an  
Off  
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Operation  
System Display-Based Functions  
Advanced Generator Start (AGS)  
As noted under the  
feature (see page 31), the system is capable of starting a generator.  
Gen Alert  
simply starts and stops the generator based on battery voltage. For more advanced control,  
Gen Alert  
the inverter system can use the Advanced Generator Start (AGS) feature, which runs through the  
entire three-stage charging cycle. It can start according to battery voltage, inverter load, time of day,  
and other criteria. It has a quiet time feature which restricts the generator from starting at  
inconvenient times. Additional features are also available.  
Because this is an advanced function with capabilities beyond the inverter’s  
, the control  
Gen Alert  
logic for AGS is based in the MATE3 system display, not the inverter. See the MATE3 Owner’s Manual  
for more information on programming and using the AGS mode.  
High Battery Transfer  
In High Battery Transfer mode, the system is connected to an AC source such as the utility grid;  
however, it will use battery power as the first priority. The AC source is locked out until needed.  
In this mode, the system runs on battery-supplied power for as long as the batteries can be sustained.  
It is expected that the system will be supplied by renewable sources such as PV power. When the  
batteries become depleted, the system reconnects to the AC source to operate the loads.  
The batteries may be recharged during this time using the renewable source. When the batteries are  
recharged to a high enough voltage, the system transfers back to the batteries as the primary source  
(hence the name High Battery Transfer).  
The inverter’s charger should be off. High Battery Transfer mode is intended to use only the  
NOTE:  
renewable source for charging batteries. Renewable charging is the motivator for returning to battery  
(and renewable) operation. Use of the inverter’s charger interferes with this priority. It also may not  
charge effectively.  
This mode has similar priorities to the  
input mode contained within the Radian inverter.  
Mini Grid  
Either mode may achieve similar results, but they are not identical. See page 14 for the advantages  
and disadvantages of each mode.  
Because this is a system-wide function and not a function of individual inverters, the control logic for  
High Battery Transfer is based in the MATE3 system display. See the MATE3 Owner’s Manual for more  
information.  
Grid Use Time  
The inverter system is capable of connecting to, or disconnecting from, the utility grid based on time  
of day. It can also be programmed to connect at different times on weekdays and on weekends.  
Because this is a system-wide function and not a function of individual inverters, the control logic for  
Grid Use Time is based in the MATE3 system display. See the MATE3 Owner’s Manual for more  
information.  
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Troubleshooting  
Basic Troubleshooting  
Table 2 is organized in order of common symptoms, with a series of possible causes. Each possible  
cause also shows possible troubleshooting remedies, including system display checks where  
appropriate.  
In troubleshooting, AC  
voltages can be measured  
at this series of test points  
using a narrow probe  
Figure 8 AC Test Points  
Table 2  
Possible Cause  
Troubleshooting  
Possible Remedy  
Symptom  
No DC Voltage.  
Use a DC voltmeter to check the voltage directly on the DC  
terminals. If not present, the problem is external. If present, the  
inverter could be damaged. Contact OutBack Technical Support  
(see inside front cover of this manual).  
Jumper J3 missing.  
See the Installation Manual for the location of J3. Confirm the  
jumper is present. If missing, replace the jumper. Or follow the  
Installation Manual instructions to install an external switch.  
No AC output  
(will not invert).  
Unit defaulted off  
(No MATE3 present; initial  
install; J3 confirmed present).  
The Radian inverter is given an initial OFF command in the  
factory. With DC present, use narrow pliers to remove jumper J3  
from its pins. Once removed, install it again. This is the  
equivalent of “jiggling the switch.”  
INVERTER  
hot key.  
Inverter set to  
.
MATE3 system display only: Set to  
with the  
Off  
On  
Inverter set to  
mode).  
(Search  
MATE3 system display only: If constant power is required, set to  
Search  
On  
INVERTER  
with the  
hot key. (If this setting was intentional, then  
no action is required.)  
One or more  
Unit is slave and is in Power  
Save mode.  
MATE3 system display only: Check Power Save levels in the  
menu and test with loads. Determine if the  
inverter comes on at the appropriate levels. (If this setting was  
intentional, then no action is required.)  
inverters will not  
invert while others  
do (in multi-inverter  
system).  
Inverter Stacking  
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Troubleshooting  
Table 2  
Possible Cause  
Troubleshooting  
Possible Remedy  
Symptom  
No AC input.  
Check the AC voltage on the inverter’s input test points. (See  
page 33.) If not present, the problem is external. If present, the  
inverter could be damaged. Contact OutBack Technical Support  
(see inside front cover of this manual).  
AC input not connected on  
both L1 and L2.  
Check the AC voltage on the inverter’s input test points. (See  
page 33.) Both L1 and L2 must have voltage. The inverter will not  
accept an input from only one leg.  
AC source is not 120/240 Vac  
split-phase, or the AC source  
Confirm the nature of the AC source. Check the AC voltage  
between L1, L2, and neutral on the inverter’s input test points.  
neutral is not connected to the (See page 33.) L1-neutral and L2-neutral voltages should be  
inverter.  
120 Vac. L1-L2 voltage should be 240 Vac. Other voltages or  
combinations, such as two phases of a three-phase source  
(208 Vac), or 240 Vac without a neutral, will not be accepted.  
Inverter’s L1 output has been  
Disconnect the wires from the inverter’s AC input terminals or AC  
connected to its L2 input, or the output terminals, or both. If the problem immediately disappears,  
other way around. This  
problem is accompanied by  
shifts in frequency.  
it is an external wiring issue. The inverter’s input and output  
terminals must remain isolated from each other.  
AC source does not meet  
requirements.  
MATE3 system display only: Check the  
screen  
Last AC Disconnect  
hot key and the selection) for the  
AC INPUT  
(using the  
reason for disconnection. If the unit never originally connected,  
check the menu (using the Inverter soft key from the  
Discon  
Warning  
Home screen). Confirm source voltage and frequency.  
Will not connect to  
the AC source.  
AC source meets requirements  
but is “noisy” or irregular.  
MATE3 system display only: The  
irregular AC power. Select that mode for that input.  
input mode can accept  
Generator  
Inverter was manually set to  
disconnect from AC.  
MATE3 system display only: Change the AC Input Control setting  
from  
to with the AC INPUThot key. (If this setting  
Drop Use  
was intentional, then no action is required.)  
Grid use function has  
disconnected from AC.  
MATE3 system display only: If activated prematurely, check both  
the MATE3’s  
settings and the MATE3 clock settings  
Grid Use Time  
menu. (If this setting was intentional, then no  
in the  
System  
action is required.)  
AC INPUT  
hot key screen  
High Battery Transfer (HBX)  
mode has disconnected from  
AC.  
MATE3 system display only: Check the  
to see if HBX mode is in use. If activated prematurely, check the  
settings of HBX mode. (If this setting was intentional, then no  
action is required.)  
input mode has  
disconnected from AC.  
MATE3 system display only: Check the  
part of the  
Settings  
Mini Grid  
Inverter  
mode is in use. If activated prematurely,  
menu to see if  
Mini Grid  
check the settings of  
mode. (If this setting was  
Mini Grid  
intentional, then no action is required.)  
Offset function has caused the  
The Offset function sends excess renewable energy to the loads  
inverter to disconnect from AC. to augment the AC source. If more renewable energy is produced  
(
,
,
, and  
than the loads can consume, the AC source is judged unnecessary  
and the inverter disconnects from it. (See page 19.)  
Support Backup UPS  
input modes.)  
Mini Grid  
Conflicting programming.  
MATE3 system display only: Check to see if more than one of the  
following are enabled:  
, HBX, Grid Use Time. These have  
Mini Grid  
conflicting priorities and only one can be used at a time.  
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Troubleshooting  
Table 2  
Possible Cause  
Troubleshooting  
Possible Remedy  
Symptom  
Charge complete or nearly  
complete.  
Check the DC voltage and charging stage using the MATE3, if  
present. Confirm with DC voltmeter.  
MATE3’s DC meter reads  
Check the DC voltage on the inverter’s DC terminals. If different  
significantly higher than actual from the MATE3 reading, the inverter could be damaged.  
battery voltage.  
Otherwise, check the DC voltage on batteries with a voltmeter. If  
different from the reading on the inverter, this could be a DC  
connection problem.  
Low charge rate.  
High output loads. If total loads Turn off some of the output loads and test the charge rate again.  
and charge exceed the AC input  
setting, charge rate decreases  
to give priority to the loads.  
input mode in use.  
Radian charge rate is limited in this mode (see page 9.)  
See “Will not connect to AC” category.  
Generator  
No AC input.  
Will not charge.  
Charger set to  
.
MATE3 system display only: Check the  
screen with  
Off  
Charger Mode  
or . (If this setting was  
CHARGER  
the  
hot key and set to  
On Auto  
intentional, then no action is required.)  
Unusual voltage on System neutral and ground may Test L1 OUT, L2 OUT, and NEU test points with AC voltmeter. (See  
hot or neutral  
output line.  
not be bonded.  
page 33.) These measurements should give full voltage. Test NEU  
and ground connections. This measurement should read zero  
volts. Any other result means neutral and ground are not bonded  
correctly. If this is the case, usually the hot line reads 60-75 Vac  
and the neutral reads 45-60 Vac, with respect to ground.  
Unusual and  
different voltages  
on AC hot input  
lines.  
Input neutral is not connected  
correctly. The inverter also may input and NEU connections with AC voltmeter. (This can be on  
not connect to the AC source.  
Test L1 input and NEU connections with AC voltmeter. Test L2  
Grid or Gen input, depending where the symptoms appear.) Test  
L1 to L2 input. From hot to neutral should be approximately  
120 Vac. L1 to L2 should be approximately 240 Vac. If the two  
legs are different voltages but still add up to 240 Vac, the neutral  
is not connected to the inverter.  
Grid-tied function has been  
manually disabled.  
MATE3 system display only: Check the  
setting in  
Grid-Tie Enable  
menu. Confirm it is set to  
the  
.
Y
Grid-Tie Sell  
mode not in use on  
the appropriate input.  
MATE3 system display only: Check the  
menu to see if  
Grid Tied  
part of the  
Settings  
Grid Tied  
Inverter  
mode is in use. Confirm that it has been  
selected for the correct Radian input terminals.  
AC source does not meet  
requirements.  
Verify grid voltage and frequency. Determine if they are within  
the inverter’s approved limits. If not, the inverter is behaving  
correctly. Contact the utility company if necessary.  
Will not sell power  
to the utility grid.  
MATE3 system display only: The program selections for limits are  
or  
. They are found in the inverter’s  
menu.  
IEEE user  
Grid-Tie Sell  
Inverter priority.  
MATE3 system display only: Check  
screen using the  
Sell Status  
Home screen’s soft keys. The inverter may be behaving correctly.  
High output loads will consume Turn off some output loads and observe the sell function.  
power before it is returned to  
the utility grid.  
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Troubleshooting  
Table 2  
Possible Cause  
Troubleshooting  
Possible Remedy  
Symptom  
Reduced power sold AC source voltage is driven high When the inverter senses a rise in grid voltage while selling, it  
to the utility grid.  
when the inverter sells large  
amounts of power.  
reduces the sell current, to avoid forcing the voltage to  
unacceptable levels. Check AC input voltage while selling. The  
inverter may be behaving correctly.  
Erratic AC source voltage.  
Check AC voltage on the inverter’s input test points. (See page  
33.) If not consistent, the problem is external.  
MATE3 system display only: AC source voltage may have dipped or  
hovered at a low enough point to crash a sensitive load before  
the inverter could take over. This can happen if the inverter’s  
Grid  
were  
or  
AC Input Voltage Limits Gen AC Input Voltage Limits  
turned down to accommodate a problematic AC source. To make  
the inverter respond sooner, raise the lower limit setting in the  
appropriate menu. (If this setting was intentional, then no action  
is required.)  
Inverter set to  
mode).  
(Search  
The unit will take a moment to come out of Search mode after  
transferring.  
Search  
Loads drop out or  
crash during  
transfer.  
MATE3 system display only: If constant power is required, set to  
INVERTER  
with the  
hot key. (If this setting was intentional,  
ON  
then no action is required.)  
Loads sensitive to inverter’s  
transfer time.  
MATE3 system display only: Most of the inverter’s input modes  
mode not in feature an approximately 12 ms transfer time. Certain loads (such  
UPS  
as highly sensitive computers) may not respond well. The  
use on the appropriate input.  
UPS  
input mode has a transfer time of less than 4 ms. Select this mode  
for the appropriate input. (See page 12.)  
Loads too large.  
The unit can transfer more power than it can invert. If loads are  
oversized, the unit will falter or crash when switching to batteries.  
Reduce the size of the loads.  
Undersized battery cables.  
Battery cables smaller than recommended will cause a significant  
voltage drop when switching to batteries, acting like either an  
overload or a low-battery condition. Size all cables correctly.  
Unit reads AC input, Internal transfer relay may be  
Disconnect AC input wires and turn inverter on. Test the AC input  
and neutral test points with an AC voltmeter. (See page 33.) If  
voltage appears there, the transfer relay may be jammed. Contact  
OutBack Technical Support (see inside front cover of this manual).  
This problem is not common. If this occurs, it will likely occur on  
only the Grid or Gen input — not both.  
even though no  
source is present.  
damaged.  
Inverter’s output has been  
Disconnect the wires from the inverter’s AC input or AC output  
connected to its input. Voltage terminals, or both. If the problem immediately disappears, it is an  
shifts are the result of trying to  
external wiring issue. The inverter’s AC HOT IN and AC HOT OUT  
match its own voltage.  
must remain isolated from each other.  
Inverter clicks  
repeatedly. AC  
output voltage rises  
or drops to unusual  
levels with every  
click.  
Low AC input voltage. Can be  
caused by weak AC source, or  
by faulty input connection.  
Test AC hot and neutral input test points with an AC voltmeter.  
(See page 33.) If low or fluctuating, this is an external problem.  
A generator is connected to the The inverter is not intended to sell power to a generator. The  
input terminals while the unit is selling activity will drive the generator voltage up to the  
in the Grid Tied input mode.  
disconnection point. It will then reconnect to the generator and  
try again. Change input modes, or move the generator to an  
input with a different mode selected.  
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Troubleshooting  
Table 2  
Possible Cause  
Troubleshooting  
Possible Remedy  
Symptom  
Inverter output is being fed  
with an external AC source that the problem clears, reconnect the AC output wires. If the  
Disconnect AC output wires. Turn the inverter off and then on. If  
Inverter hums  
loudly. System  
is out of phase.  
problem recurs when reconnected, an external AC source is  
connected to the output.  
display may show  
messages for high  
battery voltage,  
low battery voltage,  
or backfeed error.  
Inverter has been incorrectly  
stacked with another unit on  
the same output. All units  
come defaulted as master.  
Check HUB ports and make certain the master inverter is plugged  
into port 1.  
MATE3 system display only: Check stacking settings in the  
Inverter  
menu. Only one master is allowed per system.  
Stacking  
AUX output is not connected.  
Test the generator or device to confirm functionality. Test the  
appropriate AUX terminals with a DVM. (If the RELAY AUX  
terminals are in use, test for continuity. If the 12V AUX terminals  
are in use, test for 12 Vdc.) If the proper results are present when  
the menu indicates the function is  
(and the device still does  
On  
not work), then there is an external connection problem. If the  
proper results are not present with the function , the AUX  
On  
Generator, external  
fan, etc. fails to start  
when triggered by  
AUX output.  
circuit may be damaged. Contact OutBack Technical Support (see  
inside front cover of this manual).  
Wrong AUX terminals have  
been programmed.  
MATE3 system display only: Confirm that the AUX menu that was  
programmed matches the terminals that are in use. The  
Auxiliary  
Auxiliary  
menu programs the 12V AUX terminals. The  
Output  
menu programs the RELAY AUX terminals.  
Relay  
Wrong AUX terminals are in use. If generator or external device requires 12 Vdc, confirm the 12V  
AUX terminals have been connected. The RELAY AUX terminals  
do not provide voltage.  
Automatic  
MATE3 system display only: AGS Check both inputs for a second AC source (utility grid). If the  
Generator Start fails function does not work if a valid inverter detects an acceptable AC source, it will not allow AGS.  
to trigger when  
conditions are met  
(or starts when  
conditions are not  
met).  
input is present.  
This is true even if it is internally disconnected from the source  
(due to HBX mode, mode, or similar programming).  
Mini Grid  
MATE3 system display is not  
present.  
AGS programming is located in MATE3 and cannot function if it is  
removed.  
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Troubleshooting  
NOTES:  
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Troubleshooting  
Error Messages  
An Error is caused by a critical fault. In most cases when this occurs, the unit will shut down. The  
MATE3 system display will show an Event and a specific Error message. This screen is viewed using the  
MATE3 Home screen’s soft keys. (See the MATE3 manual for more instructions.) One or more  
messages will display (yes). If a message says (no), it is not the cause of the error.  
Y
N
The Radian series has no external indicators and requires a system display to identify an Error.  
NOTE:  
It is possible to clear an error by resetting the inverter. The inverter must be turned off, and then on,  
to reset it. Other possible steps are shown below (although it is still necessary to reset the inverter).  
Table 3 Error Troubleshooting  
Message  
Causes  
Possible Remedy  
Inverter’s AC regulation cannot be maintained  
under high load conditions.  
Check loads and measure current draw.  
Remove loads as necessary.  
Low Output Voltage  
Inverter exceeded its maximum surge current  
due to severe overload.  
Check the loads and wiring. This issue is usually  
the result of a wiring problem (a short), as  
opposed to a poorly-sized load.  
AC Output Shorted  
AC Output Backfeed  
Stacking Error  
Usually indicates another AC power source (out  
of phase with the inverter) was connected to  
the unit’s AC output.  
Disconnect the AC OUT wires from the inverter.  
Check the wires (not the inverter) with an AC  
voltmeter. If an AC source is present, shut it off.  
Programming problem among stacked units.  
(Often occurs if there is no master.)  
Check stacking programming and designation  
of master. (See page 25.)  
Can also occur when  
occurs.  
Check for output backfeed from an external  
source. Donnect output if necessary.  
AC Output Backfeed  
DC voltage is below low battery cut-out set  
point, usually due to battery discharge.  
If this error accompanies other errors, treat  
those conditions as appropriate.  
Low Battery V  
High Battery V  
If it occurs by itself: Recharge the batteries. The  
error will clear automatically if an external AC  
source is connected and the inverter’s charger  
comes on.  
This error can be triggered by other causes. It  
can appear along with  
,
Low Output Voltage AC  
errors.  
AC Output Backfeed  
, or  
Output Shorted  
DC voltage exceeded acceptable level (specified Check the charging source. This problem is  
on page 15).  
usually the result of external charging. This  
error will clear automatically if conditions are  
removed.  
Inverter has exceeded its maximum allowed  
operating temperature.  
Allow the inverter to remain off for a short time  
to reduce the temperature, or add external  
cooling.  
Over Temperature  
Phase Loss  
A slave was ordered to transfer to AC by the  
master, but no AC is present. The unit continues terminals. If AC voltage is not present, problem  
Check the AC voltage on the inverter input  
inverting. This is the only “Error” that is not  
accompanied by a shutdown.  
is external. If AC voltage is present, the unit may  
be damaged. Contact OutBack Technical  
Support (see inside front cover of this manual).  
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Troubleshooting  
Warning Messages  
A Warning message is caused by a non-critical fault. When this occurs, the unit will not shut down, but  
the MATE3 system display will show an Event and a specific Warning message. This screen is viewed  
using the MATE3 Home screen’s soft keys. (See the MATE3 manual for more instructions.) One or  
more messages will display (yes). If a message says (no), it is not the cause of the warning.  
Y
N
The Radian series has no external indicators and requires the MATE3 system display to identify  
NOTE:  
a Warning.  
Some warnings can become errors if left unattended. Frequency and voltage warnings are meant to  
warn of a problematic AC source. Often the inverter will disconnect from the source. This will occur if  
the condition lasts longer than the inverter’s transfer delay settings. If the inverter disconnects, the  
warning will display as long as the source is present, accompanied by a Disconnect message. (See  
next page.)  
Warning screens can only display warnings; they cannot clear them. The way to correct the fault may  
be obvious from the message.  
Table 4 Warning Troubleshooting  
Message  
Definition  
Possible Remedy  
The AC source is above the upper acceptable  
frequency limit (66 Hz) and prevents  
connection.  
Check the AC source. If it is a generator, reduce  
its speed.  
AC Freq Too High  
The AC source is below the lower acceptable  
frequency limit (54 Hz) and prevents  
connection.  
Check the AC source. If it is a generator, increase  
its speed.  
AC Freq Too Low  
Voltage Too High  
The AC source is above the upper acceptable  
voltage limit on either L1 or L2 (132 Vac  
default setting) and prevents connection.  
Check the AC source. The inverter’s acceptance  
range is adjustable.  
Adjusting the range may accommodate a  
NOTE:  
problematic AC source, but it will not fix it.  
The AC source is below the lower acceptable  
voltage limit on either L1 or L2 (108 Vac  
default setting) and prevents connection.  
Check the AC source. Check the AC wiring. The  
inverter’s acceptance range is adjustable.  
Voltage Too Low  
Input Amps > Max  
Adjusting the range may accommodate a  
NOTE:  
problematic AC source, but it will not fix it.  
AC loads are drawing more current from the  
AC source than allowed by the input setting.  
Check the loads. Oversized loads can open circuit  
breakers. If they exceed the inverter’s transfer  
relay size, the relay can be damaged.  
This issue is usually the result of a poorly-sized  
load, as opposed to a wiring problem.  
An internal inverter temperature sensor may  
be malfunctioning. One of the three internal  
sensor meters may give an unusual reading.  
In the MATE3, the three readings are labeled  
Temp Sensor Bad  
Comm Fault  
and  
.
Capacitors  
Transformer, Output FETs,  
These values are given in degrees Celsius. See  
next page.  
The inverter has suffered an internal  
communication failure.  
Unit still functions, but may require repair.  
Contact OutBack Technical Support (see inside  
front cover of this manual).  
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Troubleshooting  
Table 4 Warning Troubleshooting  
Message  
Definition  
Possible Remedy  
The inverter’s internal cooling fan is not  
operating properly. Lack of cooling may  
result in derated inverter output wattage.  
Turn the battery disconnect off, and then on, to  
determine if the fan self-tests. After this test,  
contact OutBack Technical Support for the next  
step. (The next step will depend on the results of  
the test.)  
Fan Failure  
The system can continue to operate if the  
NOTE:  
inverter can be run at reasonable levels. External  
cooling may also be applied.  
D
isplays the ambient temperature around the  
In the MATE3, these values are given in degrees  
Celsius.  
Transformer  
inverter’s transformer.  
(in  
menu)  
Temps  
If any reading does not seem to reflect the  
inverter’s temperature or conditions, contact  
OutBack Technical Support (see inside front cover  
of this manual).  
Displays the temperature of the FETs (Field  
Effect Transistors) and heat sink.  
Output FETs  
(in menu)  
Temps  
Displays the temperature of the inverter’s  
ripple capacitors.  
Capacitors  
(in menu)  
Temps  
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Troubleshooting  
Disconnect Messages  
Disconnect messages explain the reason that the inverter rejected an AC source. The unit returns to  
AC INPUT  
inverting mode if turned on. This screen is viewed using the  
hot key on the MATE3. (See  
the MATE3 manual for more instructions.) One or more messages will display (yes). If a message  
Y
says (no), it is not the cause of the disconnect. The MATE3 system display may generate a  
N
concurrent Event and Warning message following the disconnect. (See previous page.) If the AC  
source is removed, the Warning will be blank, but the cause of the last disconnect will remain.  
Disconnect messages only display the reason for the disconnection; they cannot correct it. It is usually  
the result of external conditions, not an inverter fault. If the condition is corrected, the inverter will  
reconnect. A few settings can be changed to accommodate problems with the AC source.  
The reasons shown in the Sell Status menu for ceasing to sell power (see next page) are not the same  
as disconnect messages, although they may be caused by the same circumstance. A grid-interactive  
unit can stop selling and still remain connected to the utility grid.  
Table 5 Disconnect Troubleshooting  
Message  
Definition  
Possible Remedy  
The AC source has exceeded  
66 Hz.  
Check AC source. If it is a generator, reduce speed.  
Frequency Too High  
The AC source has dropped below Check AC source. If it is a generator, increase speed.  
54 Hz.  
Frequency Too Low  
Voltage > Maximum  
The AC source has exceeded  
140 Vac (default value) on either  
L1 or L2.  
Check AC source. The inverter’s acceptance range  
is adjustable.  
Adjusting the range may accommodate a  
NOTE:  
problematic AC source, but it will not fix it.  
The AC source has dropped below Check AC source. The inverter’s acceptance range  
Voltage < Minimum  
Backfeed  
108 Vac (default value) on either  
L1 or L2.  
is adjustable.  
Adjusting the range may accommodate a  
NOTE:  
problematic AC source, but it will not fix it.  
Usually indicates another AC  
power source (out of phase with  
Disconnect the AC OUT wires. Check the wires  
(not the inverter) with an AC voltmeter. If an AC  
the inverter) was connected to the source is present, shut it off. (This is more often  
unit’s AC output.  
accompanied by an  
error.)  
AC Output Backfeed  
Check input source and wiring. This can be caused  
by a source with phase problems. It can also be  
caused by transferring from one AC source to  
another before the inverter can synchronize itself.  
Can also occur if an out-of-phase  
AC source is connected to the  
inverter’s AC input.  
The unit cannot remain in phase  
with an erratic AC source.  
Check AC source. This can be caused by a  
Phase Lock  
generator with a poorly regulated output. Some  
generators behave this way when running out of  
fuel. If necessary, set the Radian inverter to the  
This is not an “Error” as  
NOTE:  
defined on page 39 and is not  
accompanied by a shutdown.  
input mode. (See page 9.)  
Generator  
The unit detects something other  
than normal grid conditions. This  
is usually the result of an open AC  
input circuit.  
Check all input circuit breakers for an open circuit.  
This may (rarely) happen with a generator. If  
Island Detect  
necessary, set the inverter to the  
input  
Generator  
mode. (See page 9.)  
42  
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Troubleshooting  
Sell Status  
Sell Status messages describe conditions relating to the inverter’s grid-interactive mode. This screen is  
viewed using the MATE3 Home screen’s soft keys. (See the MATE3 manual for more instructions.) One  
or more messages will display (yes). If a message says (no), it is not the cause of the disconnect.  
Y
N
If the inverter has stopped selling or charging unexpectedly, this screen may identify the reason. More  
often these messages are used by a normally functioning inverter to identify external conditions that  
are preventing selling or charging. (If nothing has stopped, the messages will indicate that as well.)  
The acceptable limits for AC source voltage and frequency are displayed on page 47. If the AC source  
exceeds these limits, the inverter will stop selling and display the appropriate code. After the source  
returns to the acceptable range, the screen will begin a 5-minute timer. When the timer expires, the  
inverter will begin selling power again.  
If the AC source is unstable, it may become unacceptable before the timer expires. This may cause the  
timer to continually reset. It is possible for brief fluctuations to occur that are too fast to be seen on a  
DVM. If this happens, the appropriate message will still appear on the system display for a short time  
to help troubleshoot the problem.  
Additionally, undersized wires or bad connections can result in local voltage problems. If a  
Voltage  
message is accompanied by voltage changes that do not appear at the  
or  
Too Low Voltage Too High  
main utility connection, check the wiring.  
Table 6  
Sell Status Messages  
Definition  
Sell Status  
The  
command has been set to (no).  
Grid-Tie Enable  
N
Selling Disabled  
Qualifying Grid  
All utility grid conditions are acceptable. The inverter is running  
a 5-minute test during which it confirms the grid quality. The  
timer is shown on the screen. At the end of that time, the  
inverter may be ready to sell.  
The utility grid’s AC frequency is below the acceptable range for  
selling. (See page 47.)  
Frequency Too Low  
Frequency Too High  
Voltage Too Low  
Voltage Too High  
Battery < Target  
The utility grid’s AC frequency is above the acceptable range for  
selling. (See page 47.)  
The utility grid’s AC voltage is below the acceptable range for  
selling. (See page 47.)  
The utility grid’s AC voltage is above the acceptable range for  
selling. (See page 47.)  
The battery voltage is below the target voltage for that stage  
(Float, Selling, etc.). No excess energy is available to sell.  
900-0020-01-00 Rev A  
43  
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Troubleshooting  
NOTES:  
44  
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Specifications  
Specifications for Model GS8048  
Table 7 Electrical Specifications for Model GS8048  
Specification  
Nominal DC Input Voltage  
Value  
48 Vdc  
8000 VA  
120/240 Vac  
60 hz  
Continuous Output Power at 25°C  
AC Output Voltage  
AC Output Frequency  
33.3 Aac at 240 Vac  
True Sinewave  
90%  
Continuous AC Output Current at 25°C  
Waveform  
CEC Weighted Efficiency  
< 5%  
< 2%  
Total Harmonic Distortion (maximum)  
Harmonic Distortion (maximum single voltage)  
Output Voltage Regulation  
2 %  
100 Aac at 240 Vac, 200 Aac at 120 Vac  
70.7 Aac at 240 Vac  
16.97 kVA  
12 kVA  
9 kVA  
30 watts  
9.9 watts  
(L1 or L2) 108 – 132 Vac  
54 – 66 Hz  
Maximum Output Current (1 ms peak)  
Maximum Output Current (100 ms RMS)  
Overload Capability (100 ms surge)  
Overload Capability (5 second)  
Overload Capability (30 minute)  
Idle Consumption - Invert mode, no load  
Idle Consumption - Search Mode  
AC Input Voltage Range (Adjustable)  
AC Input Frequency Range  
55 Aac at 240 Vac  
(L1 or L2) 108 – 132 Vac  
(L1 or L2) 59.3 – 60.5 Hz  
30 Aac at 240 Vac  
115 Adc  
AC Input Current (Maximum)  
Grid-Interactive Voltage Range (Default)  
Grid-Interactive Frequency Range (Default)  
Battery Charger Maximum AC Input  
Battery Charger Maximum DC Output  
DC Input Voltage Range  
40 – 64 Vdc  
200 Adc  
424.2 Adc  
0.7 Adc at 12 Vdc  
10 A at 250 Vac or 30 Vdc  
DC Input Current at Rated Power  
Maximum DC Input Current on Surge  
Auxiliary Output  
Auxiliary Relay  
Table 8 Mechanical Specifications for Model GS8048  
Specification  
Inverter Dimensions (H x W x L)  
Shipping Dimensions (H x W x L)  
Inverter Weight  
Value  
16” x 28” x 8.75” (40.6 cm x 71.1 cm x 22.2 cm)  
21” x 34.5” x 14.5” (53.3 cm x 87.6 cm x 36.8 cm)  
125 lbs (56.8 kg)  
140 lbs (64 kg)  
Shipping Weight  
RJ11 (batt temp) and RJ45 (remote)  
Accessory Ports  
Yes  
No  
Vented  
Non-volatile Memory  
Neutral-Ground Bond Switching  
Chassis Type  
900-0020-01-00 Rev A  
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Specifications  
Environmental Specifications  
Table 9 Environmental Specifications for All Models  
Specification  
Rated Temperature Range (meets all specifications)  
Value  
32°F to 122°F  
(0°C to 50°C)  
Operational Temperature Range (functions, but does not necessarily meet all specifications) –40°F to 140°F  
(–40°C to 60°C)  
Storage Temperature Range  
–40°F to 140°F  
(–40°C to 60°C)  
Regulatory Specifications  
Canadian Electrical Code, Part I (CSA C22.2 No. 107.1-01 (R2006)  
UL 1741, 2nd Edition, Revised January 28, 2010, Static Inverter and Charge Controllers for Use in Photovoltaic  
Power Systems  
Inverters intended for grid-interactive use in the United States and Canada must comply with the  
established standards of UL 1741 and IEEE 1547 and 1547.1. These standards provide regulation for  
acceptable output voltage ranges, acceptable output frequency, total harmonic distortion (THD) and  
anti-islanding performance when the inverter is exporting power to a utility source.  
The OutBack grid-interactive models are tested using the procedures listed in IEEE 1547.1 to the  
standards listed in both UL 1741 and IEEE 1547. The following specifications have been validated  
through compliance testing and refer to exporting power to a simulated utility source of less than  
1% voltage total harmonic distortion (THD).  
The output of the Radian series exceeds the minimum power factor of 0.85 with a typical power factor of 0.96  
or better.  
The individual harmonics do not exceed the limits specified in Table 3 of IEEE 1547 Section 4.3.3. The THD of  
the root mean square (RMS) current is less than 5%.  
The Radian inverters cease to export power to the simulated utility source under islanding conditions  
specified in IEEE 1547 Section 4.4.1.  
The Radian inverters also cease to export power to the simulated utility source after the output voltage or  
frequency of the simulated utility source are adjusted to each of the conditions specified in IEEE 1547 Section  
4.2.3 Table 1 and Section 4.2.4 Table 2 within the times specified in those tables. All Radian inverters  
manufactured for use in the United States and Canada are tested to comply with the table below.  
Table 10 Radian Series Interconnection Response Times to  
Abnormal Voltages or Frequencies (per leg)  
Voltage Range  
Frequency  
Seconds  
Cycles  
(AC Volts)  
(Hz)  
Allowed  
Allowed  
V < 60.0  
60.0  
0.16  
9.6  
120.0  
no cessation  
60.0  
60.0 < V < 105.6  
105.6 < V < 132.0  
132.0 < V < 144.0  
V > 144.0  
60.0  
60.0  
60.0  
60.0  
2.0  
no cessation  
1.0  
0.16  
9.6  
120.0  
120.0  
< 59.3  
> 60.5  
0.16  
0.16  
9.6  
9.6  
46  
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Specifications  
The acceptance ranges are selected using the system display. In the MATE3, the options are  
IEEE  
and  
user.  
The  
option allows a range of 108 – 132 Vac at 59.3 – 60.5 Hz  
IEEE  
user  
The  
option does not have a fixed voltage setting. It follows the upper and lower limit settings in the  
Grid AC Input Mode and Limits menu. The default is a range of 108 – 132 Vac.  
Reconnection delay is 6 seconds. Sell delay is 5 minutes. These settings are not adjustable.  
Firmware Revision  
This manual applies to Radian series inverter/chargers with a firmware version of 001.000.xxx  
or higher.  
Default Settings and Ranges  
Table 11 GS8048 Inverter Settings  
Field  
Item  
Default  
Off  
Minimum  
Maximum  
INVERTER  
Hot Key Inverter Mode  
On, Off, or Search  
CHARGER  
Hot Key Charger Control  
On  
On or Off  
AC Input  
Hot Key  
AC Input Mode  
Use  
Drop or Use  
Sensitivity (see page 16 for increments)  
Pulse Length  
10  
0
250  
Search  
8 AC cycles  
60 AC cycles  
Grid  
4 AC cycles  
4 AC cycles  
20 AC cycles  
120 AC cycles  
Pulse Spacing  
Input Priority  
Grid or Gen  
AC Input and  
Current Limit  
Grid Input AC Limit  
Gen Input AC Limit  
Charger AC Limit  
50 Aac  
50 Aac  
30 Aac  
5 Aac  
5 Aac  
0 Aac  
55 Aac  
55 Aac  
30 Aac  
Generator, Support, Grid Tied, UPS, Backup,  
Mini Grid  
Input Mode  
Grid Tied  
Voltage Limit Lower  
(Voltage Limit)Upper  
Transfer Delay  
108 Vac  
132 Vac  
70 Vac  
110 Vac  
Grid AC Input  
Mode and Limits  
125 Vac  
140 Vac  
6 AC cycles  
0.2 minutes  
0 AC cycles  
0.2 minutes  
240 AC cycles  
15 minutes  
Connect Delay  
Generator, Support, Grid Tied, UPS, Backup,  
Mini Grid  
Input Mode  
Generator  
Voltage Limit Lower  
(Voltage Limit) Upper  
Transfer Delay  
108 Vac  
140 Vac  
70 Vac  
125 Vac  
110 Vac  
140 Vac  
Gen AC Input  
Mode and Limits  
6 AC cycles  
0.5 minutes  
240 Vac  
0 AC cycles  
0.2 minutes  
220 Vac  
240 AC cycles  
15 minutes  
260 Vac  
Connect Delay  
Output Voltage  
AC Output  
Cut-Out Voltage  
Cut-In Voltage  
Absorb Voltage  
(Absorb) Time  
Float Voltage  
(Float) Time  
42 Vdc  
50 Vdc  
36 Vdc  
40 Vdc  
48 Vdc  
56 Vdc  
Low Battery  
57.6 Vdc  
1.0 hours  
54.4 Vdc  
1.0 hours  
50 Vdc  
52 Vdc  
64 Vdc  
0.0 hours  
48 Vdc  
24.0 hours  
60 Vdc  
Battery Charger  
0.0 hours  
48 Vdc  
24.0 hours  
52 Vdc  
Re-Float Voltage  
Equalize Voltage  
(Equalize) Time  
58.4 Vdc  
1.0 hours  
56 Vdc  
0.0 hours  
68 Vdc  
24.0 hours  
Battery Equalize  
900-0020-01-00 Rev A  
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Specifications  
Table 11 GS8048 Inverter Settings  
Field  
Item  
Default  
Minimum  
Off, Auto or On  
Load Shed, Gen Alert, Fault, Vent Fan, Cool Fan,  
DC Divert, IEEE, Source Status, AC Divert  
Maximum  
Aux Control  
Aux Mode  
Off  
Vent Fan  
(Load Shed) ON: Batt >  
(Load Shed ON) Delay  
(Load Shed) OFF: Batt <  
(Load Shed OFF) Delay  
(Gen Alert) ON: Batt <  
(Gen Alert ON) Delay  
(Gen Alert) OFF: Batt >  
(Gen Alert OFF) Delay  
(Vent Fan) ON: Batt >  
(Vent Fan) Off Delay  
(DC Divert) ON: Batt >  
(DC Divert ON) Delay  
(DC Divert) OFF: Batt <  
(DC Divert OFF) Delay  
(AC Divert) ON: Batt >  
(AC Divert ON) Delay  
(AC Divert) OFF: Batt <  
(AC Divert OFF) Delay  
Aux Control  
56 Vdc  
30 Secs  
56 Vdc  
18 Secs  
44 Vdc  
30 Secs  
56 Vdc  
30 Secs  
56 Vdc  
18 Secs  
56 Vdc  
30 Secs  
44 Vdc  
30 Secs  
56 Vdc  
30 Secs  
44 Vdc  
30 Secs  
40 Vdc  
6 Secs  
48 Vdc  
6 Secs  
40 Vdc  
6 Secs  
48 Vdc  
6 Secs  
48 Vdc  
6 Secs  
48 Vdc  
6 Secs  
40 Vdc  
6 Secs  
48 Vdc  
6 Secs  
40 vdc  
6 Secs  
72 Vdc  
1500 Secs  
72 Vdc  
1500 Secs  
56 Vdc  
1500 Secs  
72 Vdc  
1500 Secs  
72 Vdc  
Auxiliary Output  
1500 Secs  
72 Vdc  
1500 Secs  
56 Vdc  
1500 Secs  
72 Vdc  
1500 Secs  
56 Vdc  
1500 Secs  
Off  
Off, Auto or On  
Load Shed, Gen Alert, Fault, Vent Fan, Cool Fan,  
DC Divert, IEEE, Source Status, AC Divert  
Aux Mode  
Gen Alert  
(Load Shed) ON: Batt >  
(Load Shed ON) Delay  
(Load Shed) OFF: Batt <  
(Load Shed OFF) Delay  
(Gen Alert) ON: Batt <  
(Gen Alert ON) Delay  
(Gen Alert) OFF: Batt >  
(Gen Alert OFF) Delay  
(Vent Fan) ON: Batt >  
(Vent Fan) Off Delay  
(DC Divert) ON: Batt >  
(DC Divert ON) Delay  
(DC Divert) OFF: Batt <  
(DC Divert OFF) Delay  
(AC Divert) ON: Batt >  
(AC Divert ON) Delay  
(AC Divert) OFF: Batt <  
(AC Divert OFF) Delay  
56 Vdc  
30 Secs  
56 Vdc  
18 Secs  
44 Vdc  
30 Secs  
56 Vdc  
30 Secs  
56 Vdc  
18 Secs  
56 Vdc  
30 Secs  
44 Vdc  
30 Secs  
56 Vdc  
30 Secs  
44 Vdc  
30 Secs  
40 Vdc  
6 Secs  
48 Vdc  
6 Secs  
40 Vdc  
6 Secs  
48 Vdc  
6 Secs  
48 Vdc  
6 Secs  
48 Vdc  
6 Secs  
40 Vdc  
6 Secs  
48 Vdc  
6 Secs  
40 vdc  
6 Secs  
72 Vdc  
1500 Secs  
72 Vdc  
1500 Secs  
56 Vdc  
1500 Secs  
72 Vdc  
1500 Secs  
72 Vdc  
1500 Secs  
72 Vdc  
Auxiliary  
Relay  
1500 Secs  
56 Vdc  
1500 Secs  
72 Vdc  
1500 Secs  
56 Vdc  
1500 Secs  
Stack Mode  
Master  
Master, Slave  
Inverter Stacking  
Master Power Save Level  
Slave Power Save Level  
Grid-Tie Enable  
0
1
0
1
31  
31  
Power Save  
(in Stacking Menu)  
Y
Y or N  
Grid-Tie Sell  
Calibrate  
Sell Voltage  
Grid-Tie Window  
Input Voltage  
Output Voltage  
Battery Voltage  
52 Vdc  
40 Vdc  
60 Vdc  
IEEE  
IEEE or user  
0
0
0
-7  
-7  
-0.8  
7
7
0.8  
48  
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Product Registration  
The purchase of an OutBack Power Technologies product is an important investment. Registering the  
products will help us maintain the standard of excellence you expect from us in terms of performance,  
quality and reliability.  
Please take a moment to register and provide us with some important information.  
Registration can be done as follows:  
Go to the following web site.  
or  
Fill out the information on this form (pages 49 and 50) and return a paper copy using a postal service to the  
following address:  
OutBack Power Technologies  
Attn: Warranty Registration  
5917 – 195th Street N.E., #7  
Arlington, WA 98223 USA  
Be sure to keep a copy for your records.  
SYSTEM OWNER  
Name  
Address  
City, State,  
Postal or Zip Code  
Country  
Telephone Number  
E-mail  
SYSTEM PURCHASE  
Product Model Number  
Product Serial Number  
Sold by  
Purchase Date  
900-0020-01-00 Rev A  
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Product Registration  
INSTALLATION INFORMATION  
System Install/Commission Date  
System Array Size  
System Array Nominal Voltage  
Type of PV Modules  
System Battery Bank Size (Amp-Hours)  
Brand and Model of Batteries  
Does this system include an auxiliary AC generator?  
If yes, please specify brand and model of generator  
INSTALLER INFORMATION  
Contractor Number  
Installer Name  
Installer Address  
Installer City, State, Postal or Zip Code, Country  
Installer Telephone/E-mail  
Please check ALL factors affecting purchase decision:  
Grid-Interactive Capability  
Product Reputation  
Back-up Capability  
Reputation of OutBack Power Technologies  
Value  
Looks  
Other  
Extended Warranty  
For areas where it is a requirement of local programs, OutBack Power Technologies offers a five-year  
(5) extension to the standard five-year (5) Limited Warranty for the Radian Series Inverter/Charger. To  
request a 5-year limited warranty extension for a total effective warranty coverage period of ten (10)  
years, please include a payment in the amount of  
USD per inverter, payable to OutBack Power  
$899  
Technologies, Inc. along with the Product Registration. Please submit within 90 days of the first retail  
sale of the inverter(s). Please indicate the quantity of each product.  
Be sure to keep a copy for your records.  
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Warranty  
5-Year Limited Warranty for Radian Products  
OutBack Power Technologies, Inc. (“OutBack”) provides a five-year (5) limited warranty (“Warranty”)  
against defects in materials and workmanship for its Radian Series products (“Product”) if installed in  
fixed location applications.  
The term of this Warranty begins on the Product(s) initial purchase date, or the date of receipt of the  
Product(s) by the end user, whichever is later. This must be indicated on the invoice, bill of sale,  
and/or warranty registration card submitted to OutBack. This Warranty applies to the original OutBack  
Product purchaser, and is transferable only if the Product remains installed in the original use location.  
The warranty does not apply to any Product or Product part that has been modified or damaged by  
the following:  
Installation or Removal;  
Alteration or Disassembly;  
Normal Wear and Tear;  
Accident or Abuse;  
Corrosion;  
Lightning;  
Repair or service provided by an unauthorized repair facility;  
Operation or installation contrary to manufacturer product instructions;  
Fire, Floods or Acts of God;  
Shipping or Transportation;  
Incidental or consequential damage caused by other components of the power system;  
Any product whose serial number has been altered, defaced or removed;  
Any other event not foreseeable by OutBack.  
OutBack’s liability for any defective Product, or any Product part, shall be limited to the repair or  
replacement of the Product, at OutBack’s discretion. OutBack does not warrant or guarantee  
workmanship performed by any person or firm installing its Products. This Warranty does not cover  
the costs of installation, removal, shipping (except as described below), or reinstallation of Products or  
parts of Products.  
THIS LIMITED WARRANTY IS THE EXCLUSIVE WARRANTY APPLICABLE TO OUTBACK PRODUCTS.  
OUTBACK EXPRESSLY DISCLAIMS ANY OTHER EXPRESS OR IMPLIED WARRANTIES OF ITS PRODUCTS,  
INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A  
PARTICULAR PURPOSE. OUTBACK ALSO EXPRESSLY LIMITS ITS LIABILITY IN THE EVENT OF A PRODUCT  
DEFECT TO REPAIR OR REPLACEMENT IN ACCORDANCE WITH THE TERMS OF THIS LIMITED WARRANTY  
AND EXCLUDES ALL LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, INCLUDING  
WITHOUT LIMITATION ANY LIABILITY FOR PRODUCTS NOT BEING AVAILABLE FOR USE OR LOST  
REVENUES OR PROFITS, EVEN IF IT IS MADE AWARE OF SUCH POTENTIAL DAMAGES. IF YOU ARE A  
CONSUMER THAT PURCHASED THIS PRODUCT IN A MEMBER STATE OF THE EUROPEAN UNION, YOU  
MAY HAVE ADDITIONAL STATUTORY RIGHTS UNDER DIRECTIVE 1999/44/EC. THESE RIGHTS MAY VARY  
FROM EU MEMBER STATE TO EU MEMBER STATE. SOME STATES (OR JURISDICTIONS) MAY NOT ALLOW  
THE EXCLUSION OR LIMITATION OF WARRANTIES OR DAMAGES, SO THE ABOVE EXCLUSIONS OR  
LIMITATIONS MAY NOT APPLY TO YOU.  
900-0020-01-00 Rev A  
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Warranty  
How to Arrange for Warranty Service  
During the warranty period beginning on the invoice date, OutBack Power Technologies will repair or  
replace products covered under this limited warranty that are returned to OutBack Power  
Technologies’ facility or to an OutBack Power Technologies authorized repair facility, or that are  
repaired on site by an OutBack Power Technologies authorized repair person.  
IMPORTANT:  
For full Warranty description, see previous page.  
Contacting OutBack  
To request warranty service, contact OutBack Technical Support at  
or  
+1.360.618.4363 [email protected]  
or direct at  
+1.360.435.6030  
. To ensure warranty coverage, this contact must  
be within the effective warranty period. If service is required, the OutBack Technical Support  
representative will issue a Return Material Authorization (RMA) number.  
Troubleshooting  
In the event of a Product failure, the customer will need to work with an OutBack Technical Support  
representative to perform the necessary troubleshooting. This is a required step before a return can  
be performed. Troubleshooting requires a qualified technician to be present at the site of the Product,  
with a quality voltmeter that measures both DC and AC. The OutBack representative will request  
voltmeter readings, Product error messages, and other information. Many, many problems can be  
resolved on-site. If the customer is not willing or able to provide these readings (or is not willing or  
able to visit the site), and the Product is found to have no problems upon return, OutBack may choose  
to charge additional labor and handling fees up to $180.00 U.S.  
Return Material Authorization (RMA)  
A request for an RMA number requires all of the following information:  
1. Product model and serial number;  
2. Proof-of-purchase in the form of a copy of the original Product purchase invoice or receipt  
confirming the Product model number and serial number;  
3. Description of the problem; and  
4. Shipping address for the repaired or replacement equipment.  
Upon receiving this information, the OutBack representative can issue an RMA number.  
52  
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Warranty  
Returning Product to OutBack  
After receiving the RMA number, the customer must pack the Product(s) authorized for return, along  
with a copy of the original purchase invoice and warranty certificate, in the original Product shipping  
container(s) or packaging providing equivalent or reasonable protection. The RMA number must be  
written on the outside of the packaging where it is clearly visible.  
If Product is within the warranty period, OutBack will cover pre-paid shipping with prior arrangement.  
The Product(s) must be shipped back to OutBack Power Technologies in their original or equivalent  
packaging, to the following address:  
OutBack Power Technologies  
RMA # ____________________  
6115 192nd Street NE  
Arlington, WA 98223 USA  
The customer must insure the shipment, or accept the risk of loss or damage during shipment. If a  
shipping box is needed for return of a Product, OutBack will send a shipping box upon request.  
IMPORTANT:  
OutBack is not responsible for shipping damage caused by improperly packaged  
Products, the repairs this damage might require, or the costs of these repairs.  
If, upon receipt of the Product, OutBack determines the Product or Product part is defective and that  
the defect is covered under the terms of this Warranty, OutBack will then, and only then, ship a  
repaired or replacement Product or Product part to the purchaser freight prepaid, non-expedited,  
using a carrier of OutBack’s choice, where applicable.  
If Product fails in ninety (90) or fewer days from original purchase date, OutBack will replace with a  
new Product. If Product fails after ninety (90) days and up to expiration of warranty, OutBack will, at its  
discretion, either repair and return a Product, or ship a replacement Product. OutBack will determine  
whether a Product is to be repaired or replaced in accordance with Product age and model. OutBack  
will authorize advance shipment of a replacement based on Product age and model.  
In cases where an OutBack dealer or distributor replaces a Product more than ninety (90) days old with  
a new Product, OutBack will NOT compensate that dealer or distributor with new stock unless the  
exchange was authorized in advance by OutBack.  
Out of Warranty  
If Product is out of warranty, OutBack will repair and return Product for a fee. Alternately, if applicable,  
OutBack will advance-ship replacement parts for a fee upon request.  
If a shipping box is needed for return of out-of-warranty Product, OutBack will send a shipping box  
upon request. The customer is responsible for paying shipping to OutBack.  
The warranty period of any repaired or replacement Product or Product part is ninety (90) days from  
the date of shipment from OutBack, or the remainder of the initial warranty term, whichever is greater.  
This Warranty is void for any Product that has been modified by the customer without authorization  
by OutBack. A Product with a voided warranty will be treated the same as one with an expired  
warranty.  
900-0020-01-00 Rev A  
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Warranty  
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Index  
1
D
10-year Warranty ...............................................................50  
12V AUX................................................................................30  
Default Settings .................................................................47  
Definitions..............................................................................2  
Design ...................................................................................16  
Disconnect...........................................................................42  
Diversion ..............................................................................30  
DVM................................................................................... 9, 10  
A
Absorption Stage...............................................................21  
AC Drop ................................................................................31  
AC Input,...............................................................................17  
AC Source Acceptance..............................................18, 47  
AC Test Points.....................................................................33  
Adding New Devices........................................................10  
AGS.........................................................................................32  
Audience ................................................................................1  
AUX...........................................................................................2  
AUX ........................................................................................30  
AUX Functions  
E
Equalization.........................................................................25  
Errors......................................................................................39  
ETL ........................................................................................2, 7  
Extended Warranty...........................................................50  
F
AC Drop...........................................................................31  
Cool Fan ..........................................................................30  
Diversion.........................................................................30  
Fault..................................................................................31  
GenAlert...................................................................31, 32  
LoadShed........................................................................31  
Remote............................................................................31  
Vent Fan..........................................................................31  
Features ..................................................................................7  
Float Stage...........................................................................23  
Functional Test.....................................................................9  
Functions  
AC Input Limit...............................................................17  
AC Transfer.....................................................................19  
Battery Charging..........................................................22  
Inverting..........................................................................16  
LBCO.................................................................................16  
Offset................................................................................20  
Search ..............................................................................17  
B
Backup...................................................................................14  
Battery Charging.........................................................21, 22  
Battery Charging Graph ..................................................22  
G
GenAlert.........................................................................31, 32  
Generator .............................................................................11  
Sizing................................................................................19  
Grid Tied ...............................................................................12  
Grid Use Timer....................................................................32  
Grid-Interactive ....................................................................2  
C
Charging  
Absorption Stage.........................................................21  
Float Stage .....................................................................23  
Float Timer .....................................................................24  
New Bulk.........................................................................24  
None.................................................................................21  
Compliance Testing..........................................................46  
Cool Fan................................................................................30  
CSA .................................................................................... 2, 46  
H
HBX.........................................................................................32  
High Battery Cut-Out........................................................16  
High Battery Transfer (HBX) ...........................................15  
900-0020-01-00 Rev A  
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Index  
I
Settings.................................................................................47  
Silent...............................................................................23, 29  
Specifications  
IEEE.................................................................................... 2, 46  
Input Modes........................................7, 11, 17, 20, 22, 23  
Input Priorities....................................................................17  
Inverting ...............................................................................16  
Electrical..........................................................................45  
Mechanical.....................................................................45  
Environmental ..............................................................46  
Regulatory......................................................................46  
Stacking ................................................................................27  
Parallel.............................................................................28  
Startup.....................................................................................9  
Support.................................................................................12  
Symbols Used .......................................................................1  
System Display .................................................................2, 8  
L
LBCO (Low Battery Cut-Out) ..........................................16  
Levels, Power Save............................................................29  
LoadShed .............................................................................31  
M
T
MATE or MATE2....................................................................7  
MATE3 .....................................................................................8  
Minigrid..........................................................................15, 32  
Modes......................................................................................7  
Backup.............................................................................14  
Generator .......................................................................11  
Grid Tied..........................................................................12  
Minigrid....................................................................15, 32  
Support ...........................................................................12  
UP......................................................................................14  
Target ....................................................................................20  
Temperature ................................................................40, 46  
Temperature Compensation .........................................26  
Terms and Definitions........................................................2  
Test Points............................................................................33  
Three-Stage Charging......................................................22  
Timers  
Absorption ..............................................................21, 24  
Equalize...........................................................................25  
Float..................................................................................24  
Transfer Relay...............................................................17, 19  
Troubleshooting.........................................................33, 52  
Disconnect Messages.................................................42  
Error Messages..............................................................39  
Sell Status Messages...................................................43  
Warning Messages ......................................................40  
O
Offset .....................................................................................20  
P
Parallel Stacking.................................................................28  
Power Save ..........................................................................29  
Powering Down .................................................................10  
U
UL...................................................................................3, 7, 46  
UP (Uninterruptible Power)............................................14  
Utility Grid..............................................................................3  
R
Registration .........................................................................49  
Regulatory............................................................................46  
RELAY AUX...........................................................................30  
Remote System Display.....................................................2  
Remote Temperature Sensor (RTS) .............................26  
Response Times .................................................................46  
RTS............................................................................................2  
V
Vent Fan Control................................................................31  
W
Warnings .............................................................................40  
Warranty...............................................................................51  
10-Year ............................................................................50  
Contacting .....................................................................52  
Extended.........................................................................50  
Registration....................................................................49  
RMA ..................................................................................52  
Shipping..........................................................................53  
S
Safety.......................................................................................1  
General..............................................................................3  
Search....................................................................................17  
Sell Status.............................................................................43  
56  
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North America:  
5917 – 195th St NE, #7  
Arlington, WA 98223 USA  
+1.360.435.6030  
900-0020-01-00 Rev A  
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