Xantrex Technology Portable Generator power Inverter Stacking User Manual

Smart choice for power  
Installation Guide  
Inverter Stacking  
Control Series  
(ISC-S) Cable  
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Inverter Stacking Control Series (ISC-S)  
Cable  
Installation Guide  
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About Xantrex  
Xantrex Technology Inc. is a world-leading supplier of advanced power electronics and controls with products from  
50 watt mobile units to one MW utility-scale systems for wind, solar, batteries, fuel cells, microturbines, and backup  
power applications in both grid-connected and stand-alone systems. Xantrex products include inverters, battery  
chargers, programmable power supplies, and variable speed drives that convert, supply, control, clean, and distribute  
electrical power.  
Trademarks  
Inverter Stacking Control – Series Cable is a trademark of Xantrex International. Xantrex is a registered trademark of  
Xantrex International.  
Other trademarks, registered trademarks, and product names are the property of their respective owners and are used  
herein for identification purposes only.  
Notice of Copyright  
Inverter Stacking Control Series (ISC-S) Cable Installation Guide© January 2004 Xantrex International. All rights  
reserved.  
Disclaimer  
UNLESS SPECIFICALLY AGREED TO IN WRITING, XANTREX TECHNOLOGY INC. (“XANTREX”)  
(a) MAKES NO WARRANTY AS TO THE ACCURACY, SUFFICIENCY OR SUITABILITY OF ANY  
TECHNICAL OR OTHER INFORMATION PROVIDED IN ITS MANUALS OR OTHER DOCUMENTATION.  
(b) ASSUMES NO RESPONSIBILITY OR LIABILITY FOR LOSS OR DAMAGE, WHETHER DIRECT,  
INDIRECT, CONSEQUENTIAL OR INCIDENTAL, WHICH MIGHT ARISE OUT OF THE USE OF SUCH  
INFORMATION. THE USE OF ANY SUCH INFORMATION WILL BE ENTIRELY AT THE USER’S RISK.  
Date and Revision  
January 2004 Rev A  
Part Number  
975-0059-01-01 Rev A  
Contact Information  
Telephone: 1 800 670 0707 (toll free North America)  
1 360 925 5097 (direct)  
Fax:  
1 800 994 7828 (toll free North America)  
1 360 925 5143 (direct)  
Email:  
Web:  
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About This Guide  
Purpose  
The purpose of this Installation Guide is to provide explanations and procedures  
for installing the Inverter Stacking Control – Series Cable and provides  
information regarding stacking two identical Sine Wave Plus inverters.  
Scope  
The Guide provides safety guidelines, detailed planning and setup information for  
stacking inverters, and procedures for installing the ISC-S cable.  
Audience  
The Guide is intended for anyone who needs to install series-stacked, Sine Wave  
Plus inverters using the Inverter Stacking Control – Series Cable. Installers should  
be certified technicians or electricians.  
Organization  
This Guide is organized into three chapters.  
Warranty and Product Information is provided at the end of the Guide.  
975-0059-01-01 Rev A  
iii  
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About This Guide  
Conventions Used  
The following conventions are used in this guide.  
WARNING  
Warnings identify conditions that could result in personal injury or loss of life.  
CAUTION  
Cautions identify conditions or practices that could result in damage to the unit or  
other equipment.  
Important: These notes describe things which are important for you to  
know, but not as serious as a caution or warning.  
Abbreviations and Acronyms  
The following acronyms and abbreviations are used in this guide:  
AC  
Alternating Current  
ASC  
BTS  
Authorized Service Center  
Battery Temperature Sensor  
Direct Current  
DC  
DCCB  
DVM  
GSM  
ISC-S cable  
Hz  
DC Conduit Box  
Digital Voltage Meter  
Generator Start Module  
Inverter Stacking Control – Series Cable  
Hertz  
RMA  
Vac  
Return Material Authorization  
AC Voltage  
Related Information  
You can find more information about Xantrex Technology Inc. as well as its  
products and services at www.xantrex.com  
iv  
975-0059-01-01 Rev A  
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Important Safety Instructions  
WARNING  
This chapter contains important safety and operating instructions. Read and keep this  
Installation Guide for future reference.  
1. Before installing and using the ISC-S cable, read all instructions and  
cautionary information in this guide.  
2. Do not expose the ISC-S cable to rain, snow, spray, or water.  
3. Use only attachments recommended or sold by the manufacturer. Doing  
otherwise may result in a risk of fire, electric shock, or injury to persons.  
4. Do not operate the ISC-S cable if it has been damaged in any way. If the ISC-  
S cable is damaged, see the Warranty section.  
5. Do not disassemble the ISC-S cable. It contains no user-serviceable parts. See  
Warranty for instructions on obtaining service. Attempting to service the ISC-  
S cable yourself will void your wawrranty.  
6. To reduce the risk of electrical shock, disconnect both AC and DC power  
from the inverters before attempting any maintenance or cleaning or working  
on any circuits connected to the ISC-S cable. Turning off the inverters will not  
reduce this risk.  
975-0059-01-01 Rev A  
v
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vi  
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Contents  
Important Safety Instructions- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -v  
Warranty and Return Information - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - WA–1  
Index- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - IX–1  
975-0059-01-01 Rev A  
vii  
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viii  
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Figures  
Figure 1-3 Inverter Stacking Control – Series Cable (ISC-S cable) - - - - - - - - - - - - - - - - - - - - - - - 1–5  
Figure 2-4 AC Wiring for Series-stacked SW Plus Inverters Off Grid- - - - - - - - - - - - - - - - - - - - - 2–9  
Figure 2-5 AC Wiring for Series-stacked SW Plus Inverters OnGrid - - - - - - - - - - - - - - - - - - - - 2–11  
Figure 2-6 Generator Wiring to Series-stacked SW Plus Inverters - - - - - - - - - - - - - - - - - - - - - - 2–13  
975-0059-01-01 Rev A  
ix  
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Introduction  
1
Chapter 1, “Introduction” provides information on stacking of Sine  
Wave Plus inverters.  
The following topics are covered in this chapter.  
For this topic:  
See:  
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Introduction  
Stacking Inverters  
Two identical, series-stacked, inverters can be connected together for the  
following purposes.  
The voltage output of a single inverter is insufficient to power the 240 Vac  
loads attached to the system;  
Multi-wire branch circuits exists in the current structure. Please see Appendix  
F, Multi-wire Branch Circuit Wiring”, in the Sine Wave Plus Owners  
Manual for additional information.  
Important: Inverter types and models must be identical for stacking  
configurations. In other words, you can use two SW Plus 2548 inverters, or two  
SW Plus 4048 inverters. You cannot stack a SW Plus 2548 with a SW Plus 4048.  
Different types of inverters cannot be intermixed in a stacking configuration.  
Models with 230 Vac, 50 Hz, output cannot be series-stacked.  
Stacking inverters in a “series” configuration can double the output voltage at the  
same current level as an individual inverter.  
Series-stacking connects the neutral outputs of each inverter together and enables  
the inverters to synchronize their hot outputs to be 180 degrees out-of-phase with  
each other. This maintains the wattage output at the rated level, but doubles the  
voltage output available, thereby allowing 240 Vac loads to be supported by the  
system.  
Example: Two series-stacked, Sine Wave Plus 4024 Vac inverters can run both  
120 Vac and 240 Vac loads at 33 amps continuous output.  
Stacking inverters in a series configuration requires the use of the Inverter  
Stacking Control-Series (ISC-S) Cable.  
1–2  
975-0059-01-01 Rev A  
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Stacking Inverters  
Figure 1-1 Off-Grid Applications with Series-Stacked Inverters  
975-0059-01-01 Rev A  
1–3  
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Introduction  
Figure 1-2 On-Grid Applications with Series-stacked Inverters  
1–4  
975-0059-01-01 Rev A  
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The ISC-S Cable  
The ISC-S Cable  
Required accessory  
cable  
Stacking two identical inverters requires the use of the Inverter Stacking Control –  
Series Cable (ISC-S cable). The ISC-S cable is a special cable specifically  
designed for series-stacking two identical inverters. It consists of one 36-inch  
stacking control cable with two 25-pin D connectors. It connects to the “Stacking  
Ports” on the respective inverters and allows the AC output of two (identical)  
inverters to provide both 120 and 240 Vac, 60 Hz.  
CAUTION: Damage to Equipment  
Do not use a standard computer cable in place of the ISC-S cable cable. This ISC-  
S cable is custom made for Xantrex to allow series-stacking with the SW Plus  
Inverter/charger. Look for the label as shown in Figure 1-3 to properly identify the  
cable.  
Use of any other cable may damage your inverters and will not be covered by  
Warranty/ Repair.  
Xantrex ISC-S Cable  
CAUTION: This cable is designed  
for series stacking of the SW,  
SW Plus, or PS inverters only.  
Use of any other cable may damage  
your inverter and void it’s warranty.  
Figure 1-3 Inverter Stacking Control – Series Cable (ISC-S cable)  
975-0059-01-01 Rev A  
1–5  
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What it  
does  
The ISC-S cable provides communication between the two stacked inverters for two  
purposes.  
It provides synchronization information for inverting and charging.  
It provides a method for one inverter detecting an error condition to send a shut-  
down command to the other inverter, to prevent a 240Vac load from only receiving  
one leg of power.  
What it  
does not do  
The ISC-S cable does not allow programming or access to the display from one inverter  
to the other. If there are changes to the default setting necessary, each inverter must be  
programmed separately. This includes selecting “On” in the “On/Off” menu.  
1–6  
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Installation  
2
Chapter 2, “Installation” provides information on installing the  
DC wiring, AC Wiring, and the ISC-S for Sine Wave Plus inverters.  
The following topics are covered in this chapter.  
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Installation  
DC Wiring  
The success of series-stacked, inverter systems is dependent on the quality and  
maintenance of the DC connections. Stacked inverter sets are far less forgiving to  
long, undersized, uneven, and/or poor connections than are single inverters.  
Battery Requirements for Series-stacked Inverters  
When inverters are “stacked” they must operate from a common battery bank. In  
other words, the DC negative of one inverter must be common with the second  
inverter and likewise for the DC positive.  
For example:  
If you have eight 6-volt batteries in a 24-volt configuration, they would be  
arranged in two rows of four batteries (see Appendix C of the Sine Wave Plus  
Owners Manual for diagrams of various arrangements). The negative ends of  
the two “strings” of batteries must be jumpered together to become common  
with each other. Likewise, the positive ends of the two “strings” must also be  
jumpered together so that they are also common with each other.  
Battery-Bank Configuration for Series-stacked Inverters  
When using inverters in a stacked configuration, the same battery bank must be  
used for both inverters. To ensure even charging of the batteries, each inverter  
must be connected to both strings (i.e., positive cable to string two, and negative  
cable to string one for inverter 1, and positive cable to string one and negative  
cable to string two for inverter 2) as shown in Figure 2-1. In other words, a  
separate positive (+) and negative (–) cable pair is required for each inverter in the  
series-stacked configuration. This means there will be four battery cables from the  
stacked inverters to the battery bank.  
Refer to the Owner’s Manual for the Sine Wave Plus to determine the correct size  
and length of cable required.  
DC conduit for  
L1 Inverter  
DC conduit for  
L2 Inverter  
Series String 1  
+
+
+
+
12 Volt  
Battery  
200 Ah  
24 Vdc/200 Ah  
12 Volt  
Battery  
200 Ah  
Series-strings  
wired in Parallel  
24 Vdc/400 Ah  
Series String 2  
24 Vdc/200 Ah  
12 Volt  
Battery  
200 Ah  
12 Volt  
Battery  
200 Ah  
Figure 2-1 Example of Battery Connections for Series-stacked Inverters  
(24 Vdc shown)  
2–2  
975-0059-01-01 Rev A  
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DC Wiring  
Grounding Series-stacked Inverters  
To ground series-stacked inverters:  
1. Connect the ground bond in the DC disconnect between the inverters and the  
batteries to the primary grounding electrode, in accordance with local and  
national electrical codes.  
2. Connect an appropriately sized ground wire from the chassis bonding ground  
lug on the L1 inverter DC end to the ground bond inside the DC disconnect.  
3. Connect a second appropriately sized ground wire from the chassis bonding  
ground lug on the L2 inverter DC end to a different terminal in the ground  
bond inside the DC disconnect.  
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Sine Wave Plus Inverter/Charger  
xantrex  
L1 Inverter  
Chassis Bonding  
Ground Lug  
+
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I
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C
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DC  
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DISCONNECT  
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Sine Wave Plus Inverter/Charger  
xantrex  
SHUNT &  
NEGATIVE BUS  
L2 Inverter  
Chassis Bonding  
Ground Lug  
ON  
ON  
ON  
OFF  
OFF  
OFF  
GROUND  
To primary  
Earth/ground  
connections  
Figure 2-2 DC Grounding of Series-stacked Inverters  
975-0059-01-01 Rev A  
2–3  
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Installation  
Connecting the Battery Bank to the Inverters  
The following instructions are illustrated in Figure 2-3.  
To connect the battery (or battery bank) to the inverters:  
1. Connect POSITIVE cables:  
a) one cable from the battery POSITIVE terminal to a circuit breaker in the  
DC disconnect (torque to manufacturer’s recommendations). The DC  
disconnect should be located as close to the batteries as possible.  
b) a second cable from the same battery POSITIVE terminal to another  
circuit breaker in the DC disconnect.  
c) a third cable from the first circuit breaker in the DC disconnect to the  
L2 inverter POSITIVE (+) terminal.  
d) a fourth cable from the second DC disconnect to the L1 inverter  
POSITIVE (+) terminal.  
2. Connect NEGATIVE cables:  
a) one cable from the same battery NEGATIVE terminal (torque to  
manufacturer’s recommendations) to the ground bond in the DC  
disconnect.  
b) a second cable from the same battery NEGATIVE terminal (torque to  
manufacturer’s recommendations) to the ground bond in the DC discon-  
nect.  
c) a third cable from the ground bond in the DC disconnect to the L2 inverter  
NEGATIVE (–) terminal.  
d) a fourth cable from the ground bond in the DC disconnect to the  
L1 inverter NEGATIVE (–) terminal.  
3. Ensure the correct polarity of the cables with a DC voltmeter (DVM).  
4. Use an insulated 1/2 inch wrench or socket to tighten the 5/16 SAE nuts to  
10-15 foot/lb for each inverter input terminal.  
5. After tightening the connections on the batteries, apply antioxidant paste to  
the battery terminals, if desired. Do not apply antioxidant paste to the inverter  
terminals.  
6. Install the battery terminal covers (if used)—red for positive, black for  
negative—over the inverter DC terminals and secure with the screws and  
washers provided.  
2–4  
975-0059-01-01 Rev A  
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DC Wiring  
+
I
nverter  
C
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1
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ON /OF  
ME  
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Sine Wave Plus Inverter/Charger  
xantrex  
L1 Inverter  
Chassis Bonding  
Ground Lug  
2d  
+
xantrex  
I
nv  
e
r
ter Control Modul  
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2c  
DC  
SHUNT &  
NEGATIVE BUS  
GRID  
T
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A
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1
2
B
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DISCONNECT  
IN  
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Sine Wave Plus Inverter/Charger  
xantrex  
L2 Inverter  
1d  
1c  
Chassis Bonding  
Ground Lug  
ON  
ON  
Neutral-to-Ground  
Bond  
OFF  
OFF  
GROUND  
1b  
2b  
1a  
2a  
DC Conduit for  
L1 Inverter  
DC Conduit  
L2 Inverter  
To primary  
Earth/ground  
connections  
Series String 1  
+
+
+
+
12 Volt  
Battery  
200 Ah  
24 Vdc/200 Ah  
12 Volt  
Battery  
200 Ah  
Series-strings  
wired in Parallel  
24 Vdc/400 Ah  
Series String 2  
24 Vdc/200 Ah  
12 Volt  
Battery  
200 Ah  
12 Volt  
Battery  
200 Ah  
Figure 2-3 DC Connections for Dual Inverters, Series-stacked  
975-0059-01-01 Rev A  
2–5  
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Installation  
AC Wiring - General  
Be sure to use the recommended wire and disconnect size as recommended in the  
Owner’s Manual for the Sine Wave Plus Inverter.  
WARNING  
Before connecting any AC wiring, ensure that there is no DC energy accessible by the  
inverter by opening the DC disconnect switch(es).  
Inverter AC Distribution Panel (Sub-Panel) Wiring (if used)  
An Inverter AC Distribution Panel (referred to here as the inverter panel) and AC  
conduit must be installed before AC output wiring is connected to the dual  
inverters. The inverter panel is a sub-panel to the main utility panel.  
Install the Inverter AC Distribution Panel and conduit as follows:  
1. Determine the location for the Inverter AC Distribution Panel (i.e., the  
sub-panel) and install it according to the manufacturer’s directions.  
2. Install an AC conduit to the inverter panel and the inverter.  
3. Determine which circuits the inverter will power and install the appropriate  
circuit breakers into the inverter panel.  
4. For On-Grid systems, remove wires for circuits to be backed up from the main  
utility panel and install then in the new inverter (sub) panel.  
5. Install a double pole 60-amp maximum (disconnect) main circuit breaker in  
the inverter panel: one for each leg of the circuit for L1 and L2.  
6. Verify that under no circumstances can utility power or generator power  
energize the inverter panel directly while the inverter also energizes the  
inverter panel.  
WARNING: Shock Hazard  
Verify that only one neutral/ground bond exists in the system. Having more than one  
neutral to ground bond in a system may create a shock hazard and cause some sensitive  
equipment to malfunction.  
On-Grid systems always have a ground-to-neutral bond provided by the utility meter or  
service entrance, therefore do not need a ground-to-neutral bond made in the inverter  
panel. Remove it if present in the sub-panel.  
2–6  
975-0059-01-01 Rev A  
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AC Wiring - General  
Neutral Bonding  
The HOT output of each inverter provides 120 Vac to neutral. The voltage  
between the HOT outputs from the L1 and L2 inverter is 240 Vac when the ISC-S  
cable is used.  
When using a series-stacked, inverter configuration, it is important to provide a  
neutral bond between both inverters. Accomplish this bond by establishing an  
inverter-to-inverter neutral bond.  
Keep the neutral bonding jumper as short as possible to provide a better AC “zero  
volt” reference for each inverter to measure AC voltages from, as well as saving  
on wire. The neutral bond wire must be the same gauge as the other AC wires  
attached to the inverter.  
Grounding  
Ensure all components are grounded properly for safety and for code-compliance.  
WARNING: Hazardous Voltage  
When stacking inverters, ensure the chassis of each inverter is connected to the same  
common ground (i.e., in the utility or inverter panels); otherwise a hazardous voltage may  
be present between the chasses.  
975-0059-01-01 Rev A  
2–7  
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Installation  
AC Wiring - Specific  
The following AC connections are specific to installing the Sine Wave Plus  
Inverter/chargers in a series-stacked configuration for off-grid and on-grid  
applications.  
Off-Grid AC Wiring for Sine Wave Plus Inverters  
The following steps are illustrated in Figure 2-4.  
To connect the AC wiring for an off-grid application using Sine Wave Plus  
Inverters:  
Grounding  
1. Connect GROUND (green) wires:  
a) from the primary earth/ground to the AC distribution panel,  
b) from the L1 inverter AC ground bar to the inverter panel ground bar,  
c) from the L2 inverter AC ground bar to the inverter panel ground bar.  
2. Connect NEUTRAL (white) wires:  
Neutral Bonds  
a) from the NEUTRAL bus in the inverter panel, to the ground bar in the  
inverter panel, (Neutral-to-Ground Bond),  
b) from the L1 inverter NEUTRAL OUT terminal, to the L2 inverter NEUTRAL  
2 terminal. (Inverter-to-inverter neutral bond),  
c) from the L2 inverter NEUTRAL OUT terminal to the inverter panel  
NEUTRAL bus. (Common neutral bond in inverter panel).  
Inverter to AC  
3. Connect a HOT wire:  
Distribution Panel  
a) (black) from the L1 inverter AC HOT OUTPUT (120 Vac) to the inverter  
panel L1 terminal,  
b) (red) from the L2 inverter AC HOT OUTPUT (120 Vac) to the inverter  
panel L2 terminal.  
4. Torque all inverter terminal block connections to 25 inch-pounds.  
2–8  
975-0059-01-01 Rev A  
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AC Wiring - Specific  
Sine Wave Plus  
Inverter/Charger  
LEGEND  
GROUND  
NEUTRAL  
HOT L1  
AC TERMINAL  
BLOCK  
HOT L2  
AC  
GROUND  
BAR  
(inside)  
(L1)  
1b  
3a  
Sine Wave Plus  
Inverter/Charger  
2b  
AC TERMINAL  
BLOCK  
AC  
GROUND  
BAR  
(inside)  
(L2)  
AC Distribution Panel  
(Inverter Panel)  
3a  
3b  
120/240 Vac  
1c  
L1  
L2  
NEUTRAL  
3b  
2c  
2a  
GROUND  
To AC Loads  
To AC Loads  
1b  
1c  
NEUTRAL/  
GROUND BOND  
1a  
To primary  
Earth/ground  
connections  
Figure 2-4 AC Wiring for Series-stacked SW Plus Inverters Off Grid  
975-0059-01-01 Rev A  
2–9  
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Installation  
On-Grid AC Wiring for Sine Wave Plus Inverters  
Prepare the AC wiring as follows for an on-grid application using series-stacked,  
Sine Wave Plus Inverter/chargers. The following steps are illustrated in  
Grounding  
1. Connect GROUND (green) wires:  
a) from the primary earth/ground to the main utility panel,  
b) from the main utility panel to the AC distribution panel (Sub-panel),  
c) from the L1 inverter AC ground bar to the utility panel ground bar,  
d) from the L2 inverter AC ground bar to the utility panel ground bar.  
2. Connect NEUTRAL (white) wires:  
Neutral Bonds  
a) from the Neutral bus in the utility panel to the ground bar in the utility  
1
panel. (Neutral-to-ground bond),  
b) from the L1 inverter NEUTRAL OUT terminal to the L2 inverter  
NEUTRAL 2 terminal (Interter-to-inverter neutral bond),  
c) from the L1 inverter NEUTRAL OUT terminal to the utility or utility panel  
neutral bus (Common neutral bond in utility panel),  
d) from the L2 inverter NEUTRAL OUT terminal to the AC distribution panel  
neutral bus (Common neutral bond in sub-panel),  
Inverter to AC  
3. Connect HOT wires:  
Distribution Panel  
a) (black) from the L1 inverter AC HOT OUTPUT (120 Vac) to the inverter  
panel L1 terminal.  
b) (red) from the L2 inverter AC HOT OUTPUT (120 Vac) to the inverter  
panel L2 terminal.  
Inverter to Utility  
Panel  
4. Connect HOT wires:  
a) (black) from the utility panel HOT L1 terminal to the L1 inverter’s AC1  
GRID terminal.  
b) (red) from the utility panel HOT L2 terminal to the L2 inverter’s AC1  
GRID terminal.  
5. Torque all inverter terminal block connections to 25 inch-pounds.  
1.This connection may already exist from the original installation of AC service to the  
building.  
2–10  
975-0059-01-01 Rev A  
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AC Wiring - Specific  
Main Utility Panel  
LEGEND  
120/240 Vac Panel  
GROUND  
L1  
L2  
NEUTRAL  
HOT L1  
NEUTRAL/GROUND  
BOND  
HOT L2  
NEUTRAL  
Sine Wave Plus  
Inverter/Charger  
L1  
L2  
4a  
4b  
2c  
2a  
GROUND  
AC TERMINAL  
BLOCK  
AC  
GROUND  
BAR  
(inside)  
1a  
1b  
(L1)  
1c  
1d  
To primary  
Earth/ground  
connections  
3a  
4a  
Sine Wave Plus  
Inverter/Charger  
2b  
AC TERMINAL  
BLOCK  
AC Distribution Panel  
AC  
GROUND  
BAR  
(Sub-panel)  
(inside)  
(L2)  
120/240 Vac  
3a  
3b  
1d  
L1  
L2  
3b  
4b  
NEUTRAL  
2d  
To AC Loads  
GROUND  
To AC Loads  
1b  
Figure 2-5 AC Wiring for Series-stacked SW Plus Inverters OnGrid  
975-0059-01-01 Rev A  
2–11  
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Installation  
Generator AC Wiring to Series-stacked Inverters  
The following wiring diagrams show the AC wiring from an AC generator to the  
inverters.  
The following procedures are illustrated in Figure 2-6.  
Ensure that an inverter-to-inverter neutral bond is in place  
before proceeding with this procedure.  
With a generator  
disconnect switch  
To install the AC wiring from a generator with a (GDS):  
1. Connect GROUND (green) wires:  
a) from the generator GROUND to the generator disconnect switch GROUND  
terminal,  
b) from the generator disconnect switch GROUND to the AC Ground bar in  
the utility panel*.  
2. Connect NEUTRAL (white) wires:  
a) from the generator NEUTRAL to the GDS NEUTRAL terminal,  
b) from the generator disconnect switch NEUTRAL to the L1 INVERTER  
NEUTRAL 2 terminal.  
3. Connect HOT (L1- black) wires:  
a) from the generator L1 GEN HOT OUT to the GDS L1 HOT terminal,  
b) from the generator disconnect switch L1 HOT to the L1 INVERTER AC2  
GEN terminal.  
4. Connect HOT (L2 - red) wires:  
a) from the generator L2 HOT OUT to the generator disconnect switch  
L2 HOT terminal,  
b) from the generator disconnect switch L2 HOT to the L2 INVERTER AC2  
GEN terminal.  
5. Torque all inverter terminal block connections to 25 inch-pounds.  
Important: *If this is an off-grid installation, then all connections that would normally  
go to the Main Utility Panel should be routed to the AD Distribution Panel instead.  
2–12  
975-0059-01-01 Rev A  
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AC Wiring - Specific  
Main Utility  
Panel  
LEGEND  
120/240 Vac Panel  
GROUND  
L1  
L2  
NEUTRAL  
HOT L1  
NEUTRAL/GROUND  
BOND  
HOT L2  
NEUTRAL  
Sine Wave Plus  
Inverter/Charger  
L1  
L2  
GROUND  
AC TERMINAL  
BLOCK  
AC  
GROUND  
BAR  
(inside)  
(L1)  
1b  
To primary  
Earth/ground  
connections  
2b  
3b  
4b  
2a  
N
G
Generator  
Disconnect  
Switch  
L1  
L2  
Sine Wave Plus  
Inverter/Charger  
(optional)  
3a  
1a  
4a  
GROUND  
NEUTRAL  
Generator  
120/240 Vac  
L1 L2  
GEN HOT OUT  
AC TERMINAL  
BLOCK  
AC  
GROUND  
AC Distribution Panel  
BAR  
(inside)  
(L2)  
(Sub-panel)  
120/240 Vac  
L1  
L2  
NEUTRAL  
To AC Loads  
GROUND  
To AC Loads  
Figure 2-6 Generator Wiring to Series-stacked SW Plus Inverters  
975-0059-01-01 Rev A  
2–13  
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Installation  
Wiring for a 240 Vac-Only Input Source  
A 240 Vac source does not allow for the connection to the input of a 120 Vac  
inverter as no neutral line is supplied from the utility or generator. In order to use  
stacked inverters, a neutral line must be added by using a center-tapped  
autotransformer (such as a T240) on the inverter’s input. This will create the  
necessary neutral return line for the inverters, and half the voltage for each  
inverter to 120 Vac. The output of the inverter supplies both 120 and 240 Vac to  
the loads.  
The ISC-S cable and autotransformer (capable of handling the system’s power  
requirements) are required in this configuration..  
To wire the inverters for a 240-Vac only input source:  
1. Run GROUND wires (green):  
a) from the AC Distribution Panel to the primary earth/ground connection.  
b) from the generator ground to the AC Distribution Panel ground.  
c) from the ground terminal in the Autotransformer to the AC Distribution  
Panel.  
d) from the AC Distribution Panel to the Ground bar in the L1 inverter.  
e) from the AC Distribution Panel to the Ground bar in the L2 inverter.  
2. Run NEUTRAL wires (white):  
a) from the center-tapped neutral connection in the autotransformer to the  
NEUTRAL 1 terminal in the L1 inverter.  
b) from the center-tapped neutral connection in the autotransformer to the  
NEUTRAL 1 terminal in the L2 inverter.  
c) from the NEUTRAL OUT on the L1 inverter to the NEUTRAL 2  
terminal on the L2 inverter.  
d) from the Neutral OUT on the L2 inverter to the Neutral terminal in the  
AC Distribution Panel.  
3. Run HOT wires:  
a) (black) from the L1 Output in the generator to the L1 terminal in the  
Autotransformer.  
b) (black) from the L1 output terminal in the Autotransformer to the  
AC2 GEN terminal in the L1 inverter.  
c) (black) from the INV OUT terminal in the L1 inverter to the L1 input  
terminal in the AC Distribution Panel.  
d) (red) from the L2 Output in the generator to the L2 terminal in the  
Autotransformer.  
e) (red) from the L2 output terminal in the Autotransformer to the AC2 GEN  
terminal in the L2 inverter.  
f) (red) from the INV OUT terminal in the L2 inverter to the L2 input  
terminal in the AC Distribution Panel.  
4. Torque all inverter terminal block connections to 25 inch-pounds.  
2–14  
975-0059-01-01 Rev A  
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AC Wiring - Specific  
LEGEND  
Sine Wave Plus  
Inverter/Charger  
GROUND  
NEUTRAL  
HOT L1  
HOT L2  
AC TERMINAL  
BLOCK  
AC  
GROUND  
BAR  
Auto-transformer  
(L1)  
(with center-tapped neutral-out)  
(inside)  
L1  
1d  
GROUND  
3b  
1b  
L1  
L2  
3a  
GEN HOT  
OUT  
2a  
Neutral  
3d  
3e  
L2  
Generator  
240 Vac - ONLY  
Ground  
2c  
3c  
1c  
Sine Wave Plus  
Inverter/Charger  
2b  
AC TERMINAL  
BLOCK  
AC  
GROUND  
BAR  
(L2)  
(inside)  
AC Distribution Panel  
(Inverter Panel)  
3c  
3f  
120/240 Vac  
L1  
L2  
1e  
NEUTRAL  
3f  
2d  
GROUND  
To AC Loads  
To AC Loads  
1d  
1a  
NEUTRAL/GROUND  
BOND  
1c  
1b  
To primary Earth/  
ground connections  
Figure 2-7 AC Wiring for a 240 Vac-Only Input Source  
975-0059-01-01 Rev A  
2–15  
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Installation  
Connecting the ISC-S Cable  
The ISC-S Cable connects to the Stacking Port on the AC end of the Sine Wave  
Plus Inverter/charger. The Stacking Port is a 25-pin receptacle for the 25-pin  
D-connector on the ISC-S Cable. Once the connector is in place, it is secured by  
two screws on the sides of the connector.  
Align the head of the connector  
Gently tighten these two screws to  
with the Stacking Port on the  
secure in place.  
inverter and insert into the port.  
Figure 2-8 The 25-pin D-connector on the ISC-S Cable  
Stacking Port  
Figure 2-9 Stacking Port Locations on SW Plus Inverters  
To connect the ISC-S cable:  
1. Orient the 25-pin D-connector to align with the Stacking Port on the Inverter  
and gently press the connector into the port. Use caution not to bend the pins  
inside the connector head.  
2. Tighten the screws on the connector to secure the cable to the port.  
3. Connect the other end of the ISC-S cable to the second inverter’s Stacking  
Port as instructed in step 1 and 2.  
2–16  
975-0059-01-01 Rev A  
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Connecting the ISC-S Cable  
Connect one end of ISC-S  
Cable to the Stacking Port  
of the L1 inverter.  
Connect the other end of  
ISC-S Cable to the Stacking  
Port of the L2 inverter.  
Figure 2-10 The ISC-S Cable Connected to Dual Sine Wave Plus Inverters  
CAUTION; Damage to Loads  
Until the units are tested, do not connect any loads to the inverters. Proceed to the next  
chapter for Start up and Functional Testing Procedures.  
975-0059-01-01 Rev A  
2–17  
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2–18  
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Operation  
3
Chapter 3, “Operation”contains information on startup and functional  
testing procedures for series-stacked Sine Wave Plus inverters.  
The following topics are covered in this chapter.  
For this topic:  
See:  
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Operation  
Start-up and Testing  
Stacked inverters must operate together in order to provide the 120/240 Vac to the  
loads. The ISC-S cable ensures the output from each inverter is 180 degrees  
out-of-phase for operating 240 Vac loads.  
To start up and test the inverters:  
1. Ensure the circuit breakers on all AC sources (utility or generator, if any)  
feeding the inverters are OFF.  
2. Ensure the circuit breakers in the AC distribution panel (sub-panel) are OFF.  
3. Switch ON both inverters. The inverters should be providing 120/240 Vac to  
the AC distribution panel.  
4. In the AC distribution panel, use an AC voltmeter and measure the voltage  
between the L1 (HOT) terminal and the neutral bus. This voltage should be  
120 Vac (± 3%). See Figure 3-1 for testpoint locations.  
5. In the AC distribution panel, use an AC voltmeter and measure the voltage  
between the L2 (HOT) terminal and the neutral bus. This voltage should be  
120 Vac (± 3%). See Figure 3-1 for testpoint locations.  
6. In the AC distribution panel, measure the voltage between the L1 (HOT) and  
L2 (HOT) terminals. This voltage should be 240 Vac (± 3%). See Figure 3-1  
for testpoint locations.  
7. If all voltages/tests are correct,  
a) switch on the circuit breakers in the AC distribution panel, and  
b) switch on the generator or utility circuit breakers feeding the inverters.  
8. Verify the inverters are charging the batteries and powering the AC  
distribution panel.  
9. Switch both inverters OFF and open the circuit breakers to ensure all AC and  
DC power is turned OFF to the inverters.  
10. Replace all covers and panels on the inverters and sub-panel.  
11. The series-stacked inverter system is now tested and ready for use.  
If the inverters are not operating properly, please refer to the Sine Wave Plus  
Operator’s Manual for setup and troubleshooting information.  
3–2  
975-0059-01-01 Rev A  
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Start-up and Testing  
LEGEND  
GROUND  
NEUTRAL  
HOT L1  
HOT L2  
AC Distribution Panel  
(Sub-panel)  
To L1 Inverter  
120/240 Vac  
6
L1  
L2  
NEUTRAL  
5
4
To L2 Inverter  
To L2 Inverter  
To 120 Vac  
Loads  
GROUND  
To 240 Vac  
Loads  
To Main Utility  
Panel Ground  
Figure 3-1 Testpoints for Confirming Voltages  
975-0059-01-01 Rev A  
3–3  
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Operation  
Setting Changes  
When operating a Sine Wave Plus in a series-stacked configuration, the following  
settings must be changed for proper operation.  
See the Owner’s Manual for the Sine Wave Plus for detailed instructions on  
accessing and changing the settings using the Inverter Control Module (ICM) on  
the inverter.  
Automatic and Manual Generator Control  
When multiple inverters are used with a generator, the inverter connected to the  
generator via the Generator Start Module (GSM) is designated as the “generator  
controlling” inverter. The most efficient battery charging is achieved by setting  
the charging parameters of each inverter slightly differently.  
Bulk and Float Charging Parameters  
Change the Bulk and Float Charging settings as follows:  
Set the 12B BULK VOLTS DC to the same setting on both inverters.  
Set the 12C FLOAT VOLTS DC to the same setting on both inverters.  
On the non-generator-controlling inverter (the inverter not connected to a  
GSM), set the charging time for a shorter period than on the generator  
controlling inverter. This is accomplished by setting the 12F BULK DONE  
AMPS to a higher setting. If the 12F BULK DONE AMPS is set to zero (0), then  
the 12H MAX BULK/EQ Timer h:m should be set to a shorter time period on  
the non-generator-controlling inverter.  
Equalize Charging  
Change the Equalize Charging settings as follows:  
Set both inverters to the same 12D EQUALIZE VOLTS DC setting.  
Set the 12G EQ VDC DONE TIMER H:M on the “generator controlling” inverter  
to a shorter equalize time.  
To start an Equalize charge (manually or automatically), set both inverters to EQ  
by scrolling to 01B EQ CHARGE ON/OFF and selecting ON.  
During the equalize charge, the Bulk LED will slowly flash on each inverter,  
indicating the EQ selection has been enabled.  
3–4  
975-0059-01-01 Rev A  
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Setting Changes  
Automatic Generator Equalize Charging  
If the inverters are set to automatically charge the batteries using the generator, the  
equalize process will begin during the next, automatically started, generator run  
period. When the equalizing process has completed, the generator automatically  
stops and the cursor returns to the OFF position in the 01B EQ CHARGE menu  
item on the generator-controlling inverter. The non-generator-controlling inverter  
must be set from EQ to OFF from the 01B EQ CHARGE menu item or it will start  
another equalize charge the next time the generator is started.  
Manual Equalize Charging  
If the batteries were equalized using a manually started generator or from the  
utility grid, the FLOAT LED illuminates, indicating the equalization process is  
complete. Set the cursor to OFF on both inverters under the 01B EQ CHARGE  
menu item when the equalization process is complete.  
Important: If using multiple battery temperature sensors (BTS) ensure they are all  
connected to the same location (battery).  
975-0059-01-01 Rev A  
3–5  
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3–6  
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Warranty and Return Information  
Warranty  
What does this warranty cover? This Limited Warranty is provided by Xantrex Technology, Inc. ("Xantrex")  
and covers defects in workmanship and materials in your Inverter Stacking Control – Series Cable. This warranty  
period lasts for two (2) years from the date of purchase at the point of sale to you, the original end user customer. You  
require proof of purchase to make warranty claims.  
This Limited Warranty is transferable to subsequent owners but only for the unexpired portion of the Warranty  
Period.Subsequent owners also require proof of purchase.  
What will Xantrex do?  
Xantrex will, at its option, repair or replace the defective product free of charge, provided that you notify Xantrex of  
the product defect within the Warranty Period, and provided that Xantrex through inspection establishes the existence  
of such a defect and that it is covered by this Limited Warranty.  
Xantrex will, at its option, use new and/or reconditioned parts in performing warranty repair and building  
replacement products. Xantrex reserves the right to use parts or products of original or improved design in the repair  
or replacement. If Xantrex repairs or replaces a product, its warranty continues for the remaining portion of the  
original Warranty Period or 90 days from the date of the return shipment to the customer, whichever is greater. All  
replaced products and all parts removed from repaired products become the property of Xantrex.  
Xantrex covers both parts and labor necessary to repair the product, and return shipment to the customer via a  
Xantrex-selected non-expedited surface freight within the contiguous United States and Canada. Alaska and Hawaii  
are excluded. Contact Xantrex Customer Service for details on freight policy for return shipments outside of the  
contiguous United States and Canada.  
How do you get service? If your product requires troubleshooting or warranty service, contact your merchant. If  
you are unable to contact your merchant, or the merchant is unable to provide service, contact Xantrex directly at:  
Telephone: 1 800 670 0707 (toll free North America)  
1 360 925 5097 (direct)  
Fax:  
1 800 994 7828 (toll free North America)  
1 360 925 5143 (direct)  
Email:  
Direct returns may be performed according to the Xantrex Return Material Authorization Policy described in your  
product manual. For some products, Xantrex maintains a network of regional Authorized Service Centers. Call  
Xantrex or check our website to see if your product can be repaired at one of these facilities.  
What proof of purchase is required? In any warranty claim, dated proof of purchase must accompany the  
product and the product must not have been disassembled or modified without prior written authorization by Xantrex.  
Proof of purchase may be in any one of the following forms:  
The dated purchase receipt from the original purchase of the product at point of sale to the end user, or  
The dated dealer invoice or purchase receipt showing original equipment manufacturer (OEM) status, or  
The dated invoice or purchase receipt showing the product exchanged under warranty  
975-0059-01-01 Rev A  
WA–1  
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Warranty and Return  
What does this warranty not cover? This Limited Warranty does not cover normal wear and tear of the  
product or costs related to the removal, installation, or troubleshooting of the customer's electrical systems. This  
warranty does not apply to and Xantrex will not be responsible for any defect in or damage to:  
a) the product if it has been misused, neglected, improperly installed, physically damaged or altered, either inter-  
nally or externally, or damaged from improper use or use in an unsuitable environment;  
b) the product if it has been subjected to fire, water, generalized corrosion, biological infestations, or input voltage  
that creates operating conditions beyond the maximum or minimum limits listed in the Xantrex product specifi-  
cations including high input voltage from generators and lightning strikes;  
c) the product if repairs have been done to it other than by Xantrex or its authorized service centers (hereafter  
"ASCs");  
d) the product if it is used as a component part of a product expressly warranted by another manufacturer;  
e) the product if its original identification (trade-mark, serial number) markings have been defaced, altered, or  
removed.  
Disclaimer  
Product  
THIS LIMITED WARRANTY IS THE SOLE AND EXCLUSIVE WARRANTY PROVIDED BY XANTREX IN CONNECTION WITH YOUR  
XANTREX PRODUCT AND IS, WHERE PERMITTED BY LAW, IN LIEU OF ALL OTHER WARRANTIES, CONDITIONS,  
GUARANTEES, REPRESENTATIONS, OBLIGATIONS AND LIABILITIES, EXPRESS OR IMPLIED, STATUTORY OR OTHERWISE IN  
CONNECTION WITH THE PRODUCT, HOWEVER ARISING (WHETHER BY CONTRACT, TORT, NEGLIGENCE, PRINCIPLES OF  
MANUFACTURER'S LIABILITY, OPERATION OF LAW, CONDUCT, STATEMENT OR OTHERWISE), INCLUDING WITHOUT  
RESTRICTION ANY IMPLIED WARRANTY OR CONDITION OF QUALITY, MERCHANTABILITY OR FITNESS FOR A PARTICULAR  
PURPOSE. ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TO THE EXTENT  
REQUIRED UNDER APPLICABLE LAW TO APPLY TO THE PRODUCT SHALL BE LIMITED IN DURATION TO THE PERIOD  
STIPULATED UNDER THIS LIMITED WARRANTY.  
IN NO EVENT WILL XANTREX BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, INCIDENTAL OR CONSEQUENTIAL  
DAMAGES, LOSSES, COSTS OR EXPENSES HOWEVER ARISING WHETHER IN CONTRACT OR TORT INCLUDING WITHOUT  
RESTRICTION ANY ECONOMIC LOSSES OF ANY KIND, ANY LOSS OR DAMAGE TO PROPERTY, ANY PERSONAL INJURY, ANY  
DAMAGE OR INJURY ARISING FROM OR AS A RESULT OF MISUSE OR ABUSE, OR THE INCORRECT INSTALLATION,  
INTEGRATION OR OPERATION OF THE PRODUCT.  
Exclusions  
If this product is a consumer product, federal law does not allow an exclusion of implied warranties. To the extent  
you are entitled to implied warranties under federal law, to the extent permitted by applicable law they are limited to  
the duration of this Limited Warranty. Some states and provinces do not allow limitations or exclusions on implied  
warranties or on the duration of an implied warranty or on the limitation or exclusion of incidental or consequential  
damages, so the above limitation(s) or exclusion(s) may not apply to you. This Limited Warranty gives you specific  
legal rights. You may have other rights which may vary from state to state or province to province.  
Warning: Limitations On Use  
Please refer to your product manual for limitations on uses of the product.  
SPECIFICALLY, PLEASE NOTE THAT THE INVERTER STACKING CONTROL – SERIES CABLE SHOULD NOT BE USED IN  
CONNECTION WITH LIFE SUPPORT SYSTEMS OR OTHER MEDICAL EQUIPMENT OR DEVICES. WITHOUT LIMITING THE  
GENERALITY OF THE FOREGOING, XANTREX MAKES NO REPRESENTATIONS OR WARRANTIES REGARDING THE USE OF THE  
XANTREX INVERTER STACKING CONTROL – SERIES CABLE IN CONNECTION WITH LIFE SUPPORT SYSTEMS OR OTHER  
MEDICAL EQUIPMENT OR DEVICES.  
Please note that the Inverter Stacking Control – Series Cable is not intended for use as an uninterruptible power  
supply and Xantrex makes no warranty or representation in connection with any use of the product for such purposes.  
WA–2  
975-0059-01-01 Rev A  
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Warranty and Return  
Return Material Authorization Policy  
Before returning a product directly to Xantrex you must obtain a Return Material Authorization (RMA) number and  
the correct factory "Ship To" address. Products must also be shipped prepaid. Product shipments will be refused and  
returned at your expense if they are unauthorized, returned without an RMA number clearly marked on the outside of  
the shipping box, if they are shipped collect, or if they are shipped to the wrong location.  
When you contact Xantrex to obtain service, please have your instruction manual ready for reference and be prepared  
to supply:  
The serial number of your product  
Information about the installation and use of the unit  
Information about the failure and/or reason for the return  
A copy of your dated proof of purchase  
Record these details in on page WA–4.  
Return Procedure  
1. Package the unit safely, preferably using the original box and packing materials. Please ensure that your product  
is shipped fully insured in the original packaging or equivalent. This warranty will not apply where the product is  
damaged due to improper packaging.  
2. Include the following:  
The RMA number supplied by Xantrex Technology, Inc. clearly marked on the outside of the box.  
A return address where the unit can be shipped. Post office boxes are not acceptable.  
A contact telephone number where you can be reached during work hours.  
A brief description of the problem.  
3. Ship the unit prepaid to the address provided by your Xantrex customer service representative.  
If you are returning a product from outside of the USA or Canada In addition to the above, you MUST  
include return freight funds and are fully responsible for all documents, duties, tariffs, and deposits.  
If you are returning a product to a Xantrex Authorized Service Center (ASC) A Xantrex return  
material authorization (RMA) number is not required. However, you must contact the ASC prior to returning the  
product or presenting the unit to verify any return procedures that may apply to that particular facility.  
Out of Warranty Service  
If the warranty period for your Inverter Stacking Control – Series Cable has expired, if the unit was damaged by  
misuse or incorrect installation, if other conditions of the warranty have not been met, or if no dated proof of purchase  
is available, your inverter may be serviced or replaced for a flat fee.  
To return your Inverter Stacking Control – Series Cable for out of warranty service, contact Xantrex Customer  
Service for a Return Material Authorization (RMA) number and follow the other steps outlined in “Return  
Payment options such as credit card or money order will be explained by the Customer Service Representative. In  
cases where the minimum flat fee does not apply, as with incomplete units or units with excessive damage, an  
additional fee will be charged. If applicable, you will be contacted by Customer Service once your unit has been  
received.  
975-0059-01-01 Rev A  
WA–3  
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Warranty and Return  
Information About Your System  
As soon as you open your Inverter Stacking Control – Series Cable package, record the following information and be  
sure to keep your proof of purchase.  
_________________________________  
_________________________________  
Purchased From  
Purchase Date  
If you need to contact Customer Service, please record the following details before calling. This information will help  
our representatives give you better service.  
__________________________________  
__________________________________  
__________________________________  
__________________________________  
__________________________________  
__________________________________  
__________________________________  
__________________________________  
__________________________________  
Type of installation  
Length of time inverter has been installed  
Battery/battery bank size  
Battery type (e.g. flooded, sealed gel cell, AGM)  
DC wiring size and length  
Alarm sounding?  
Description of indicators on front panel  
Appliances operating when problem occurred  
Description of problem  
______________________________________________________________________________________  
______________________________________________________________________________________  
WA–4  
975-0059-01-01 Rev A  
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Index  
240 Vac-Only Input Source 2–14  
Off-Grid AC Wiring 2–8  
Off-Grid Applications with Series-Stacked Inverters  
On-Grid AC Wiring 2–10  
On-Grid Applications with Series-stacked Inverters  
Abbreviations and Acronyms iv  
AC Wiring - General 2–6  
AC Wiring - Specific 2–8  
proof of purchase WA–4  
purchase date WA–4  
Battery Requirements 2–2  
Battery-Bank Configuration 2–2  
Bulk and Float Charging Parameters 3–4  
Stacking Inverters 1–2  
Start-up 3–2  
Sub-Panel 2–6  
Connecting the Battery Bank 2–4  
Customer Service  
preparing to call WA–4  
Testing 3–2  
testpoints 3–2  
DC Wiring 2–2  
warranty  
out of warranty service WA–3  
terms and conditions WA–1  
Generator AC Wiring 2–12  
Generator Control 3–4  
Grounding 2–3, 2–7  
Xantrex  
web site iv  
Information about Your System form WA–4  
inverter  
purchase date WA–4  
serial number WA–4  
Inverter Stacking Control – Series (ISC-S) cable 1–5  
ISC-S Cable 1–5  
ISC-S Cable Connections 2–16  
Multi-wire branch circuits 1–2  
Neutral Bonding 2–7  
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IX-2  
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Xantrex Technology Inc.  
1 800 670 0707 Tel toll free NA  
1 360 925 5097 Tel direct  
1 800 994 7828 Fax toll free NA  
1 360 925 5143 Fax direct  
PC Printed in USA  
PN 975-0059-01-01  
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