2.0 INSTALLATION
© 2001 Xantrex Technology Inc. All Rights Reserved.
P/N 975-0013-01-01 Rev B 10/01
18
Series Stacking (continued)
Main Service Panel
L1
L2
N
G
Utility L1
Neutral
N
G
Output L1
G
N
HOT
Utility L2
Neutral
N
G
Output L2
G
N
HOT
N
Stacking
Interface
Cable
HOT L1
HOT L2
N
G
240 VAC
120 VAC
120 VAC
All connections are made on
the inverter's AC terminal block.
The NEUTRAL wires together
at the inverter terminal block.
N
Figure 2-11
Series Stacked Inverters AC Wiring
240 VAC Only Source
A 240 VAC source does not allow for the connection of 120 VAC input inverters as no neutral line is supplied
from the utility. 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. A Trace Series Stacking cable (SWI) and autotransformer (capable of handling the systems power
requirements) are required in this configuration.
Wire the inverters as shown in the diagram below for 240 VAC only sources.
L1
L2
N
N
Utility L2
Neutral
Utility L1
Neutral
N
N
HOT
Main Service Panel
240 VAC Only Service
Series
Stacking
Cable
G
G
120 VAC
120 VAC
240 VAC
N
G
HOT
HOT
HOT
All Connections are
made on the inverter's
AC terminal blocks.
Output L1
Output L2
Tie Neutral wires
together at the inverter
terminal block.
L1
L2
N
N
L1
L2
Auto
Transformer
Figure 2-12
Series Stacked Inverters Connected to a 240 VAC Only Source
WARNING: WHEN STACKING INVERTERS, ALWAYS CONNECT THE CHASSIS OF EACH
INVERTER TOGETHER USING THE CHASSIS GROUND LUG; OTHERWISE, A HAZ-
ARDOUS VOLTAGE MAY BE PRESENT BETWEEN EACH CHASSIS.
