Installation Guide

Installation
900-0160-01-01 Rev B 41
Programming involves using the system display to assign a status and stacking value to the inverter
on each port. The stacking assignments can be changed at any time as long as the master is
connected to port 1.
1
The port designations for the mismatched inverters are listed here.
IMPORTANT:
 The master inverter must always be connected to port 1 on the
communications manager. 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.
 All stacked Radian inverters must have the same firmware revision. If
inverters are stacked with different firmware revisions, any unit with a revision
different from the master will not function. The system display will display the
following message:
An inverter firmware mismatch has been detected. Inverters X, Y, Z
1
are
disabled. Visit www.outbackpower.com for current inverter firmware.
 Installing multiple inverters without stacking them (or stacking them
incorrectly) will result in similar errors and shutdown.
 Neither the GS8048A nor the GS4048A can stack with the previous model
GS8048. The GS8048 can share a HUB product with the others if it is
wired independently.
 The GS8048A can be stacked with the GS4048A using HUB products.
To optimize the
Power Save
function, GS4048A inverters should have
higher rank numbers than any GS8048A inverter. This is true regardless
of the quantity of either model. In addition, the GS4048A should not be
the master inverter in a mixed system. See page 46 for additional discussion
of
Power Save
.
 Although stacking allows greater capacity, the loads, wiring, and overcurrent
devices must still be sized appropriately. Overloading may cause circuit
breakers to open or the inverters to shut down.
 An AC source should provide input to all inverters on all phases
.