Multiple-inverter installations (stacking), E 26), t, Operation – Outback Power Systems GS8048 Operator Manual User Manual
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Operation
26
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 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 GS8048 inverter can be stacked in parallel to increase capacity. Up to ten units can be stacked to
operate in a single system.
Stacking requires an OutBack HUB Communications Manager, as well as a MATE3 system display.
A system of four or fewer units may use the HUB4.
Systems of up to ten units require the HUB10 or HUB10.3.
All interconnections between the products are made using CAT5 non-crossover cable. (See the Radian
Series Inverter/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.
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.
Additional Ports
Port 1
MATE Port
HUB4
MATE3