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STACKING OPTIONS
OutBack Grid-Interactive FXs can be stacked in Classic Series only.
CLASSIC STACKING
• Two FXs are wired to two 120 VAC output legs producing 240 VAC between them.
• Each FX powers one leg and acts independently of the other, but both combine when 240 VAC is
required for a load.
• The AC input must be 240 split phase VAC.
3 kW 120 VAC
3 kW 120 VAC
3 kW
120 VAC
Leg 2
LOAD
3 kW
120 VAC
Leg 2
6 kW
240 VAC
Leg 1
and
Leg 2
or
STACKING AND ASSIGNING FX STATUS
Stacking Phases/Assigning FX Status (in order as they appear on the MATE):
1. Master
2. Classic Slave
Use the MATE to establish the order or hierarchy of all the system FXs by designating one as the Master
and one as the Classic Slave.
1. Master
• This is the default ranking of every FX. It applies to one-phase and two-phase systems.
• One Master FX is established for every multiple FX system.
• Each Grid-Interactive FX can be a Master as long as each is connected to a separate AC output leg
(both HOT and NEUTRAL)
• If one Grid-Interactive FX is designated as the system’s only Master, it is always considered to be the
Leg 1 phase.
2. Classic Slave
• Classic Slave is the designation of the second FX in a two-inverter, split-phase system that produces
240 VAC without using an FW-X240 Auto Transformer.
• This FX is plugged into Port 02 of the HUB and is considered to be the L2 phase.
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