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FX Series Inverter/Charger Programming

NOTE: Please see the FX and VFX Series Inverter/Charger Installation Manual to install, wire, and

connect each FX Series Inverter/Charger. This programming manual assumes all FXs have

been installed and are ready to program according to the way they were wired. If a di erent

programming is desired, the FXs might require a di erent wiring con guration (see sample

wiring diagrams in the FX and VFX Series Inverter/Charger Installation Manual). To familiarize

yourself with the programming concepts, please read through the entire manual before

programming your system.

Up to two grid-interactive FXs, ten o -grid FXs (including export models), or three FXs in a three-
phase system can be combined and wired or “stacked” for systems requiring more power. A user’s
nal loads and power needs determine which stacking con guration will work best.
• Stacking FXs does not refer to physically placing one FX on top of another, but to how they are
wired within the system and then programmed for operation. Stacking allows all the FXs to
work together as a single system.
• Stacking assigns the FXs to power individual legs of the system and to operate at certain times;
this order is assigned using the MATE.
• PLEASE NOTE: An OutBack MATE is required to recognize and program the FXs. When multiple
FX’s are used, each needs to be assigned a status—Master or Slave.
• The Master FX is the primary and most heavily used unit. The loads and demands of the system
determine when and which Slaves are used. A Slave FX assists when the load demands are
more than the Master FX can handle alone.
• This is an orderly process as long as the user assigns each FX correctly. This is mainly a matter of
paying attention to the Port number for each FX when programming with the MATE.

Stacking Concerns

FXs should be wired and stacked appropriately to their individual power system. Problems can
occur when:
• An FX is incorrectly wired.
• An FX plugged into a HUB Port is mistakenly programmed (assigned the wrong status) or
misidenti ed.
• An easy rule to remember is any FX wired to a speci c phase or leg must be programmed to
that phase.

Stacking Options

The FX Series Inverter/Chargers can be stacked in the following con gurations (see page 7).
1. OutBack Parallel
2. Classic Series
3. OutBack Series
4. OutBack Series/Parallel
5. 3-Phase
Each stacking option has bene ts and should be chosen according to a user’s needs and individual
power system. Consult with your dealer or installer to determine what will work best for you.