Outback FX-R Series Installation Manual

Commissioning

900-0166-01-01 Rev A

Three-Phase Stacking

In three-phase stacking, inverters create three separate 120 Vac

output phases in wye configuration.



The three phases (A, B, and C) operate independently of each other. The inverters on one phase cannot

assist another. Several inverters can be installed in parallel on each phase to power all 120 Vac loads on

each of those phases.



The output of each inverter is 120° out of phase from the others. Any two outputs produce 208 Vac

between them. The outputs can be used to power three-phase loads when all inverters work together.



Up to nine inverters, three per phase, may be installed in a three-phase arrangement. (The wiring drawing

on the next page shows only one inverter per phase.) All inverters must be the same model.

Figure 29 Example of Three-Phase Stacking Arrangement (Three Inverters)

Figure 30 Example of Three-Phase Stacking Arrangement (Nine Inverters)

Output voltages may vary with regional voltage standards.

2.0 kVA 120 Vac

2.0 kVA

120 Vac

6.0 kVA

208

2.0 kVA

120 Vac

2.0 kVA

120 Vac

LOAD PANEL

C Phase Master

B Phase Master

Master

C Phase

Master

B Phase

Master

2.0 kVA 120 Vac

Slave

6.0 kVA

120 Vac

6.0 kVA

120 Vac

6.0 kVA

120 Vac

LOAD PANEL

18.0

kVA

208 Vac