Stacking Configurations; Parallel Stacking (Dual-Stack And Larger); Three-Phase Stacking; Figure 11 Example Of Parallel Stacking Arrangement (Three Inverters) - Outback Power Systems FXR2012E Operator's Manual

Operation

Stacking Configurations

Each inverter must be assigned a particular mode in the Stack Mode menu. In the figures for each
configuration below, the mode names are shown next to each inverter.
For example, Figure 11 shows Master for the first inverter in a parallel-stacked system. The remaining
inverters are designated Slave. Figure 12 and Figure 13 show Master and Slave designations for
Phases A, B, and C in three-phase systems.

Parallel Stacking (Dual-Stack and Larger)

In parallel stacking, two or more inverters are stacked to create a single, common set of AC outputs.

All inverters share a common input (AC source). The inverters run loads on a common output bus. The master
inverter provides the primary output. The slaves are connected to the same output and assist the master.

The slave outputs are controlled directly by the master and cannot operate independently.

Slave inverters can go into Power Save mode when not in use. The master will activate individual slaves
based on load demand. This reduces idle power consumption and improves system efficiency.

Up to ten inverters may be installed in a parallel arrangement.
Master
2.0 kVA 120
Figure 11

Three-Phase Stacking

In three-phase stacking, inverters create three separate 230 Vac
 The three legs operate independently of each other. The output of each inverter is 120° out of phase
from the others. Any two outputs produce 400 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. On the next page,
Figure 12 shows one inverter per phase. Figure 13 shows three inverters per phase.
 All inverters must be the same model.
4
Output voltages may vary with regional voltage standards.
44
2.0 kVA 120 Vac
Example of Parallel Stacking Arrangement (Three Inverters)
Slave
2.0 kVA 120 Vac
4
output legs in a wye configuration.
LOAD PANEL
Slave
6.0 kVA
120 Vac
900-0169-01-00 Rev A