Installation Manual

Installation
34 900-0197-01-00 Rev A
Parallel Stacking (Dual-Stack and Larger)
In parallel stacking, two or more inverters create a single, common 120 Vac bus.

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. The example on this page shows three inverters.
The wiring diagram on the next page shows four. All inverters must be the same model.
Figure 26 Example of Parallel Stacking Arrangement (Three Inverters)
When installing a parallel inverter system, observe the following rules.

Parallel stacking requires both a system display and a communications manager. Port assignments and jumper
positions vary with model and stacking configuration.

The inverter that is mounted physically lowest is always the master. It is the primary output. Mounting the
master below the other inverters allows the master to avoid heat buildup and remain relatively cool.

The master must be connected to communications manager port 1. It is programmed as
1-2phase Master
.
Other inverters must not be selected as master.

All other inverters, regardless of number, must be programmed as
OB Slave L1
during programming. See the
HUB Communications Manager literature for port assignments.

All overcurrent devices must be sized for 30 Aac or less. All wiring must be sized for 30 Aac or more.

All output circuit breakers must be sized appropriately for loads and inverter power.

The AC input (generator or shore power) must be 120 Vac at 60 Hz (single-phase)
6.0 kVA
120 Vac
2.0 kVA 120 Vac
2.0 kVA 120 Vac
2.0 kVA 120 Vac
LOAD
PANEL
1-2phase Master
OB Slave L1
OB Slave L1