Installation Manual

Installation
900-0168-01-00 Rev C 31
IMPORTANT:

The master inverter must always be connected to port 1 on the communications
manager. Connecting it elsewhere, or connecting a slave to port 1, will result in
backfeed or output voltage errors which will shut the system down immediately.

Installing multiple inverters without stacking them (or stacking them
incorrectly) will result in similar errors and shutdown.

Although stacking allows greater capacity, the loads, wiring, and overcurrent
devices must still be sized appropriately. Overloading may cause circuit
breakers to open or the inverters to shut down.
Stacking Configurations
Parallel Stacking (Dual-Stack and Larger)
In parallel stacking, two or more inverters create a single, common 230 Vac
4
bus.

The slave outputs are controlled directly by the master and cannot operate independently.

All inverters share a common input (AC source) and run loads on a common output.

Slave inverters can go into Silent 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 23 Example of Parallel Stacking Arrangement (Three Inverters)
When installing a parallel inverter system, observe the following rules.

Parallel stacking requires both the system display and the communications manager. See the HUB10.3
literature for any required jumper configurations.

The inverter that is mounted physically lowest is always the master and is programmed as
Master.
Mounting below the other inverters allows the master to avoid heat buildup and remain relatively cool as it
sees the greatest duty cycle.

The master must be connected to port 1 of the communications manager. Other inverters must not be
selected as master.

All slave inverters, regardless of number, should be selected as
Slave
during programming. Slaves can be
connected to any port numbered 2 and above.

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 wattage.
4
Output voltages may vary with regional voltage standards.
6.0 kVA
230 Vac
2.0 kVA 230 Vac
2.0 kVA 230 Vac
2.0 kVA 230 Vac
LOAD
PANEL
Master Slave Slave