Installation Manual

Installation
30 900-0197-01-00 Rev A
Stacking Configurations
Classic Series Stacking (Dual-Stack)
In series stacking, two inverters create two separate 120 Vac output phases. One inverter is the master.
The other is a slave that is intentionally 180° out of phase with the master. Each of these outputs can be
used to power a separate set of 120 Vac loads. Collectively they form a “split-phase” configuration which
produces 240 Vac. “Classic” series stacking is the simplest way to achieve this output.

The two outputs operate independently of each other. The 120 Vac loads on each output cannot exceed a given
inverter’s size. The second inverter cannot assist.

Only two inverters, one per output, may be classic series stacked. They must be the same model.
Figure 22 Example of Classic Series Stacking Arrangement
When installing a series inverter system, observe the following rules.

Series stacking requires both a system display and a communications manager. Port assignments and jumper
positions vary with model and stacking configuration.

The master inverter is the L1 output. It must be connected to communications manager port 1. It is
programmed as
1-2phase Master
. Other inverters must not be selected as master.

The L2 inverter must be programmed as
Classic Slave
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 120/240 Vac (split-phase).
2.0 kVA
120 Vac
4.0 kVA
240 Vac
2.0 kVA
120 Vac
2.0 kVA 120 Vac
2.0 kVA 120 Vac
LOAD PANEL
OR
1-2phase
Master
Classic
Slave