Outback FXR/VFXR Renewable Series Installation Manual
Installation
900-0166-01-00 Rev B
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
Series Stacking (Dual-Stack)
In series stacking, two inverters create two separate 120 Vac
4
output phases. One phase is the master.
The second inverter is a subphase master. It creates a 120 Vac output 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. This configuration produces 240 Vac, which can
be used to power 240 Vac loads when both inverters work together.
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 installed in a series arrangement. They must be the same model.
Figure 23 Example of Series Stacking Arrangement
When installing a series inverter system, observe the following rules.
Series stacking requires both the system display and the communications manager. See the HUB10.3
literature for any required jumper configurations.
The master must be connected to communications manager port 1. It is programmed as
Master
.
Other inverters must not be selected as master.
4 Output voltages may vary with regional voltage standards.
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
Master (L1)
L2 Phase Master