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Operation
3–2 975-0059-01-01 Rev A
Start-up and Testing
Stacked inverters must operate together in order to provide the 120/240 Vac to the
loads. The ISC-S cable ensures the output from each inverter is 180 degrees
out-of-phase for operating 240 Vac loads.
To start up and test the inverters:
1. Ensure the circuit breakers on all AC sources (utility or generator, if any)
feeding the inverters are OFF.
2. Ensure the circuit breakers in the AC distribution panel (sub-panel) are OFF.
3. Switch ON both inverters. The inverters should be providing 120/240 Vac to
the AC distribution panel.
4. In the AC distribution panel, use an AC voltmeter and measure the voltage
between the L1 (H
OT) terminal and the neutral bus. This voltage should be
120 Vac (± 3%). See Figure 3-1 for testpoint locations.
5. In the AC distribution panel, use an AC voltmeter and measure the voltage
between the L2 (H
OT) terminal and the neutral bus. This voltage should be
120 Vac (± 3%). See Figure 3-1 for testpoint locations.
6. In the AC distribution panel, measure the voltage between the L1 (H
OT) and
L2 (HOT) terminals. This voltage should be 240 Vac (± 3%). See Figure 3-1
for testpoint locations.
7. If all voltages/tests are correct,
a) switch on the circuit breakers in the AC distribution panel, and
b) switch on the generator or utility circuit breakers feeding the inverters.
8. Verify the inverters are charging the batteries and powering the AC
distribution panel.
9. Switch both inverters OFF and open the circuit breakers to ensure all AC and
DC power is turned OFF to the inverters.
10. Replace all covers and panels on the inverters and sub-panel.
11. The series-stacked inverter system is now tested and ready for use.
If the inverters are not operating properly, please refer to the Sine Wave Plus
Operator’s Manual for setup and troubleshooting information.