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5.11.2 PARALLEL CONFIGURATION
Important notices for parallel system:
• If utilizing the generator input (GEN), ensure that the generator is connected to all inverters in
parallel.
• If it is not possible to evenly divide solar strings per inverter, it is recommended to have more
PV strings on the master inverter.
• The values shown on the LCD of each inverter displays the individual inverter’s contribution to
the system, not the system’s total.
Before commissioning:
1. Verify that all inverters in the system are updated to the latest firmware. Please contact the
distributor to confirm the latest version.
2. Make sure the power cables and parallel communications cables have been wired correctly
and verify the DIP-switch settings are correct.
3. Ensure the LOAD breakers are o (open). Ensure there is no AC voltage present with a
multimeter before proceeding to the next step.
4. Power on the inverters.
5. Navigate to setting 21 to configure phasing.
6. Starting with the primary inverter (the inverter communicating with the battery bank), change
setting 21 to 1PH for split-phase parallel. The LCD will then switch to a secondary setting,
Parallel Phase. Set the inverter to P1 for phase 1. Repeat this step for all paralleled inverters.
7. Enable “Battery Shared” on all inverters in parallel.
8. Ensure all inverters are set to “P1” phase.
9. Ensure the battery to inverter communications cable is properly connected from master
battery to inverter.
Commissioning Steps:
1. Power on the system per the start-up sequence outlined in section 13.
2. Turn on the battery and make sure the communication works on all units.
3. Check the parallel info via the Home page on the LCD.
4. Before connecting loads to the load output terminal, check the output of L1 to N, L2 to N and L1
to L2 to ensure there is no voltage present.
5. Add some small loads to the load output and verify power output.
6. Perform a full system restart as outlined in section 13 to finish the commissioning.
If commissioning a single inverter system, ensure setting 21 is set to NoPL
(no parallel) and then finish the commissioning
To determine proper host and slave definition of the inverters, provide power to
each before turning on. Turn on the EPS Output (AC Output) on the host inverter first, to
designate it as host. Power on each inverter paralleled past the host to define them as
slaves. On the main inverter display, press “down” three times, then check the numbers
& letters in the top left. Host inverter should read “1P-H:P1: 1”, and slave should read “1P-
S:P1: “X””, with the “X” representing the number of inverters in parallel.
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