The Sunsynk parity inverter can be wired standalone or where more power is required it can be connected
in parallel either single or 3 phase configuration. The maximum number of inverters that can be paralleled
in a single phase utility grid is three (10.8kW, 16.5kW, and 26.4kW for the 3.6kW, 5.5kW, and 8.8 kW
model, respectively) and the maximum number that can be paralleled in a three phase utility grid is nine
(32.4kW, 49.5kW, and 79.2kW for the 3.6kW, 5.5kW, and 8.8 kW model, respectively).
To parallel six inverters in a three phase utility grid is necessary to set three inverters as master and three
as slaves:
Phase A: Master A and Slave A
Phase B: Master B and Slave B
Phase C: Master C and Slave C
For stability, all the batteries need to be connected in parallel. It is recommended a minimum cable size
of 50mm diameter with fuse isolators to each inverter.
Each invert will require a fuse isolator with surge protection and each group circuit will require an RCD.
If the batteries as supplying power to the main load during the outage then a change over switch will also
be required or a split load can be used.
IMPORTANT
Be careful with bus bar sizes.
The CT coils used to limit export power must only be connected to the master. Therefore, if six
inverters are paralleled, three CT coils will be required.
Connect a RJ45 communication cable between each inverter; the order is not important
since both sockets are the same, so there is no IN or OUT.
Each phase must only have one master and the others set to slave.
Each inverter must have a unique Modbus number.
Each set of inverters must be set to the same phase. For example, when paralleling three
inverters in a three phase utility grid all must be set as Master (Phase A, Phase B, Phase
C).
The maximum length of the communication cables is 2 meters (do not exceed this value)
All batteries must be connected in parallel and the MPPTs must be kept separate.
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