SunSynk SUN-25K-SG01HP3-EU-BM2, Installer Manual

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Page | 57 Hybrid Inverter | Installer Manual
The Sunsynk inverter can be wired standalone or where more power is required it can be
connected in parallel.
The maximum number of inverters that can be paralleled in a three
phase utility grid is 10. In the case where 10 inverters are operating in parallel, one will operate
as the Master and the other ones as Slaves.
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.
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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.
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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.
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Each phase must only have one master and the others set to slave.
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Each inverter must have a unique Modbus number.
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The maximum length of the communication cables is 2 meters (do not exceed this value)
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All batteries must be connected in parallel and the MPPTs must be kept separate.
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IMPORTANT: When configuring inverters in parallel, it is important to first check
firmware versions to be all the same on all inverters. It is strongly recommended to
request firmware update on all inverters to the latest and the exact same firmware
version.
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IMPORTANT: All inverters in a parallel system must have their own isolating load
breaker before it goes to the parallel breaker to ensure while programming that the
load outputs are isolated from each other.
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Only once confirmed all inverters are programmed correctly in parallel then only the isolating
breakers can be switched on, which then feeds to the main load output breaker that feeds
the loads.
The cables have two ends, one to be specifically connected to the BMS and the
another one to be connected to the inverter, do not change it.
If the communication is not working correctly between inverters then errors will
show up on the display. In this case, please check all settings and data cable.
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The load outputs can be connected in parallel.
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The grid input can also be connected in parallel.
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You cannot connect the Aux/Gen port in parallel, because this causes a conflict
between the frequency of the generator and the frequency of the grid.