THREE PHASE HI 25/50kW | Installer Manual20
Grid and Backup Load Connection
Before connecting to the grid, please install a separate AC breaker between the inverter and the grid. Also,
it is recommended that installs an AC breaker between the backup load and inverter. This will ensure that
the inverter can be securely disconnected during maintenance and fully protected from overcurrent. For the
25/30/40/50KW model, the recommended AC breaker for the backup load is 180A.
There are three terminal blocks marked as GRID, LOAD, and GEN. Please do not confuse input and output
connections. External AC SPD is compulsory on all Sunsynk inverters.
WARNING
All wiring must be performed by qualied personnel. System safety and ecient operation need to
use appropriate cable for AC input connection. To reduce the risk of injury, please use the proper
recommended cables as below.
Please follow the steps below to implement GRID, LOAD, and GEN port connections:
1. Before making GRID, LOAD, and GEN port connections, make sure to turn o the AC breaker or
disconnector rst.
2. Remove a 10mm sleeve from each wire, unscrew the bolts, insert the cables according to the polarities
indicated on the terminal block and tighten the terminal screws. Ensure the connection is complete.
Model Wire size Cable (mm
2
) Torque value (max)
25/30/40/50KW 4/0 AWG 107 28.2Nm
Backup Load Connection
Grid Connection
Model Wire size Cable (mm
2
) Torque value (max)
25/30/40/50KW 4/0 AWG 107 28.2Nm
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