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Before connecting the inverter to the grid, ensure the grid voltage and frequency comply with
requirements, for which, refer to "Technical Data". Otherwise, contact the electric power
company for help.
AC Circuit Breaker
An independent circuit breaker or fuse should be installed on the output side of the inverter
to ensure safe disconnection from the grid.
Inverter
Recommended rated voltage
Recommended rated current
SG30CX
400V
63A
SG33CX 63A
SG40CX 80A
SG50CX 100A
SG30CX-NI 63A
SG50CX-NI 100A
AC circuit breakers should be installed on the output side of the inverter and the
grid side to ensure safe disconnection from the grid.
• Determine whether an AC circuit breaker with greater overcurrent capacity is re-
quired based on actual conditions.
• Do not connect any local load between the inverter and the AC circuit breaker.
• Multiple inverters cannot share one AC circuit breaker.
Residual Current Monitoring Device
With an integrated universal current-sensitive residual current monitoring unit included, the
inverter will disconnect immediately from the mains power once a fault current with a value
exceeding the limit is detected.
However if an external residual current device (RCD) (type A is recommended) is mandatory,
the switch must be triggered at the residual current. RCD of other specifications can also be
used according to local standard. The recommended residual current is as follows.
Inverter Recommended residual current
SG30CX 330 mA
SG33CX 330 mA
SG40CX 400 mA
SG50CX 500 mA
SG30CX-NI 330 mA
SG50CX-NI 500 mA
Multiple Inverters in Parallel Connection
If multiple inverters are connected in parallel to the grid, ensure that the total number of par-
allel inverters does not exceed 30.
5 Electrical Connection User Manual
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