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5.5
AC Cable Connection
5.5.1 AC Side Requirements
Only with the permission of the local grid department, the inverter can be con-
nected to the grid.
Before connecting the inverter to the grid, ensure the grid voltage and frequency comply with
requirements, for which, refer to
"Technical Date"
. Otherwise, contact the electric power
company for help.
AC Circuit Breaker
An independent three or four-pole circuit breaker must be installed on the output side of the
inverter to ensure safe disconnection from the grid. The recommended specifications are as
follows.
Inverter Model
Recommended Specification
SG3.0RT/SG4.0RT/SG5.0RT/
SG6.0RT
16 A
SG7.0RT/SG8.0RT
20 A
SG10RT
25 A
SG12RT
32 A
SG15RT/SG17RT
40 A
SG20RT
50 A
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 a residual current of 300 mA (recommended). RCD of other
specifications can also be used according to local standard.
User Manual
