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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
SG25CX-P2 300 mA
SG30CX-P2 300 mA
SG33CX-P2 330 mA
SG36CX-P2 360 mA
SG40CX-P2 400 mA
SG50CX-P2 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. A maximum of 13 inverters can be connected in parallel if
the PV module is equipped with optimizers. If SUNGROW Logger1000 is applied, please
note that a maximum of 3500 optimizers can be connected.
5.6.2 Requirements for OT/DT Terminal
OT / DT terminals (not included in the delivery scope) are required for fixing AC cables to
the terminal block. Purchase the OT / DT terminals according to the following requirements.
OT / DT Terminals of Phase Wire
• Specification: M8
figure 5-3 Specifications of the Crimped OT/DT Terminal
OT / DT Terminal of PE Wire
• Specification: M8
5.6.3 Connection Procedure
Step 1 Disconnect the AC-side circuit breaker and prevent it from inadvertent reconnection.
5 Electrical Connection User Manual
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