User Manual
6 Electrical Connection
29
It is not allowed for several inverters to use one circuit breaker.
It is not allowed to connect loads between inverter and circuit breaker.
Residual Current Device
With an integrated comprehensive residual current monitoring unit inside, the
inverter is able to distinguish the fault current from normal capacitive leakage
current. Inverter will disconnect from the grid as soon as a fault current of more than
limit value is detected.
If an external RCD or residual current breaker is installed, the switch should be
triggered when the fault current is 600mA or higher.
Multiple Inverters in parallel Connection
The following different requirements must be respected if several inverters are in
parallel connection to the grid.
Scenario 1:
Several inverters are in
parallel connection to
the 3-phase low voltage
grid
Requirements:
If the number of the
grid-connected
inverters exceed 40,
please contact
Sungrow.
Scenario 2:
Several inverters are in parallel connection to the low voltage side of the MV
transformer. The high voltage side is connected to the middle voltage grid.
Requirements:
If the number of the grid-connected inverters exceed 40, please contact Sungrow.
Nominal power of the transformer low voltage side matches the inverter output power.
