Multi-EVC operation

Multi-EVC operation allows you to connect up to three SMA EV chargers. In multi-EVC operation mode, all charging stations must be connected to the utility grid on a rolling basis.

The Sunny Home Manager provides the charging stations with information on the number of active charging stations every minute.

In multi-EVC operation mode, if multiple charging stations are charging vehicles and there is a two-phase charging vehicle among the vehicles, this vehicle is limited to single-phase charging for symmetry reasons.

If communication between Sunny Home Manager and the charging stations fails, only single-phase or three-phase charging vehicles can be charged. Two-phase charging vehicles are also limited to single-phase charging in this case. You can set fallback values that take effect in the event of a communication breakdown.

2-phase charging electric vehicle at SMA eCharger

In multi-EVC mode, the maximum charging current is limited to ensure overload protection (maximum charging current/number of active charging stations). If, for example, 3 charging stations are connected to a point of interconnection with a nominal current of 35 A, the charging current is limited as follows:

• 1 active charging station: 32 A

• 2 active charging stations: 17.5 A per charging station

• 3 active charging stations: 11.67 A per charging station

Note that loads with high power consumption can cause the charging stations to disconnect from the utility grid to ensure overload protection.

Charge current limitation