Multi-EVC operation

Multi-EVC operation is supported from firmware version 1.02.##.R and allows the connection of a maximum of 3 SMA EV Chargers. Mixed systems with single-phase charging stations (EVC7.4-1AC-10) and three-phase charging stations (EVC22-3AC-10) are possible.

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 a vehicle 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.

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Limiting a two-phase charging vehicle to single-phase charging

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.

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Charge current limitation

    Communication Overview
    Mounting