Single MultiPlus-II ESS in a 3-phase house with manual V2L backup

DIY
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1

I am planning a Dutch 3×25 A installation with:

  • one MultiPlus-II 48/4500 on L1
  • Cerbo GX
  • EM540 energy meter
  • battery
  • ESS
  • critical loads on AC-out-1

During a grid outage I’d like to manually switch the AC input of the MultiPlus from Grid L1 to an external 230 V source (Hyundai Kona V2L or a generator).

My questions are:

  1. Is this a supported ESS topology?
  2. Can the AC input simply be selected with a manual transfer switch between Grid L1 and the external source?
  3. Is there an official Victron wiring diagram for a single MultiPlus-II in a three-phase installation?

The goal is to recharge the battery and power the backed-up loads from the external AC source during a prolonged grid outage.

First picture is how I think a wiring ‘diagram’ would be, But I Don;t know if it is correct.
Second picture is the situation in a power-outage. My car (or a generator) will fill the battery.

20260720_1-3
20260720_1-32677×1521 272 KB

20260720_V2L
20260720_V2L2659×1558 290 KB

2

Is not possible without changing gridcode, you could however connect your V2L to a separate mp2 or battery charger (skylla for example)