Victron energy MultiPlus-II 48/3000/35-50 120V Manuel page 6

If the local grid code is not supported by the MultiPlus-II an external certified interface device should be used to connect the MultiPlus-II
to the grid.
The MultiPlus-II can also be used as a bidirectional inverter operating parallel to the grid, integrated into a customer designed system
(PLC or other) that takes care of the control-loop and grid measurement,
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