Ongrid/Offgrid: Electrical diagram for connecting the backup line of a hybrid inverter with batteries to the main line

The idea here is to connect the backup line of the inverter to the house main line with a contactor in order to manage two situations: a) automatic backup when the grid goes down b) isolate from the grid when you wanna

This can be done easily with the use of a 2NC/2 NO contactor, following a diagram and the sequence of different situations that can happen:

Diagrams in pdf here for your convenience download:

That’s all, hope it helps! 🙂

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