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! 🙂
approaching off the bow 