Manual Switch - Inverter to EHU?

[Wissel]

Finally got around to building the new consumer unit. It can change from EHU to inverter power, and has a built in polarity checker/reverser.

Here's the build for anyone interested:

 

[Lenny HB]

I used a 30 amp double pole relay, sockets connected to the inverter in normalmode & when you plug the mains in, sockets connected to consumer unit.