I bought a SonOff pow R2 to work with my 220V A/C Unit . My electrician says it cant work because our 220 V system uses 2 input wires but the sonoff only uses 1. he said something about it being a europpean system being different. What can he do to work around it?
The electrician, if he is worth his salt, can size and recommend a contactor/enclosure. I have bought them on Amazon in the $10 to $30 range and mounted them in metal boxes in the same neighborhood of price. You are probably looking at $20 to $50 for the parts.
By the way, if you intend to monitor the power consumption with the POW then the contactor method will not work. The AC load current will be passing through the contactor. The POW will only see the tiny amount of power needed to energize the coil. You may as well just use a Basic.
If it is electronic the Sonoff isn't going to turn it on. When power is applied the initial state is off and requires a button push.
If it were me I would look at some of the wi-fi enabled AC remotes like the Switchbot.