Good afternoon gents, just wondering if someone could explain to me the need of a G59 relay when using a back up generator. I kind of understand how a G59 relay works, that it open circuits the switch that operates the generator to prevent it sending electricity out to the grid. Also, it is to prevent mains and generator coming into contact, and if so how isn't this an issue with solar PV, which basically does the same thing. Sorry for all the questions, trying to get my head around it. Thank you