Sean Heber on Nostr: I don't recall any rule here about how many, although realistically the power company ...

I don't recall any rule here about how many, although realistically the power company doesn't pay out cash money (at least not for a home install), but they pay out 1:1 credits (here anyway). So installing more than the power you use would just sort of be making free power for the power company because you can't turn those credits into real money - but they apply toward your bill and they bank them so over-generation in summer/sunny days apply to winter/cloudy days.