When I installed solar on my crackerbox in California, I opted for an anemic 800W.
Why?
Because, by law, every watt generated over the total used was a gift to PG&E.
Consider moving to California, you won't have to worry your pretty little head about selling excess power back to the utility company...
Much is still beautiful, but that is outweighed by the cultural collapse, so I have no desire to go back.