Complicated but certainly a profitable set up.
Using the sun to mine Bitcoin is quite a great idea. It should work in the long run as the electricity is FREE. It takes a lot of skills to do that. I wonder how much you'd spend for such set up.
electricity is free but there are still cost to maintain panel batter and everything else, what if you're pannel get screwed by a storm or bad weather, you need to reinvest again, not convenient at all
the same for the battery which is not cheap, nothing is free in this world unless you find money on the street...