The Tesla power wall + solar has been great. I got two batteries and as much solar on my house as they could fit. I basically paid $100 down payment and a week later some van showed up literally hoisted a fuckin' jolly roger flag, and I had power the next day. Biggest issue was getting Duke fuckin' energy to accept my energy back into the grid. That said, we've had two major hurricanes since and I've never lost power once in the years I've had it now.