I've used battery / inverter power in telephone company central-office buildings. Anyone who thinks that kind of thing can power the most populous state every night is nuttier than a squirrel turd. The facts speak for themselves: for $100,000,000,000, California got nowhere near the storage capacity equivalent to the power plants they've already decommissioned. And not even their most fanciful projects, which they can't afford to build OR maintain, will come close.