Might read Karl Deninger at Market Ticker for an alternate take on Musk and his supposed intelligence. Follow the money, as has been said. There is a recent thread at
www.airforums.com in re the pwall for RVs. Wouldn't occur to me to want a lithium batt or a propane water heater under my bed, but . . . . AM Solar already has what I might want for our limited space in a lightweight aerodynamic house.
Kris De Decker at Low Tech also has a good recent article on electrical storage.