Just a thought that popped into my head recently while watching a YouTube video on the Tesla powerwall.
My apartment is heated exclusively by electricity, primarily by storage heaters.
I found myself wondering about the economics of replacing storage heaters with regular electric heaters but powered from a battery which charges on night rate electricity.
Given the lack of controllability of storage heaters, losses during times when I'm not home etc., there would be some advantages to batteries. They can hold their energy better than a hot brick, have electronic timers and thermostats and so on.
As I'm not aware of any such products I guess the economics aren't there but does anyone have an estimate of how close (or far) batteries are from competing with storage heaters?
Also how would the energy density compare? Would a battery with equivalent capacity of a storage heater be the size of my living room?
As you can see I've done none of the math on this!