It would be a complete and utter waste of money which would be a net loss at best over about a 40 year period. It's not hard to calculate the economics of batt

It would be a complete and utter waste of money which would be a net loss at best over about a 40 year period. It's not hard to calculate the economics of batteries for residential solar (I've done it repeatedly), but I can save you some time: it's pointless. Because if it was viable, then it would cheaper and more efficient for utility companies to build their own grid batteries (which they do: but not for long-term energy storage, they use it for grid stability). The price you pay for off-peak power, will always be slightly less the minimum cost of battery ownership. Because if batteries were cheaper to own, then you would get that price via your electricity bill anyway.