I don't have solar, but I want one of these: Elon Musk's Tesla set to unveil home storage battery â€¢ The Register For no other reason than the fact that I have installed a Time-of-Use metre. My off peak is from 10pm to 7am. That is at around 1/5 the rate at which I am charged for on peak times being 2pm to 8pm (The other times are called "shoulder period"). Can't see why the battery can't be charged during off-peak 10pm to 7am and then used during peak 2pm-8pm. I want to order one today.