Solar batteries

 

A lot of houses now have solar panels on the roof. I had always assumed that this was for feed in to the National Grid but I heard about solar batteries for the first time last year. Turns out it is basically having something like an electric car battery eg Tesla which is charged from your solar panels so that you can use the electricity generated at other times. This must be because of the advances in battery technology in the car industry. This site outlines some of the parameters. A quoted value of 6kWh would be good because that roughly the amount we are using at the moment. What seems to be lacking is how long it might typically take to recharge, especially at this time of year. Another disadvantage is that it seems most won't supply energy to your house during a power cut.