I've got 5.5kW of solar, generates 5MWh per year fairly reliably.   To make better use of that energy we had a quote for a 9.5kWh battery for £7k.    I know I don't have enough information to know exactly how much I could save, since I don't know what utilisation I make of solar. I also don't currently have a smart meter or time of use tariff, which limits the battery payback for now.    However, with prices heading towards 50p/kWh even pessimistic estimates meant t