Definition: Solar battery storage saves surplus daytime solar electricity for evening use instead of exporting it, raising self-consumption from around 35% to 70-85%.

Costs and sizes

A typical 5-10 kWh home battery costs £2,500-£6,000 installed and carries 0% VAT until March 2027. Batteries can also charge cheaply overnight on time-of-use tariffs.

Is it worth it

Best value when your evening usage is high or you’re on a smart tariff. Compare the saving per kWh stored against the battery’s cost per cycle over its ~10-year warranty.

Estimate your numbers: try the free savings calculator or browse all upgrade guides.