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.
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