Solar Battery Storage Explained

Why add a battery?

Solar generates most in the middle of the day, while most households use most electricity in the morning and evening. Without storage, a lot of your generation is exported rather than used. A battery closes that gap.

What does it cost?

Battery storage commonly adds £2,000–£5,000 depending on capacity and brand. Bigger is not automatically better — the right size depends on your daily usage pattern.

Batteries and smart tariffs

Some homeowners pair a battery with a time-of-use tariff, charging cheaply overnight and using stored energy during expensive peak periods. This can work even on days when solar generation is low.

Can I add one later?

Usually yes — batteries can often be retrofitted to an existing solar system, though compatibility with your inverter matters. If you think you may add one later, tell your installer at quote stage so they can specify a suitable inverter now.

This article is general information. Costs and savings vary by property, energy use and tariff.