Are Solar Batteries Worth It in the UK?

Updated June 2026

A home battery can be worth it — but it depends as much on your tariff as your solar.

The two ways a battery saves money

1. Storing your own solar so you use it in the evening instead of importing.
2. Off-peak arbitrage — charging from a cheap night-rate tariff and using that stored energy during expensive peak hours.

In 2026, with wide gaps between off-peak and peak rates, point 2 often does more of the heavy lifting than people expect.

When a battery is worth it

• You’re on (or can switch to) a time-of-use tariff with a cheap off-peak window.
• You have high evening usage you can shift onto stored energy.
• You have solar and currently export a lot at a low rate.

When it’s harder to justify

• Low overall electricity use.
• A single flat-rate tariff with no cheap window.
• A tight budget where extra panels would pay back faster.

What size?

Match usable capacity to your overnight + evening use — for many homes that’s 5–13 kWh. Compare options on our home battery storage page, and check the Smart Export Guarantee so you’re paid fairly for any surplus.