Worked example
A home that already has solar panels
MCS example: 4,059 kWh of solar a year, 7.5 kWh usable battery
Best next step
Switch export tariff first.
A battery is unlikely to recover its cost under these assumptions.
Is solar, or a battery, worth it for your home?
We do the maths. You make the call. What solar panels or a battery would cost, what they could save, and whether buying makes sense for a home like yours: official figures, with the working shown.
Modelled
Is a battery worth it for your home?
A few quick questions, then an honest verdict compared with switching tariff first. Nobody asks for your details.
Read before you buy
All guidesSolar costs · Checked 12 Oct 2026
How much do solar panels cost in the UK?
Installed price per kW by system size, from the government's figures.
Median installed cost per kW, all MCS installations (homes and other buildings), Great Britain, 2025-26. DESNZ, published 28 May 2026.
Battery costs · Checked 13 Oct 2026How much does a solar battery cost?
Installed cost per kWh by battery size, from the government's figures.
Got a quote · Checked 13 Oct 2026How to check a solar panel quote before you sign
The price, the savings it promises and the paperwork to check before you sign.
- VAT on solar panels in the UK: the rules and the 2027 changeThinking about solarChecked 14 Oct 2026
- Feed-in Tariff: payments, rates and changes to your solarI have solarChecked 14 Oct 2026
- Solar inverter replacement: what to do when yours failsI have solarChecked 14 Oct 2026
- Should you get solar panels with a battery?Thinking about solarChecked 13 Oct 2026
Latest figures
Last checked 14 Oct 2026. Every number on Worthwatt links to its source.
Battery cost, 11 to 30 kWh
£630
Per kWh of nominal capacity installed, median, 11 to 30 kWh.
Ready for an installer to quote for your home?
- Tell us what you need. It takes about a minute.
- We look for one MCS-certified installer who covers your area.
- You decide whether to hear from them. Quotes are free, with no obligation and no call storm.