Battery storage costs £2,500–£6,000 installed. The Warm Homes: Local Grant funded batteries in 17% of all installs to end-July 2026. 0% VAT applies. Here’s everything UK homeowners need to know.
A home battery storage system stores electricity — either generated by your solar panels or imported from the grid during cheap-rate periods — and releases it when your panels aren’t generating or when electricity prices are high. It’s the single most effective way to maximise the value of solar panels.
| Battery capacity | Typical cost installed | Homes suited to | Daily cycles |
|---|---|---|---|
| 5 kWh | £2,500–£3,500 | 1–2 person households, small solar | 1 |
| 10 kWh | £3,800–£5,500 | 3–4 person households, most common | 1–2 |
| 15 kWh | £5,000–£7,500 | Larger homes, EV charging | 1–2 |
| Multiple units stacked | £8,000+ | High consumption, off-grid aspirations | Multiple |
Costs for August 2026 based on UK installer data. Prices have fallen significantly in recent years and continue to decrease. 0% VAT applies to 31 March 2027ly.
Warm Homes: Local Grant — yes: Battery storage accounted for 17% of all WH:LG measure installations to end-July 2026. It is typically funded alongside solar panels rather than as a standalone measure for eligible households.
Warm Homes Loan Scheme — expected Sept 2026: Battery storage is expected to be fundable through the upcoming Warm Homes Loan Scheme for homeowners who don’t qualify for a grant.
ECO4 — no: Battery storage is not covered by ECO4.
You don’t strictly need solar panels, but battery storage is most cost-effective when paired with solar. A standalone battery can be charged on cheap-rate overnight electricity (if you have a time-of-use tariff), but the payback period is longer without solar generation.
Most lithium iron phosphate (LFP) batteries carry a 10-year warranty and are expected to last 10–15 years. Lithium nickel manganese cobalt (NMC) batteries are similar. Warranty degradation guarantees typically specify that the battery will retain at least 70–80% of its original capacity after the warranty period.
Home battery storage systems installed in conjunction with solar panels benefit from 0% VAT. Standalone battery storage (without solar) is subject to 20% VAT unless installed as part of an exempt supply. This is an important cost consideration.