What a home battery actually costs, before anyone calls you.
Modelled prices, the grants that apply where you live, and a free quote when you want one.
Three quotes for the same battery can differ by thousands. Here is the honest spread.
Smallest batteries
£3,380
A small battery added to an existing solar array.
Median town price
£5,200
A mid-size battery sized for a three bedroom house with solar. Most quotes land here.
Largest batteries
£8,060
Larger capacity, standalone installs without solar, or backup power.
up to £192
A year off a typical home's bills
27 yrs
Payback before grants
Source: Home Energy Quotes Cost Index. Prices are estimates and include installation and VAT. Actual costs may vary.
Quick answer: a home battery costs roughly £3,400–£8,100 installed in 2026, with a typical 10kWh system around £5,200 — about £400–£700 per usable kWh. Batteries carry 0% VAT until 31 March 2027. Savings depend heavily on your tariff. On the flat-rate price cap, our modelled estimate for a 10kWh battery added to solar panels is up to £192 a year, a payback of around 27 years. A cheap overnight rate is what shortens that.
What a battery actually does for your bills
A home battery does not generate electricity — it shifts it. That matters, because it means the saving comes from the price difference between when you store power and when you use it. Two things create that gap: storing your own solar generation instead of exporting it cheaply, and charging from the grid on a low overnight rate to use during expensive peak hours. At the October–December 2026 price cap of 26.32p/kWh, and with overnight rates on some time-of-use tariffs well below that, the arbitrage is real but modest per cycle. On a flat-rate tariff, with only solar to store, payback runs to decades.
Our figures are modelled estimates, not quotes. See how we calculate costs and the UK Home Energy Cost Index.
Sizing: how many kWh do you need?
| Household | Typical annual use | Battery size | Indicative installed cost |
|---|---|---|---|
| 1–2 bed flat / small home | ~1,800 kWh | 3–5 kWh | £2,500–£4,000 |
| 3-bed semi | ~2,500 kWh | 5–10 kWh | £4,000–£6,000 |
| 4-bed detached | ~4,100 kWh | 10–13.5 kWh | £5,500–£8,000 |
| Home with EV + heat pump | 5,000 kWh+ | 13.5 kWh+ | £7,000–£12,000 |
Work out your own numbers with our battery sizing guide, or estimate costs for your region with the free savings calculator.
With solar, or without?
You do not need solar panels to benefit from a battery — a grid-charged battery on a time-of-use tariff saves money on its own, though the economics are tighter. If you already have panels, adding storage is usually cheaper than a standalone install because the inverter work may already be done. See battery storage without solar and retrofitting to an existing system, plus the AC vs DC coupling decision and hybrid inverters explained.
Choosing a battery
Compare on usable (not nominal) capacity, warranty length and throughput guarantee, round-trip efficiency, and whether the manufacturer is likely to still exist in ten years. We have not bench-tested these units — our reviews analyse published specifications and warranty terms. Start with the best home battery systems compared, then the individual reviews: Tesla Powerwall 3, GivEnergy (its maker entered administration on 9 April 2026, so read that review as a guide for existing owners), and the SolaX, FoxESS and Sunsynk budget brands. Warranty risk is worth understanding too — see what happens if the manufacturer goes bust.
Getting more from a battery
The tariff matters more than the hardware. A battery on a flat-rate tariff earns a fraction of what the same battery earns on a well-matched time-of-use rate — see the best smart tariffs for solar and battery. Beyond that, home energy management systems automate charge scheduling, and virtual power plants pay you to share stored capacity with the grid. If you have a heat pump, read whether a battery is worth it alongside one.
Is it worth it?
Honestly: it depends on your tariff and how much of the stored energy you actually cycle. A battery bought purely on payback maths is a marginal purchase at current prices. On the flat-rate cap our model puts payback at around 27 years with solar, well past a 10–15 year warranty. The Energy Saving Trust’s 2026 research found that adding a battery to solar panels may not save enough to justify the cost on its own, and that batteries do better paired with a heat pump on a time-of-use tariff (Energy Saving Trust, checked September 2026). Buyers who are happiest with theirs tend to value the resilience and the self-consumption of their own solar as much as the pure return. Read the full argument in is solar battery storage worth it in 2026 and costs and benefits.
One timing note: the 0% VAT relief on batteries ends 31 March 2027. After that it goes to the reduced rate of 5%, roughly £250 on a £5,000 system (HMRC VAT Notice 708/6).
Questions people ask about battery storage
How much does battery storage cost in the UK?
Is there a grant for battery storage in the UK?
How long is the payback period in the UK?
Do I need planning permission for battery storage?
How do I find a good installer in the UK?
Get prices for your own home
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Last reviewed: . Costs are modelled estimates from the Home Energy Quotes Cost Index — see how we calculate them. Grant rates are checked against GOV.UK.