The short answer
A home solar battery in the UK typically costs between £2,000 and £6,000 installed, depending mainly on its usable capacity. A smaller battery of around 5kWh often sits near £2,500–£4,000, while a larger 10kWh unit commonly runs £4,000–£6,000 or more. Cost is driven by capacity, the battery chemistry and brand, and whether it is fitted alongside a new solar system or retrofitted later. Most modern lithium home batteries are warrantied for around 10 years and rated for several thousand charge cycles. Storage lets you use more of your own solar power in the evening instead of importing from the grid, but whether it pays back depends on your usage pattern and your import and export tariffs.
Battery prices scale with usable capacity. The harder question is not the price tag but whether storage earns its keep for your particular household.
Typical UK battery cost
- ~5kWh battery~£2,500–£4,000
- ~10kWh battery~£4,000–£6,000+
- Typical warranty~10 years
- Typical cycle ratingSeveral thousand cycles
- Best fitted withA new solar install (cheaper than retrofit)
Typical cost by capacity
Battery price is driven mostly by usable capacity, measured in kilowatt-hours (kWh) — the amount of stored energy you can draw on. Bigger batteries store more evening and overnight power but cost more and only help if you have the solar generation and usage to fill and empty them. The table shows indicative installed ranges for popular home sizes.
| Usable capacity | Typical installed cost | Roughly covers | Suited to |
|---|---|---|---|
| ~5kWh | ~£2,500–£4,000 | An evening of typical use | Smaller homes / modest usage |
| ~8kWh | ~£3,500–£5,000 | Most of an evening + overnight | Average family home |
| ~10kWh | ~£4,000–£6,000 | Evening + overnight base load | Higher usage / EV charging |
| 13kWh+ | ~£6,000+ | A full day's base load | Large home, off-peak arbitrage |
Indicative installed costs for guidance. Sources: Energy Saving Trust; MCS. Prices vary with brand, chemistry and whether fitted with new solar or retrofitted.
What drives the price
Two batteries of the same capacity can be priced differently. The main factors are:
- Usable capacity: the headline driver. Note the difference between total and usable capacity — manufacturers reserve some capacity to protect battery health.
- Chemistry and brand: most home batteries use lithium-ion, often lithium iron phosphate (LFP), which is valued for safety and long cycle life. Premium brands command higher prices.
- New install vs retrofit: adding a battery during a new solar installation is usually cheaper than retrofitting later, because the survey, scaffolding and some electrical work are already being done.
- Hybrid vs AC-coupled: a hybrid inverter that handles panels and battery together can be efficient for new installs; retrofits often add an AC-coupled battery with its own inverter, which affects cost.
Lifespan, warranty and whether it pays back
A battery is a long-term asset, so warranty and lifespan matter as much as the upfront price:
- Warranty: most home batteries carry a warranty of around 10 years, often guaranteeing the battery will retain a stated percentage of its capacity (commonly around 70–80%) at the end of that period.
- Cycle life: lithium home batteries are typically rated for several thousand full charge-discharge cycles, which for daily solar use generally aligns with the warranty period.
- Does it pay back? A battery saves money by storing daytime solar for use in the evening, cutting grid imports, and by letting some tariffs charge cheaply off-peak. Whether the saving outweighs the cost depends on how much surplus solar you generate, your evening usage, and your import and export rates. For some households storage pays back within its warranty; for others the payback is longer than the battery's expected life, so it is worth checking the numbers for your usage before adding one.
Storage also adds resilience and lets you self-consume more of your generation — value that is partly financial and partly about using your own clean power rather than exporting it cheaply.
Frequently asked questions
Is a solar battery worth it in the UK?
It depends on your usage. A battery pays back by storing daytime solar for evening use and reducing grid imports, and some tariffs let you charge cheaply off-peak. If you generate plenty of surplus and use a lot of electricity in the evening, the savings can justify the cost within the warranty. For lower-usage homes the payback can be longer than the battery's life, so it is worth checking the numbers.
How long does a solar battery last?
Most home lithium batteries are warrantied for around 10 years and rated for several thousand charge cycles. In daily solar use that warranty period and cycle rating usually align. Capacity gradually fades over time, which is why warranties typically guarantee a minimum retained capacity at the end of the term rather than 100%.
Is it cheaper to add a battery later or with the panels?
Adding a battery at the same time as a new solar installation is usually cheaper than retrofitting it later, because the survey, scaffolding and much of the electrical work are already being carried out. A retrofit can still make sense, but it often involves a separate visit and an AC-coupled battery with its own inverter.
Sources & further reading
Figures on this page are typical UK ranges drawn from published sources and depend on your specific home. They are guidance, not a quotation or guaranteed saving.