How much does a solar battery cost in the UK in 2026?

A typical home solar battery costs between £2,500 and £10,000 depending on capacity. A 5kWh battery costs around £3,500–£5,000, a 10kWh battery £8,000–£9,500, and a 13kWh+ battery £10,000 or more. Prices include installation and are charged at 0% VAT when fitted with or retrofitted to a solar PV system.

How much is a 5kW solar battery?

A 5kWh battery typically costs £3,500–£5,000 installed. This size suits smaller homes with a 2–3kW solar PV system and can deliver annual savings of around £440.

How much is a 10kW solar battery?

A 10kWh solar battery costs £8,000–£9,500 installed. It pairs well with a 4kW solar system and is a popular choice for 3–4 bedroom UK homes, saving roughly £660 a year.

Does adding a battery qualify for 0% VAT?

Yes. Since 1 February 2024, standalone battery storage and batteries retrofitted to existing solar systems qualify for 0% VAT in the UK until at least 31 March 2027.

Is a solar battery worth it in the UK?

For most homes with solar panels, yes. A battery roughly doubles the share of solar energy you can use yourself — from around 30% to 60–80%. Paired with a time-of-use tariff like Octopus Flux, payback is typically 8–12 years on a battery with a 10–15 year warranty.

Solar Battery Cost UK 2026: Full Price Guide by System Size

Quick Answer

A solar battery in the UK costs £2,500–£10,000 installed in 2026, charged at 0% VAT when fitted with or retrofitted to a solar PV system. A typical 10 kWh battery sized for a 4 kW solar array costs £8,000–£9,500, saves around £660 a year, and pays back in 8–12 years on a 10–15 year warranty.

A solar battery is usually the single most expensive upgrade you can make alongside a solar PV system — and it is also the upgrade that changes the economics most. This guide covers current UK battery prices in 2026 by system size, what drives the cost, what annual savings to expect, and when a battery actually pays back.

Home Battery Price by Solar System Size (UK, 2026)

The right battery size is tied to the size of your solar PV array. A bigger system generates more surplus, so a bigger home battery is needed to store it. Below are typical UK installed prices in 2026 for a lithium battery sized to match each solar system.

Solar system	Recommended battery	Battery cost	Panels + battery total
2 kW	4–5 kWh	£3,500–£5,000	£6,000–£8,500
3 kW	6–7 kWh	£5,000–£8,000	£9,500–£13,500
4 kW	9–10 kWh	£8,000–£9,500	£13,000–£15,500
5 kW	11–12 kWh	£9,000–£10,000	£16,500–£18,500
6 kW	13–14 kWh	£10,000+	£19,500–£20,500

Prices include installation and 0% VAT. They vary with brand, installer, and whether the battery is AC- or DC-coupled to your inverter. Retrofit installs (adding a battery to an existing solar system) tend to sit at the higher end because an additional inverter is usually needed.

What You Get for the Money: Cost Components

Battery unit: £2,500–£10,000 depending on usable capacity and brand
Inverter or hybrid inverter: included in new PV installs; added cost £800–£1,500 on retrofits
Installation labour: £600–£1,000 per day, typically a 1–2 day job
DNO notification (G98/G99): usually included in the installer's price — see our SEG guide for why this matters
Ongoing maintenance: minimal — around £10 per panel if you choose a paid annual clean

Typical Annual Savings

Adding a battery roughly doubles the share of your solar generation you can actually use yourself — from around 30% (solar-only) to 60–80% (solar + battery). In cash terms, that is worth:

Home size	Solar system	Battery savings (year)
1–2 bedrooms	2–3 kW	~£440
2–3 bedrooms	3–4 kW	~£660
4–5 bedrooms	6 kW	~£1,005

Savings scale further when you pair the battery with a time-of-use tariff. See our best Octopus tariffs for solar guide — Intelligent Octopus Flux can pay close to 30p/kWh for battery exports during the 4–7pm peak.

What Drives the Price

Usable capacity (kWh)

The most important variable. UK home batteries typically range from 3kWh to 15kWh of usable capacity. Bigger batteries cost more but capture more surplus generation — and deliver a lower cost per kWh stored.

Battery chemistry (lithium vs lead-acid)

Lithium-ion (specifically LFP — lithium iron phosphate) dominates UK residential storage and is what most people mean when they say "solar battery" or "PV battery". LFP lasts longer, is safer, and is now cheaper than NMC for most home applications. Older lead-acid batteries are rare in new installs.

Brand

Premium brands (Tesla Powerwall, Sigenergy) sit at the top of the price range with longer warranties and more sophisticated software. GivEnergy, FoxESS and Alpha ESS are mid-market with strong UK support networks. See all battery brand reviews or our solar battery storage guide.

AC vs DC coupling

DC-coupled batteries are slightly more efficient and cheaper on new installs because they share the solar inverter. AC-coupled batteries are easier and cheaper to retrofit because they do not interfere with existing equipment.

0% VAT and Available Grants

0% VAT: since 1 February 2024, both standalone batteries and batteries retrofitted to existing solar systems are zero-rated. This runs until at least 31 March 2027.
Smart Export Guarantee (SEG): not a grant, but the income from exporting stored surplus is the main revenue stream — top rates reach 15p+/kWh with time-of-use tariffs.
Home Energy Scotland Loan: up to £6,000 interest-free for batteries in Scotland, covering up to 75% of installation costs.
ECO4 (low-income households): limited availability — solar panels are more commonly included than batteries, but worth checking.

See our full UK solar grants 2026 guide for current eligibility rules.

Is a Home Battery Worth It? (Solar Battery Payback Explained)

For most homes already installing solar, yes — but only just, and only if sized correctly.

The typical payback period for a battery in 2026 is 8–12 years, on a battery warrantied for 10–15 years. That is tighter than panels alone (usually 6–9 years) because:

Batteries only pay back when cycled — a battery that sits at 100% state of charge earns nothing
Summer months drive most of the savings; in December and January the battery rarely fills
Under a flat-rate export tariff, the battery competes with SEG income — you save the import price (~25p) but lose the export income (~12p)

A battery becomes much more attractive in three scenarios:

You have a time-of-use tariff — peak export rates of 25–30p/kWh transform the economics
You have an EV — cheap overnight import charges the battery, which powers the house during peak
You want blackout resilience — some batteries (Tesla Powerwall, Sigenergy) keep your home running during power cuts

Choosing the Right Battery

Size to self-consumption, not generation: for most 4kW systems, 9–10kWh is the sweet spot. Larger often means unused capacity.
Check the warranty carefully: look for 10 years, at least 6,000 cycles, and 70%+ end-of-warranty capacity.
Pick a brand with UK support: GivEnergy, Tesla, Sigenergy, FoxESS all have established UK service networks.
Verify tariff compatibility: Intelligent Octopus Flux only works with specific approved batteries — ask before you sign.
Get MCS-certified installation: required for SEG registration and 0% VAT.

Next Step

The easiest way to benchmark a real quote is to compare two or three local installers. Use our installer comparison tool to get quotes for a solar + battery system sized to your home. All listed installers are MCS-certified.