Costs

How Much Do Solar Battery Storage Installers Cost?

Adding storage lets you use more of your own solar and buy cheap off-peak power. In 2026, solar battery storage installers in the UK charge £2,500-£8,000 fitted. A 5kWh battery is around £2,500-£4,000 installed, 10kWh is £5,000-£8,000, with £500-£1,200 of that being installation labour. Retrofitting to an existing solar system usually costs a little more than adding a battery during a new install. Here is the full 2026 ladder.

£2.5k-£8k fitted Labour £500-£1,200 Ladder by kWh

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Costs Guide

Solar Battery Cost by Capacity & Install Type

Total price is mostly the battery itself, then installation labour, a hybrid or AC-coupled inverter if needed, and any consumer-unit or wiring work. Bigger batteries cost more but usually less per kWh. Prices below include supply and fitting by an MCS-registered installer.

System	Installed cost 2026	Suits
Smaller battery	£2,500–£4,000	A 1–2 bedroom property or a modest array — evening use and off-peak charging
Mid-size battery	£5,000–£8,000	The sweet spot for a typical 3–4 bed home with a 4kWp+ array
Large battery	£7,000–£11,000+	High users and off-peak arbitrage — usually the lowest cost per kWh
of which installation	£500–£1,200	Mounting, wiring, commissioning and MCS paperwork
Retrofit inverter change	£800–£2,000	Where existing panels need an AC-coupled or hybrid inverter

Small battery (about 5kWh)

£2,500-£4,000 installed. Suits a smaller home or modest solar array. Covers evening use and off-peak charging for a 1-2 bedroom property.

Mid battery (about 10kWh)

£5,000-£8,000 installed. The popular sweet spot for a typical 3-4 bed home with a 4kWp+ solar array. Best balance of cost and daily coverage.

Large battery (13kWh+)

£7,000-£11,000+ installed. For high users, larger arrays or those maximising off-peak tariff arbitrage. Cost per kWh is usually the lowest here.

Installation labour

£500-£1,200 of the total. Covers mounting, wiring, commissioning and MCS paperwork. Awkward routing or a consumer-unit upgrade adds to this.

Retrofit vs new install

Adding a battery to existing panels is straightforward but may need an AC-coupled or hybrid inverter change (£800-£2,000). Fitting alongside a new solar system shares scaffolding and labour.

VAT and what is included

Domestic battery storage qualifies for 0% VAT in 2026. Quotes should include battery, inverter/coupling, wiring, commissioning, warranty and MCS certification.

Frequently Asked

Common Questions

How much does a solar battery cost to install in 2026?+

£2,500-£8,000 fitted for most homes: around £2,500-£4,000 for 5kWh and £5,000-£8,000 for 10kWh, including installation by an MCS-registered installer.

How much of the price is installation labour?+

Roughly £500-£1,200. The rest is the battery, any inverter or AC-coupling hardware, wiring and commissioning. A consumer-unit upgrade adds more.

Do I pay VAT on a home battery?+

No - domestic battery storage qualifies for 0% VAT in the UK in 2026, whether fitted with solar or on its own.

Can I add a battery to my existing solar panels?+

Yes. Retrofit is common, though it may need an AC-coupled or hybrid inverter, which adds £800-£2,000. An MCS installer will confirm what your system needs.

What size solar battery do I need?+

Most 3-4 bed homes with a 4kWp+ array suit a 10kWh battery. Smaller homes or arrays often do well with 5kWh. Size it to your evening use and any off-peak tariff plans, not just the panels.

Is a solar battery worth it?+

It improves self-consumption and lets you charge off-peak, but payback depends on your usage, tariff and battery price. Get quotes and compare the numbers for your home before committing.

Keep Reading

Related Guides

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Reviewed by the BestBuilders editorial team · Last updated: 25 July 2026 · See our editorial standards.