How much does a solar battery cost in the UK?

According to industry data, solar battery storage systems typically cost between GBP2,500 and GBP6,000 depending on capacity. Smaller 3-5kWh batteries sit at the lower end, while larger 10-13.5kWh systems cost more. Installation is usually included in the quoted price.

How long do solar batteries last?

According to manufacturers, most lithium-ion solar batteries carry warranties of 10-15 years or a guaranteed number of charge cycles. Real-world lifespan may exceed the warranty period, though capacity gradually reduces over time.

Can I add a battery to existing solar panels?

Yes. According to installers, batteries can be retrofitted to existing solar panel systems. Some batteries are AC-coupled, meaning they work with any existing inverter setup. However, installing a battery at the same time as solar panels is usually more cost-effective.

Is solar battery storage worth it in the UK?

According to industry analysis, battery storage makes the strongest financial case when you use most electricity in the evening, have time-of-use tariffs with significant peak and off-peak price differences, or want backup power during outages. The financial case improves as electricity prices rise.

Solar Battery Storage UK 2026

Information notice

This guide compiles information from manufacturer specifications, industry publications, and installer data. We are an independent information service, not battery installers. Always consult MCS-certified installers for advice specific to your property and existing solar system.

How Solar Batteries Work

A solar battery stores surplus electricity generated by your solar panels during the day, so you can use it in the evening and at night when the panels are no longer generating. Without a battery, any electricity you do not use immediately is exported to the grid.

According to the Energy Saving Trust, a typical household without a battery might use only 50-60% of the solar electricity generated. Adding a battery can increase self-consumption to 80% or more, significantly reducing the amount of electricity you need to purchase from the grid.

Most home batteries use lithium-ion technology, the same chemistry found in electric vehicles. They are compact, wall-mounted units typically installed in a garage, utility room, or on an exterior wall.

Store and use

Solar energy on your schedule

Solar Battery Costs

Capacity	Typical cost	Suited to	Evening coverage
3–5kWh	£2,500–£3,500	Small households, low evening usage	A few hours of typical use
5–8kWh	£3,500–£5,000	Average households, moderate evening usage	Most of an evening for typical homes
10–13.5kWh	£4,500–£6,000	Larger households, high evening usage, EV owners	Full evening and overnight for many homes

Source: compiled from installer pricing data and manufacturer RRPs, 2026. Costs include installation. Batteries for residential use attract 0% VAT when installed with solar panels (HMRC).

Benefits of Solar Battery Storage

Benefit

Increased self-consumption

According to the Energy Saving Trust, adding a battery can increase the proportion of solar electricity you use directly from around 50-60% to 80% or more, reducing grid purchases.

Benefit

Time-of-use tariff savings

Some energy tariffs charge different rates at different times of day. A battery lets you charge from the grid at cheap overnight rates and use stored energy during expensive peak hours.

Benefit

Backup power

Some battery systems offer backup power during grid outages. According to manufacturers, not all batteries include this feature, so check specifications if this is important to you.

When Does a Battery Make Financial Sense?

Strong case

When a battery earns its keep

You use most electricity in the evening and at night
You have access to a time-of-use tariff with large peak/off-peak differences
You are installing solar panels anyway (adding a battery at the same time is cheaper)
Backup power during outages is important to you

Weaker case

When a battery is harder to justify

You work from home and already use most solar electricity during the day
Your electricity usage is very low overall
You are on a flat-rate tariff with no peak/off-peak difference
Budget is tight and solar panels alone would give better return on investment

Grant scheme overview

Check your battery storage eligibility

Some households may qualify for subsidised energy storage installation through government schemes. Check your eligibility.

historical — replaced by GBIS & BUS

Grant available

Key eligibility factors:

ECO4 closed March 2026
Insulation routes now via GBIS
Heat pump routes now via BUS

Check your property against the live MHCLG EPC register to see your current band and every grant you qualify for — free, in under a minute.

Check your property

Get solar battery quotes

Connect with MCS-certified installers who can advise on the right battery size for your home and solar system.

Up to 3 MCS-certified installers. No obligation quotes.

Battery installation process

Assessment

An installer reviews your solar system, electricity usage patterns, and available space for the battery unit.

Sizing

The installer recommends a battery capacity based on your solar generation, usage patterns, and budget.

Installation

Battery installation typically takes half a day to a full day, depending on the system and whether it is retrofitted or installed alongside new panels.