How Much Does a Home Solar Battery Cost in London? (2025 Guide)

Written By Matthew Costantino

If you’re considering adding battery storage to your home, one of the first questions you’ll naturally ask is:

How much does a home solar battery cost in London?

For most London homeowners, a realistic installed price range is:

  • Around £3,500–£4,000 inc. VAT for a ~5kWh battery

  • Around £4,800–£6,000 inc. VAT for a ~10kWh battery

  • Around £7,500–£10,000+ inc. VAT for larger or premium 13.5kWh+ systems

These figures include the battery itself, installation, and commissioning. The final cost depends on battery size, brand, your existing electrical setup, and whether the battery is installed alongside solar panels or added later as a retrofit.

This guide explains typical battery costs in London, what affects pricing, and how to compare quotes properly.

Typical home solar battery costs in London

Most residential battery installations fall into one of the following categories.

Smaller batteries (around 5kWh)

Typical installed cost: £3,500–£4,000 inc. VAT

Best suited for:

  • Homes with lower evening electricity use

  • Shifting some daytime solar into the evening

  • Charging overnight on off-peak tariffs

  • Properties with limited installation space

Medium batteries (around 10kWh)

Typical installed cost: £4,800–£6,000 inc. VAT

This is the most common option for London homes and works well for:

  • Typical family households

  • Maximising the use of solar generation

  • Reducing reliance on peak-rate electricity

  • Homes planning future EV charging

Larger or premium systems (13.5kWh+)

Typical installed cost: £7,500–£10,000+ inc. VAT

Usually recommended where:

  • Electricity usage is higher

  • EV charging is done regularly at home

  • Greater energy independence is a priority

  • A premium, all-in-one system is preferred

Retrofit vs installing a battery with solar

Battery pricing is often lower when installed at the same time as solar panels, as some labour and components overlap.

A retrofit battery installation (adding a battery to an existing solar system) can cost more if:

  • The existing inverter is not compatible

  • Additional cabling is required

  • Extra protection or consumer unit upgrades are needed

This is why a site survey is important before giving a fixed price.

What’s included in a solar battery installation?

Not all battery quotes include the same scope of work. A professional installation should typically include:

  • Supply and installation of the battery system

  • Inverter configuration or hybrid inverter setup

  • All required cabling, isolators, and protection devices

  • Integration with existing solar panels (if applicable)

  • Full testing, commissioning, and certification

  • App setup and a user walkthrough

This ensures the system is safe, compliant, and ready for long-term use.

What affects the cost of a solar battery in London?

Property type and layout

London homes often involve:

  • Longer cable runs in terraced properties

  • Limited internal space

  • Access and working restrictions

These factors can affect labour time and overall cost.

Battery size and specification

Larger batteries store more energy but cost more upfront. Different manufacturers also offer different warranties, usable capacity, and performance characteristics.

Electrical upgrades

Some homes require additional work to meet current regulations, such as:

  • Consumer unit upgrades

  • Additional protection devices

  • Load management adjustments

Is a home solar battery worth it in London?

For many households, yes — particularly when combined with solar panels or time-of-use electricity tariffs.

Key benefits include:

  • Using more of your own generated electricity

  • Reducing reliance on peak-rate grid power

  • Lower overall electricity bills

  • Improved energy resilience

  • Future-proofing against rising energy prices

A battery is most effective when sized correctly for your usage.

Can you add a battery later?

Yes. Many homeowners install solar panels first and add battery storage later once they understand their energy usage better.

During a survey, installers will assess:

  • Existing inverter compatibility

  • Available installation space

  • Cable routes and protection requirements

  • Options for future expansion

How long does solar battery installation take?

  • Many battery installations take around half a day

  • More complex or retrofit installations can take a full day

  • Flats or difficult access may extend installation time

Timescales are confirmed during the survey stage.

Get an accurate solar battery quote in London

Every home and energy profile is different. The best way to determine the right battery size and cost is through a professional site survey.

We install solar battery systems across London and surrounding areas, providing clear advice, qualified electricians, and fully compliant installations.

Contact us for a free solar battery quote
Or book a no-obligation site survey

Matthew Costantino
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