Battery Storage for Home: A UK Guide

Battery storage for your home lets you buy electricity when it’s cheapest, store it, and use it when prices are high. In a larger home, that stored energy can run your heating and cooling, heat your pool and charge your car, and keep the essentials running in a power cut.

Under Ofgem’s price cap for October to December 2026, the average electricity unit rate is about 26p per kWh (Ofgem). Smart off-peak rates cost a fraction of that. A home battery lets you live on the cheaper rate, even in the evening.

How home battery storage works

A home battery is a rechargeable lithium battery connected to your electrics through an inverter. Paired with a smart time-of-use tariff, it runs a simple daily cycle:

1. Overnight: the battery charges from the grid in the cheap off-peak window.

2. Through the day: your home runs on stored energy instead of peak-rate electricity.

3. When it runs low: the home switches back to the grid automatically.

4. In a power cut: a system with backup keeps your chosen circuits powered.

Systems such as the SigenStor read your tariff, learn how you use energy and decide when to charge and discharge. Once installed, there’s nothing for you to do.

Do you need solar panels?

No. Home battery storage in the UK works without solar: it charges from the grid on an off-peak tariff. Read our guide to home battery storage without solar to see whether it’s worth it for your home.

What a battery can power in a larger home

• Heating and cooling: keep rooms comfortable on stored off-peak energy. See heating and cooling.

• Pool heating: keep the water warm for longer for less. See pool heating.

• EV charging: charge overnight on the cheap rate, and top up in the day without paying peak prices.

• Backup power: keep the fridge, Wi-Fi, lighting and security running in a power cut.

What size battery do you need?

It depends on how much electricity you use and when. Homes with an EV, pool or electric heating usually need more storage. Our guide to choosing the right battery explains sizing in detail.

How much does home battery storage cost in the UK?

Cost depends on capacity, installation and whether solar is included. Batteries fitted alongside solar are zero-rated for VAT until 31 March 2027; standalone batteries pay the standard rate. See our guide to battery costs.

What to look for in an installer

• An MCS-certified installer

• Backup capability, if power cuts are a concern

• Smart tariff integration that charges at the cheapest times automatically

• A clear warranty on capacity and years

• One team for design, installation and aftercare

See what you could save

Every home is different, so any saving is an estimate. Try our savings calculator for your estimated annual saving in under two minutes, or call us on 01844 279274.