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Quick answer: A home battery storage system stores electricity so you can use it when you need it rather than when it is generated. Most people pair one with solar panels to store surplus daytime energy and use it in the evening. A typical home battery costs £2,500 to £6,000 installed and can save £300 to £600 a year on top of what solar panels save on their own.
If you have solar panels, or are thinking about getting them, a battery is the natural next step. Without one, any electricity your panels generate that your home is not using at that moment goes straight to the grid. With one, that electricity gets stored and used later. You keep more of what you generate and buy less from the grid. This guide explains how home battery storage works, what it costs, and whether it is worth it for your home. For a broader price breakdown, see our article on solar panels and battery cost.
How does a home battery storage system work?
A home battery storage system sits between your solar panels and your home's electrical supply. Here is what happens step by step.
1. Your solar panels generate electricity during daylight hours.
2. Your home uses what it needs in real time.
3. Any surplus electricity charges the battery instead of going to the grid.
4. In the evening, overnight, or on cloudy days, your home draws from the battery instead of the grid.
5. Once the battery is full or empty, the system switches automatically to grid supply.
You don’t need to manage any of this manually. The battery system handles everythingt automatically.
What is a home battery storage system made up of?
| Component | What it does |
|---|---|
| Battery cells | Store the electricity, typically lithium-ion technology |
| Battery management system | Monitors charge levels, temperature, and safety |
| Inverter or hybrid inverter | Converts electricity between DC (battery) and AC (home supply) |
| Inverter or hybrid inverter | Lets you monitor usage and set charging schedules |
Most modern batteries are wall mounted units roughly the size of a large suitcase. They’re typically installed in a garage, utility room, or on an external wall.
How much does home battery storage cost in the UK?
Home battery storage system costs in the UK typically range from £2,500 to £6,000 installed, depending on capacity and brand. Battery storage has been zero rated for VAT since February 2024, which reduces the upfront cost.
| Battery capacity | Typical installed cost | Best suited to |
|---|---|---|
| 5 to 6 kWh | £2,500 to £3,500 | 1 to 2 person households, lower evening usage |
| 8 to 10 kWh | £3,500 to £5,000 | Average 3 to 4 person households |
| 12 to 15 kWh | £5,000 to £7,000 | Larger homes, EV charging overnight |
Costs correct as of May 2026. Installing a battery at the same time as solar panels is usually more cost effective than retrofitting later. For more detail, see OVO’s guide to solar panel and battery costs. For the official VAT legislation, see The Value Added Tax (Installation of Energy-Saving Materials) Order 2022.
How much can a home battery storage system save?
Savings depend on how much solar electricity you generate, how much you use during the day, and your electricity tariff. A battery makes the most difference for homes with high evening usage.
Without a battery, a typical 4kW solar system self consumes around 30 to 40% of what it generates. The rest goes to the grid. With a battery, self consumption rises to 70 to 80%. That shift from exporting at around 12p per unit to saving at around 24p per unit is where the financial benefit comes from. For more on export payments, read OVO’s guide to the Smart Export Guarantee. You can also check Ofgem’s SEG overview and OVO’s main Smart Export Guarantee tariff page.
| Without battery | With battery | |
|---|---|---|
| Self consumption | 30 to 40% | 70 to 80% |
| Annual SEG export income | £150 to £250 | £50 to £75 |
| Annual bill saving from self consumption | £400 to £600 | £700 to £900 |
| Combined annual benefit | £550 to £850 | £750 to £975 |
Based on a 4kW solar system and OVO's SEG rate of 12p per unit. Electricity at 24.67p per kWh from April 2026.
Can you get a battery without solar panels?
Yes. A standalone battery can be charged from the grid, which makes sense if you’re on a time of use tariff with cheaper overnight electricity rates. You charge the battery overnight at the lower rate and use that electricity during the day when the rate is higher.
This works best on tariffs with a significant difference between peak and off peak rates. OVO can advise on whether a standalone battery makes financial sense for your situation. For more on whether this setup stacks up, see our article on solar storage batteries.
What is the difference between a hybrid inverter and a standard inverter?
If you’re installing solar panels and a battery at the same time, a hybrid inverter manages both in one unit. It’s more efficient than having a separate solar inverter and a separate battery inverter, and it simplifies the installation. If you’re adding a battery to an existing solar system that already has a standard inverter, a separate battery inverter is typically used instead.
How long does a home battery last?
Most home batteries come with a 10 year guarantee and will typically last 15 years or more. Battery capacity degrades slightly over time, similar to a phone battery. Most manufacturers guarantee at least 70% of original capacity after 10 years. For a broader view of long-term value and payback, see is it worth getting a solar storage battery with my solar panels?
Frequently asked questions
What is home battery storage cost?
A home battery storage system in the UK typically costs £2,500 to £6,000 installed depending on capacity. Battery storage is zero rated for VAT. Installing a battery at the same time as solar panels is usually cheaper than retrofitting one to an existing system.
What is a home battery storage system?
A home battery storage system stores electricity generated by solar panels, or charged from the grid, for use when your panels aren’t generating. It lets you use more of the electricity you generate yourself, reducing how much you buy from the grid and lowering your energy bills.
What is home energy storage?
Home energy storage is another term for a home battery storage system. It refers to any technology that stores electrical energy at home for later use, most commonly a lithium-ion wall mounted battery unit paired with solar panels.
Do I need solar panels to get a home battery?
No. You can install a battery without solar panels and charge it from the grid on a cheap overnight tariff. However the financial case is much stronger when paired with solar panels, as you’re storing free solar electricity rather than cheap grid electricity.
How long does it take to charge a home battery from solar panels?
On a sunny summer day a 4kW solar system can fully charge a 10kWh battery in around two to three hours with surplus generation. In winter, or on overcast days, charging is slower and the battery may only partially charge. Your system will automatically draw from the grid to supplement the battery if needed.
Is battery storage worth it in the UK?
For most homes with solar panels, yes. The reduction in grid imports typically outweighs the drop in SEG export income, and the combined annual benefit is higher with a battery than without one. Payback periods are typically 7 to 12 years. Without solar panels, the case is narrower and depends on your tariff and usage pattern.
Get a free solar and battery quote from OVO
OVO installs solar panels and battery storage together or separately. A combined installation is usually more cost effective than doing them at different times. Get your free OVO survey and quote to find out what a battery system would save for your home.