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How Much Do Solar Batteries Cost?

A solar battery costs £4,500, on average

You should expect to pay £1,100 per kWp of your solar panel system

The typical home will make £3,590 in profit from a solar-plus-storage system


A solar battery is an excellent way for you to cut your energy bills while helping to save the planet.

You typically only use half of the electricity your solar panels generate – but with a solar battery, you could use practically all of that free, clean energy.

In this guide, you’ll find out how much you’d pay for a solar battery, how it would impact your solar panel costs, and what else to consider before making your decision.

To find out how much a new solar-plus-storage system will cost you, just fill in this free form, and our expert installers will be in touch.

solar battery on a wall

How much does a solar battery storage system cost?

A solar battery storage system costs £4,500, on average.

This is the cost for a 4kW solar battery, which is big enough to hold the excess electricity created by a 10-solar panel system – the one used by the average three-bedroom house.

The precise amount you’ll pay will depend on the size of your solar array, as well as the battery’s type and brand, but the great majority of purchases are in the £2,500-£6,000 range.

As a rough guide though, you should expect to pay £1,100 per kWp unless you have a house with at least 10 bedrooms, at which point the cost per kWp starts to plummet.

How many solar batteries are needed to power a house?

You’ll only need one solar battery to power your home, with the average battery able to keep the lights on all night after the sun goes down.

However, you should pick the right size of solar battery to ensure you have enough storage, but without paying over the odds.

These are just average prices, so use them to give you an idea of potential costs, then get at least three quotes from professional installers.

House sizeSolar panel sizeSolar battery sizeCost of battery
1-2 bedrooms2.1 kWp (6 panels)2.5 kWp£2,500
3 bedrooms3.5 kWp (10 panels)4 kWp£4,500
4+ bedrooms4.9 kWp (14 panels)5 kWp£5,500

Are solar batteries worth it in the UK?

Solar batteries are worth it in the UK, as they can significantly reduce your dependence on the grid – especially in the summer – meaning you won’t have to rely as much on an increasingly expensive, volatile supply.

You’ll also save 28 tonnes of greenhouse gas emissions over your solar array’s lifespan – the same amount as four people’s annual emissions.

And though it’ll take you longer, you’ll still break even on your solar panel system.

Without a battery, the average three-bedroom house will break even on its solar panels within 10.2 years, by using half of the solar power generated and selling the rest back to the grid through a Smart Export Guarantee tariff.

Solar batteries typically last between 10 and 15 years, meaning you’ll need to buy two over your panels’ 25-year lifespan.

This £9,000 expense will typically raise your overall break-even point on your solar setup to 20 years.

That’s a lot longer to wait, but you’ll still make a total profit of £3,590 on your solar array over its lifespan.

Additional solar battery costs

If you already have solar panels, you may have to purchase an additional inverter so you can get an AC (alternating current) battery, which is easier to fit into an existing system.

An inverter typically costs £800, and lasts for around 10 years. With any luck, you won’t have to replace it before you buy a new battery.

And don’t worry about maintenance costs.

Lithium-ion batteries, the most popular type of solar battery among homeowners, require barely any upkeep – just a bit of light dusting, and the occasional check-up to make sure they’re still holding charge properly.

Advantages and disadvantages of solar batteries

Here are the main pros and cons of solar batteries, with more details included under the table.

ProsCons
Protect yourself from energy price risesIt typically costs £4,500
Cut your energy bills by £186 per yearIt takes up space in your home
Prevent 28 tonnes of greenhouse gas emissionsIt won’t break even by itself
Never spend a power cut in the darkPointless if you have an electric vehicle
Make your home more saleable

Advantages

You’ll be much better protected from energy price rises, as nearly all of your electricity will come from solar power.

When you consider the average household is currently paying 71% more for electricity than it was a year ago, that sounds like an excellent idea.

You’ll save up to £844 per year, assuming you use all your solar energy, and will become less dependent on the grid for your energy.

A solar battery can also help you stop 28 tonnes of greenhouse gas emissions from entering the atmosphere – one of the best ways to reduce your carbon footprint.

If you ever lose power, your solar battery will ensure you have electricity to carry on living as normal for around 12 hours.

And you don’t have to worry about reselling your property.

65% of respondents told our latest National Home Energy Survey they'd buy a house with solar panels – and a system with a battery is even more attractive.

Disadvantages

The typical initial cost of £4,500 is steep when you’ve already spent around £5,400 on solar panels, as the average three-bedroom house would.

It’ll also push back your break-even point a further seven years, and take up roughly the same amount of space as a washing machine or combi gas boiler.

And it’s almost certainly pointless to get a battery if you already have an electric vehicle or are planning to get one, as you can just use your excess solar energy to recharge your car.

Should you get a solar battery?

If you want to take a significant step towards full energy independence, getting a solar battery is the right choice.

You can make your household immune from electricity price rises and power cuts, which is a temptingly high level of security.

Likewise, if you want to do your part in fighting climate change, a solar battery can save a colossal amount of greenhouse gases.

And you can still save money, making a net profit of £3,590 by the end of your solar panels’ lifespan.

However, if your main concerns are affording the upfront cost and breaking even as soon as possible on your solar setup, stick with solar panels alone.

And if you have an electric vehicle, don’t get a solar battery, as you already own a constructive, profitable place to send all that extra solar power: your car.

Next steps

By now, you’ve made up your mind on solar batteries.

The next step is to compare quotes on a solar PV system, whether it includes a battery or not.

Just complete this free form, and you can get free quotes from qualified installers. You’ll be taking advantage of solar power in no time.

josh jackman
Josh Jackman Senior Writer

Josh has written about eco-friendly home improvements and climate change for the past three years. His work has featured on the front page of the Financial Times; he’s been interviewed by BBC One; and he was the resident expert in BT’s smart home tech initiative.

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