Home Battery Storage Cost: 2026 Solar Battery Prices UK
A home battery stores electricity so you can use it later. If you have solar panels, it soaks up the power you generate during the day and releases it in the evening, when you would otherwise be buying from the grid. Without solar, a battery can still save money by charging on a cheap overnight tariff and running the house at peak times.
The catch is the price. An entry level 4kWh battery costs around £4,000 supplied and installed, and larger systems run to £12,000 or more. Whether that is a good deal depends on how you use electricity, what tariff you are on, and how long you plan to stay in your home.
This guide sets out what batteries cost in 2026, what goes into an installation, how to work out payback honestly, and what to look for when you compare products.
Compare Quotes & Save Up To 37%:
Prices by kWh
Battery prices are driven mainly by capacity, measured in kilowatt hours (kWh). The more energy a battery can store, the more it costs, although the price per kWh usually falls as you go bigger.
| Battery size | Typical installed cost |
|---|---|
| 4kWh (entry level) | about £4,000 |
| 5kWh | about £5,000 |
| 16kWh (large) | about £12,000 |
Checked October 2026: Checkatrade, Solar battery storage costs guide (cost table last updated March 2025).
Breaking down a 4kWh system
Checkatrade splits the cost of a typical 4kWh setup like this:
| Item | Typical cost |
|---|---|
| 4kWh lithium ion battery | about £3,500 |
| Installation of the battery | about £500 |
| 4kW inverter (if you need one) | about £900 |
| 4kW solar PV system (if you do not have one) | about £7,100 |
| Battery, inverter and solar together | about £12,000 |
Checked October 2026: Checkatrade, Solar battery storage costs guide.
If you already have solar panels and a hybrid inverter that can take a battery, you may only need the battery and installation. If your inverter is not battery ready, you will need either a new hybrid inverter or an AC coupled battery with its own built in inverter.
Price per usable kWh
When comparing quotes, divide the price by the usable capacity rather than the headline figure. Some batteries cannot be fully emptied without shortening their life, so a "5kWh" battery might only give you 4.5kWh of usable energy.
Published retail prices give a useful benchmark. EnergyPicker's review of UK published prices puts complete battery and inverter kits at about £364 to £650 per usable kWh including VAT, before installation (checked October 2026). A quote far above that range deserves questions.
VAT
Batteries installed in homes currently qualify for the 0% VAT rate on energy saving materials, whether fitted with solar panels or added later. Check that your quote reflects this. If an installer adds 20% VAT to a domestic battery installation, ask why.
Premium options
Big name batteries with sleek designs and strong apps cost more. Checkatrade's guide to Tesla Powerwall installers puts a Powerwall at about £6,000 plus £900 for the gateway before installation, with a supplied and installed Powerwall 2 and gateway typically around £8,000 to £10,000 (checked October 2026). Adding solar, extra units or a complex installation can take the total past £20,000.
Installation
Fitting a home battery is a job for a certified installer. It involves high voltage DC wiring, connection to your consumer unit, and notification to your electricity network operator.
What happens on the day
- The installer checks the location, ventilation and wall strength.
- The battery and inverter are mounted, usually in a garage, utility room or outside on a wall.
- Cables are run to the consumer unit and, if you have solar, to the panels' inverter.
- The system is connected, tested and set up on the app.
- The installer explains how to set charging schedules and backup settings.
Most domestic installations take a day. If you are fitting solar panels at the same time, allow two or three days and scaffolding.
Where can a battery go?
Batteries are heavy and need a solid wall or floor. Manufacturers set limits on temperature, so a cold, unheated outbuilding or a hot loft may not be suitable. Garages and utility rooms are common choices. Some batteries are rated for outdoor use.
Fire safety guidance and manufacturer instructions affect where a battery can go inside the home. A good installer will explain why they have chosen the spot.
Certification
Look for an installer certified under the Microgeneration Certification Scheme (MCS) for battery storage. MCS certification matters if you want to sell spare electricity through the Smart Export Guarantee, and it gives you access to a consumer code for complaints. The installer should also be a registered electrician who can certify the work. See our guide to electricians for how to check.
Extra costs to watch for
- Consumer unit upgrade if your fuse board has no space or is outdated
- New hybrid inverter if your solar inverter cannot take a battery
- Backup power kit if you want the battery to keep lights on in a power cut, which is not standard on every system
- Scaffolding if solar panels are being installed or moved at the same time
- Network operator approval for larger systems, which can delay installation
Payback
Payback is where sales brochures and reality often part company. A battery does not generate electricity. It shifts it from one time of day to another. The saving per unit is the difference between what you would have paid for that electricity and what it cost you to store it.
The basic sum
Yearly saving = usable kWh stored per day × days used per year × (price you avoid paying minus price of the stored energy)
Payback in years = installed cost ÷ yearly saving
Example 1: storing solar surplus
These figures are illustrative assumptions, not quotes.
- 4kWh battery, installed for £4,000
- Fills from solar on about 250 days a year
- Each stored unit replaces grid electricity at about 26p
- Without the battery, that unit would have been exported at 15p
Saving: 4 × 250 × (26p minus 15p) = £110 a year. Payback: over 30 years.
That is longer than the battery is likely to last, which is why a battery bought only to store solar can be hard to justify on money alone when export rates are good.
Example 2: overnight tariff shifting
- Same 4kWh battery at £4,000
- Charged every night on an off peak rate of 7p
- Used at peak times instead of buying at 26p
Saving: 4 × 365 × (26p minus 7p) = about £277 a year. Payback: about 14 years.
Example 3: solar plus tariff
Many households combine both: charging from solar in summer and from cheap overnight power in winter. That can raise use of the battery to most days of the year and improve payback further. A larger battery helps only if you have enough cheap or surplus energy to fill it and enough evening use to empty it.
What changes the sums
- Your tariff. Time of use tariffs with a big gap between night and peak prices make batteries more valuable.
- Export rates. The more you are paid to export, the less you gain by storing instead.
- Battery life. Lithium ion batteries are commonly quoted at 10 to 15 years, or about 6,000 cycles. A battery that fails before payback never pays back.
- Energy price changes. Higher prices shorten payback. Lower prices lengthen it.
- Your habits. If you are out all day and home in the evening, you will use more stored energy than someone at home all day using solar power directly.
Battery lifespan figures checked October 2026: Checkatrade, Solar battery storage costs guide. Unit price assumption based on the October 2026 Ofgem price cap of around 26p per kWh; your tariff may differ.
Best brands
There is no single best battery. The right one depends on your solar setup, your space, your budget and whether you want backup power. Rather than rank brands, here is what separates a good battery from a disappointing one.
What to compare
| Feature | Why it matters |
|---|---|
| Usable capacity | The energy you can actually use, not the headline figure |
| Power output (kW) | How many appliances it can run at once |
| Round trip efficiency | How much energy you lose storing and releasing it |
| Warranty length and terms | Years, cycles and the capacity guaranteed at the end |
| Backup capability | Whether it powers the home in a power cut |
| App and tariff integration | Whether it can follow your tariff automatically |
| Expandability | Whether you can add capacity later |
| Installer network | Whether local installers support it |
Well known names
The UK market includes integrated systems such as the Tesla Powerwall, and battery and hybrid inverter ranges from manufacturers including GivEnergy, Fox ESS, SolarEdge, Huawei and others. Energy suppliers also sell battery packages with installation. Prices, specifications and warranties change frequently, so compare current datasheets rather than relying on reviews from a few years ago.
Warranty small print
Most warranties guarantee that the battery will hold a certain share of its original capacity after a number of years or cycles, whichever comes first. A warranty of 10 years but a low cycle count may run out sooner if you cycle the battery twice a day. Read both numbers.
AC coupled vs DC coupled
You will see these two terms in almost every battery quote, and they affect both price and efficiency.
A DC coupled system connects the battery to a hybrid inverter that also handles your solar panels. Solar power can go straight into the battery without being converted to AC and back again, which wastes a little less energy. It is usually the neater choice when you install solar and a battery together, or when your existing inverter needs replacing anyway.
An AC coupled battery has its own inverter and connects to your home's AC wiring. It works alongside any existing solar inverter, so it is often the simplest way to add storage to panels that were installed years ago. Each conversion loses a little energy, so it can be slightly less efficient, but it avoids replacing a working inverter.
Neither is better in every case. Ask the installer why they recommend one over the other for your home.
Battery chemistry
Most home batteries sold in the UK use lithium ion cells, but there are different types. Lithium iron phosphate (often written LFP or LiFePO4) has become common in home storage because it handles many charge cycles and is considered thermally stable. Other lithium chemistries pack more energy into a smaller space. Older lead acid batteries are cheaper but bulkier, less efficient and shorter lived, and are now rarely used for new home installations.
The chemistry matters less to most buyers than the warranty, usable capacity and installer support, but it is worth asking about.
How to read a battery quote
A clear quote should list:
- The battery make, model and usable capacity
- The inverter make and model, or confirmation that your existing one is compatible
- Whether backup power is included, and which circuits it covers
- Installation, cabling, any consumer unit work and commissioning
- Network operator notification
- VAT treatment, which should be 0% for a qualifying domestic installation
- Warranty on the battery, inverter and installation workmanship
- MCS certificate and any consumer code membership
If two quotes are thousands of pounds apart, line them up item by item. The difference is usually capacity, backup power or the inverter.
Living with a battery
Once installed, a battery mostly looks after itself. The app shows how much energy you have stored, where your power is coming from and how much you have saved. You can usually choose between modes, such as maximising self use of solar, charging from the grid at cheap times, or keeping a reserve for power cuts.
It pays to revisit those settings when your tariff changes or the seasons turn. In summer, solar may fill the battery every day. In winter, grid charging overnight may do more of the work. Some apps and tariffs handle this switch automatically.
Is a battery worth it?
A battery makes most sense if:
- You already have solar panels and export a lot of power in summer
- You can get a time of use tariff with a large gap between off peak and peak prices
- You plan to stay in the property long enough to see payback
- You value backup power during power cuts
- You have an electric car or heat pump that increases your evening demand
It makes less sense if your electricity use is low, your export rate is generous, or you expect to move within a few years.
If you do not have solar yet, our guide to solar panel costs explains what a system costs and how much it generates. Adding the battery at the same time as the panels avoids paying for two installations.
Batteries and EV charging
An electric car has a far bigger battery than any home unit, so a home battery rarely fills a car on its own. Where a battery helps is in taking the load off your supply in the evening, or storing cheap overnight energy that your home uses during the day. If you are installing a charger too, see our EV charger installation guide.
Grants and funding
There is no national grant for home batteries alone in 2026. The main financial help is the 0% VAT rate. Some councils include batteries in wider energy upgrade schemes for eligible households, such as the Warm Homes: Local Grant in England, which can fund measures including solar for homes that meet income and EPC criteria. Check with your council.
FAQs
How long do home batteries last?
Most lithium ion home batteries are quoted at 10 to 15 years, or a set number of charge cycles. That is shorter than the 20 to 30 year life of solar panels, so you may replace the battery once or twice over the life of a solar system.
What size battery do I need?
Look at your evening and overnight use. Many homes use 4kWh to 8kWh between sunset and bedtime. A battery much bigger than that will often sit part full.
Can a battery power my home in a power cut?
Only if it has backup functionality and has been installed with it. Many systems shut down during a grid outage for safety unless specifically set up for backup.
Can I add a battery to existing solar panels?
Yes. Either replace your inverter with a hybrid model, or fit an AC coupled battery that has its own inverter. Your installer will advise which is cheaper for your setup.
Do batteries need maintenance?
Very little. Keep the area around the unit clear, install software updates, and have the installer check it if the app reports a fault.
Do I need planning permission for a home battery?
Usually not for a battery inside the home or garage. Listed buildings and some external installations may need consent.
Will a battery affect my home insurance?
Tell your insurer. Most will cover a properly certified installation, but they need to know about it.
Get quotes
Ask at least three MCS certified installers to quote on the same specification. Give them a year of electricity bills or smart meter data, details of any solar panels and inverter, and your tariff. A good installer will size the battery to your usage rather than sell you the biggest one on the van.
Compare Quotes & Save Up To 37%: