- A well matched solar battery for a 5-10 kW home solar system will cost £2,500 to £6,000 depending on capacity.
- Adding a battery can boost the amount of solar power you can use by 50% to 85%, and installation costs are currently discounted by a 20% VAT saving.
- The best time to install a solar battery is during the solar panel installation otherwise you double-pay for scaffolding and other charges.
- Most modern Lithium-ion batteries still operate at 70% capacity after 10 years or 6000 charge cycles.
- Working out if a battery makes sense depends when you use it, your export rates and energy costs, use our interactive calculator below to map your exact payoff.
How Much Do Solar Batteries Cost?
Adding battery storage to your solar panel system has become increasingly popular, with 94% of new solar installs now including a battery.
But working out if they make sense is genuinely tricky, you need to map out not just the purchase price, which can run from £3,000 to £10,000 and up, but your export rates, when you use it, your system size, and even model the energy inflation cost over the next 10-15 years to get an accurate picture.
To make it easier to understand we built this solar battery payback calculator (links to the mini app right after the prices), we highly recommend using it before deciding to see how all the factors come together.
Solar Battery Costs in 2026
- ✓ Installed costs: £3,000–£10,500 depending on capacity and brand
- ✓ £500–£780 per kWh installed (battery only: £250–£500/kWh)
- ✓ Typical savings: £300–£1,000/yr depending on tariff and usage
- ✓ Payback: 6–12 years (faster with a smart tariff)
Solar battery prices in the UK vary somewhat based on storage capacity, brand, and whether you’re installing alongside new solar panels or adding to an existing system.
Price by Capacity
Average UK solar battery prices in 2025/26, fully installed including 0% VAT. “Battery only” shows the hardware cost before labour and wiring.
| Battery Capacity | Price Range (Installed) | Typical Use Case |
|---|---|---|
| 3–4 kWh | £2,500–£4,000Battery only: £1,200–£2,200 | Small homes, 1–2 people, low evening usageBUDGET ENTRY POINT |
| 5–6 kWh | £3,500–£5,500Battery only: £1,600–£3,000 | Average 2–3 bed home. Most popular UK size — good for smart tariff arbitrageMOST POPULAR |
| 8–10 kWh | £4,500–£7,000Battery only: £2,800–£4,500 | 3–4 bed home with moderate-to-high usage. Best balance of cost vs savingsSWEET SPOT |
| 13–15 kWh | £5,500–£10,500Battery only: £4,000–£7,500 | Large 4+ bed home, high evening demand, or offsetting an EV’s extra draw on the householdFUTURE-PROOF |
Battery-only hardware costs around £250–£500 per kWh, the higher you go the lower the price.
New Installation vs Retrofit
Adding a solar battery alongside new solar panels is quite a bit cheaper than retrofitting later:
- With new solar: £3,000–£5,000 for a 5 kWh battery (shared labour and inverter costs)
- Retrofit: £4,500–£6,500+ for the same battery (separate visit, potential inverter swap, extra wiring)
Solar Battery Cost Calculator
Use this free calculator work out if a solar battery makes sense for your setup. It’s modelled using a 5% average annual energy inflation rate, which is pretty conservative.
Popular Battery Brands and Prices
| Battery | Capacity | Installed Cost | Warranty | |
|---|---|---|---|---|
| 🔋 Small Batteries (3–5 kWh) — best for flats, WFH users, budget installs | ||||
| Duracell Dura5Duracell / PuredriveBUDGET PICK | 5.12 kWh | £3,500–£4,500 | 10 years | |
| Pylontech Force-H2PylontechCHEAPEST PER kWh | 4.84 kWh | £3,000–£4,200 | 10 years | |
| Fox ESS Energy Cube EQ2900Fox ESSBEST VALUE | 5.76 kWh | £3,500–£4,800 | 12 years | |
| EcoFlow PowerOceanEcoFlow15-YEAR WARRANTY | 5.1 kWh | £3,800–£5,000 | 15 years | |
| Enphase IQ Battery 5PEnphaseBEST FOR RETROFIT | 5 kWh | £4,500–£6,000 | 15 years | |
| AlphaESS SMILE-G3AlphaESS | 4.8 kWh | £3,500–£5,000 | 10 years | |
| 🔋🔋 Medium Batteries (8–10 kWh) — the sweet spot for most UK homes | ||||
| GivEnergy 9.5 kWhGivEnergy (UK)UK FAVOURITE | 9.5 kWh | £4,500–£6,000 | 12 years | |
| Huawei LUNA 2000-10Huawei | 10 kWh | £5,000–£6,500 | 10 years | |
| Sigenergy SigenStor 10Sigenergy5-IN-1 SYSTEM | 10 kWh | £5,000–£7,000 | 15 years | |
| Puredrive PureStorage IIPuredrive (UK) | 10.08 kWh | £5,500–£7,000 | 10 years | |
| 🔋🔋🔋 Large Batteries (13–16 kWh) — for bigger homes, EVs, and maximum savings | ||||
| Tesla Powerwall 3TeslaPREMIUM PICK | 13.5 kWh | £8,000–£10,500 | 10 years | |
| GivEnergy All-in-One 2GivEnergy (UK)UK ECOSYSTEM PICK | 13.5 kWh | £5,500–£7,500 | 12 years | |
| Fox ESS EP12Fox ESS | 11.52 kWh | £5,500–£7,000 | 10 years | |
| SolaX T-BAT D150SolaX | 15 kWh | £6,000–£8,000 | 5 years | |
| LG Enblock E15LG Energy Solution | 15.5 kWh | £7,000–£8,500 | 10 years | |
*Prices include installation and are approximate as of January 2026. Actual costs vary by installer and configuration.
What’s Included in the Price
A typical battery installation quote should include:
- Battery unit(s)
- Inverter (if not built-in or already compatible)
- Mounting hardware and enclosure
- Electrical connections and wiring
- Installation labour
- Commissioning and setup
- Registration with relevant bodies
If you install your battery at the same time as your panels, expect to pay £300 to £800 extra for installation cost only. Retrofitting later will cost about £800 – £1500 and you’ll still be able to claim the 20% VAT discount.
0% VAT on Solar Batteries
Since February 2025, solar battery storage systems in the UK benefit from 0% VAT (previously 20%). This applies to:
- Batteries installed with new solar panel systems
- Batteries retrofitted to existing solar installations
- Standalone battery systems connected to the grid
So a £6,600 battery before will now cost £5,500. That’s a nice saving of £1,100
What Affects Solar Battery Costs?
Battery prices vary a lot, even for the same capacity. Here’s what’s actually driving the difference.
Storage Capacity (kWh)
The larger the battery, the more it will cost in total, but the price per kWh will usually go down. A 5 kWh GivEnergy system works out around £700/kWh installed, while a 13.5 kWh Tesla Powerwall 3 is closer to £520/kWh.
Battery Chemistry
Lithium iron phosphate (LFP) batteries are the best, safest and most common. They’re good for 10,000 cycles. NMC (nickel manganese cobalt) are smaller but don’t last as long, around 6,000–8,000 cycles. Ignore lead-acid batteries as they’re cheap but only last 3–5 years.
Integrated vs Separate Inverter
Some batteries come with a built-in inverter, and are easier to install like the Tesla Powerwall 3 and Sigenergy SigenStor. Others need a separate hybrid inverter. If you retrofit a battery you might need to replace your inverter, which adds to the cost.
Brand and Quality
You get what you pay for, mostly. Premium brands like Tesla and GivEnergy charge more but come with better apps, smarter tariff integration, and longer warranties. Cheaper options like Pylontech and Duracell can still be good, just check they support the smart tariff features you’ll need, because that’s where most of your savings come from.
Installation Complexity
Most installs are straightforward, but costs go up if you need an inverter replacement, significant rewiring, outdoor mounting, or a three-phase connection. Retrofitting a battery to an existing solar system typically costs more than adding one at the same time as panels, expect £4,500–£6,500+ for a retrofit versus £3,000–£5,000 bundled with a new install.
How Much Can You Save With a Solar Battery?
Rather than constantly selling your excess energy, and then buying it back at higher rates, adding a battery lets you bypass this process, and use up to 80% of what you generate.
Every time you store a kWh, you save the difference between your import and export rate. Around 10p–23p per kWh. These savings get vastly amplified when you add a smart tariff.
Time-of-Use Tariffs: The Game Changer
Smart tariffs let you buy energy at night for around 7–8p and use it in the day, when you’d otherwise be paying 29p–35p. This is where batteries really start to make sense.
Adding a smart tariff can save you £300 to £550 per year extra, on top of solar shifting.
| Tariff | Off-Peak Rate | Peak Rate | Key Feature |
|---|---|---|---|
| Intelligent Octopus Go | ~7p/kWh (23:30–05:30) | ~29p/kWh | 6 hours cheap, smart scheduling |
| Octopus Go | ~8.5p/kWh (00:30–05:30) | ~29p/kWh | 5 hours cheap, no smart kit needed |
| Octopus Flux | ~15p/kWh (02:00–05:00) | ~35p/kWh (16:00–19:00) | Premium export rates during peak |
What Size Battery Do You Need?
| Home Size | Solar System | Recommended Battery |
|---|---|---|
| 1–2 bed flat/house | 2–3 kWp | 3–5 kWh |
| 2–3 bed house | 3–4 kWp | 5–8 kWh |
| 3–4 bed house | 4–5 kWp | 8–10 kWh |
| 4+ bed house | 5–6 kWp+ | 10–15 kWh |
Evening use matters most: Most homes use 60% of their power in the evening, when people are back from work. Your battery covers the period where there’s no sun, and rates are still high.
Don’t oversize: If you only export 4 kWh per day, a large 13 kWh battery will sit empty most of the time. Your installer will help you size it accurately.
Plan now for the future: The install costs, and current prices are likely the lowest you’ll get, so if you plan on getting an EV later, it’s wise to account for that now.
Battery Specs That Actually Matter
Battery spec sheets are full of jargon. Here’s what’s worth paying attention to, and what you can mostly ignore.
Depth of Discharge (DoD)
This is how much of the battery you can actually use. A 10 kWh battery with 90% DoD gives you 9 kWh — the rest is locked off to protect the cells. Most modern lithium batteries offer 90–100% DoD, so it’s not really a stat that changes things much. Avoid lead-acid batteries, which only let you use about half their capacity.
Cycle Life
One cycle = one full charge and discharge. Good lithium batteries are rated for 6,000–10,000+ cycles, which is 20+ years under normal use (300 cycles per year, also accounting for degradation). In most cases, they will usually outlast their warranty. Higher cycle rated batteries last longer.
Capacity Degradation
Every battery loses 0.003% to 0.007% per charge cycle. So 3–7% every 1,000 cycles. Not much difference between brands, pretty standard for the technology in general.
Smart Features
This is where you want to pay attention. Top systems offer an app with monitoring and alerts, automatic tariff optimisation, weather forecast integration, and the ability to earn money with grid services. Just make sure you’re using the (recommended) smart tariff, and that your battery is compatible.
Backup Power
Most batteries won’t keep your home running during a power cut, by design. This stops excess power being sent back to a ‘dead’ grid during a power cut (dangerous for engineers). If you need emergency power, you’ll need a battery with EPS (emergency power supply) which is good for a few sockets. For full home power you’ll need an automatic switchover with more complex install requirements like DNO approval. Expect £1,000 to £3,000 extra.
Are Solar Batteries Worth It?
When Batteries Make Sense
Figuring out if you need a solar battery can be done in two steps, first with today’s electricity prices, and second by modelling future price rises.
If you just purely look at today’s rates, they make sense in around 40% of cases. But once you factor in energy cost inflation they almost always make sense. That’s why 94% of new installs have them.
It basically comes down to the fact you can lock in today’s price for the next 15-25 years and beat a 3-6% annual rate rise.
With that said, here’s where they make sense looking purely at today’s costings:
- You’re home in the evenings: If you work normal daytime hours, and use most of your electric at peak rates, then that’s a plus factor.
- You use a smart tariff: Basically required for a solar battery to make sense.
- You’re installing panels now: 20-30% cheaper at time of install.
- You’re getting or have an EV: EV users are reporting additional savings of £150 – £460 per year by adding a battery.
- You want energy independence guaranteed: Feels good knowing if energy issues rise in the future, you’ll be secure.
When They’re Probably Not Worth It
If you’re home during the day and out in the evenings, you can take advantage of being in sync with the sun. You don’t export that much to the grid (batteries replace that buy/sell cycle). You don’t want to get a smart tariff. Or you’re moving soon.
The Long-Term View
Payback of 6-10 years sounds long, but most batteries last 15+ years and come with 10-year warranties. Once paid back, the savings are pure profit. Energy prices are also rising at around 3-6% a year, which means the savings in year 10 will be significantly higher than year 1. The calculator above models this for your specific setup.
Grants and Financial Support
Available in 2026
There are many local and national grants for solar and energy saving tech in 2026, for the full list see our solar panel grants page.
But the four main ones are:
Open to everyone
0% VAT: Anyone installing solar panels, and solar batteries pays 20% less with this discount.
SEG: Sell your excess energy back to whichever energy supplier you choose (they have different rates), and profit from unused power.
Means tested grants
Warm Homes: Local Grant: This one comes in two flavours, a means tested grant for low income households which can fund the full cost of your solar panels, batteries and other energy saving tech. For everyone else there will be low or zero rate loans to fund your install.
ECO4 Scheme: Another means tested grant for low income households, recently extended until December 2026 and can fund the full cost of a solar panel install.
Frequently Asked Questions
Are there any running costs for a solar battery?
Very minimal, if any. Most lithium-ion batteries are set and forget. Any rare issues should be covered by the warranty.
Do solar batteries affect insurance costs?
They can, by a very small amount of around £10-£40. It’s best to check your policy wording or speak with your insurer directly.
Does a solar battery affect your home’s value?
Adding solar panels adds around 1-3% to a home’s value. If you add a battery it may increase by 2-4% with correct marketing, and the right buyer. It will almost never decrease it, unless you have a solar rental contract where a third party owns the panels.
Is there any end-of-life cost for a solar battery?
Most installers will guarantee they’ll take it back at the end of its life. If there is 70%+ remaining they can be sold for £300 to £900 or more. With 60%+ left you may get a token amount from hobbyist buyers.
Can you make money with a solar battery from grid services?
You can get £50-£150 a year for grid services, which is essentially helping to keep the energy grid stable. You join with an aggregator like Octopus Energy who’ll handle everything for you.
Summary
If you made it this far, you should have a pretty solid understanding of whether a solar battery makes sense for you, how much solar batteries cost, and what funding you can get.
The next step is finding a quality local installer who can fit your battery, provide servicing and ongoing technical support.
We highly recommend getting at least 4 quotes. There are extra savings to be had by shopping around.
