UK battery storage guide · updated May 2026
Home battery storage UK: costs, savings & the best batteries for 2026
Compare Tesla Powerwall 3, FoxESS, SolarEdge, and more. Honest installed prices, real savings data, and independent reviews. Then get free quotes from MCS-certified local installers.
Is home battery storage worth it in the UK in 2026?
Home battery storage lets you store cheap electricity, either from your solar panels or from the grid at off-peak rates, and use it when prices are highest. With time-of-use tariffs now widely available, a 10kWh battery can save £550–£850 per year even without solar.
Paired with solar, the case becomes even stronger. A typical 5kW solar system without a battery exports around 40–50% of what it generates: electricity you're paid around 15p per unit for, versus the 26p+ you'd pay to import it. A battery captures that surplus and shifts it to your evening peak, doubling or even tripling your effective self-consumption.
Since February 2024, standalone battery storage qualifies for 0% VAT in the UK, a significant change that has improved the economics of retrofit installations. With battery prices down sharply and electricity prices rising, payback on a well-configured 10kWh system now typically runs 6–9 years, with batteries warranted for 10 years and expected to last 12–15 years.
The most important factors are choosing the right capacity for your home, finding a battery that works with your existing solar setup (if applicable), and pairing it with the right smart tariff. Our free comparison service navigates all of this: answer a few questions and we'll match you with up to 3 vetted, MCS-certified local installers.
How My Energy Expert works
Here's the process, from your first question to your first charge cycle.
Tell us what you need
Let us know if you already have solar, what size home you have, and whether backup power matters to you. Takes about 3 minutes.
We find the right installers
We match you with up to 3 MCS-certified battery installers in your area who have experience with the system size and brand you need.
Compare and choose
Receive tailored quotes. Compare warranty terms, battery models, supported tariffs, and backup capability, then choose with confidence.
Battery storage cost UK: 2026 price guide
Fully installed prices including battery, hybrid inverter (where applicable), labour, and commissioning. 0% VAT applies to residential battery installations.
| Capacity | Daily usable | Typical use | Installed cost | Annual saving* |
|---|---|---|---|---|
| 5 kWh | 4–4.5 kWh | Small home, solar top-up | £3,000–£4,500 | £350–£550 |
| 10 kWh | 9–9.5 kWh | Average 3–4 bed home | £4,500–£6,500 | £550–£850 |
| 13.5 kWh | 12.5–13 kWh | Larger home or EV charging | £5,500–£8,000 | £700–£1,000 |
| 20 kWh+ | 18–19 kWh | High consumption / whole-home backup | £8,000–£12,000 | £950–£1,400 |
* Annual savings based on time-of-use tariff arbitrage at a 19p spread (charge at 7p, avoid 26p/kWh peak under the July 2026 price cap), 250 charge cycles per year. Solar self-consumption savings are additional. Retrofit only: solar + battery combination costs and savings differ.
Why install a home battery?
Four reasons UK homeowners are investing in battery storage in 2026.
Store your solar, use it at night
Instead of exporting cheap surplus solar energy, store it and use it in the evening when grid electricity is at its most expensive.
Charge cheap overnight, save at peak
Charge cheaply overnight on Octopus Agile, Economy 7, or similar time-of-use tariffs. Discharge during peak periods to maximise savings.
Backup power during outages
Some battery systems (including Tesla Powerwall 3 and Sigenergy SigenStor) provide whole-home backup, keeping your lights, fridge, and broadband on during a grid outage.
Energy independence
A 5kW solar + 10kWh battery combination can cover 80–90% of a typical UK household's electricity needs across the summer months.
Compare the best home batteries in the UK in 2026
Independent reviews of the leading home battery systems available through MCS-certified UK installers. Tap any battery for full specs, pricing, and pros and cons. All prices are fully installed including hybrid inverter where applicable.
Tesla
Tesla
Tesla Powerwall 3
All-in-one battery and solar inverter with whole-home backup.
Expandable to 54 kWh- Capacity
- 13.5 kWh (expandable to 54 kWh)
- Power
- 11.04 kW
- Warranty
- 10 years
- From
- £7,000–£8,500
Tesla
Tesla Powerwall 3 + Expansion Pack
Double the storage on one inverter for heavy users and exporters.
Expandable to 54 kWh- Capacity
- 27 kWh (expandable to 54 kWh)
- Power
- 11.04 kW
- Warranty
- 10 years
- From
- £10,500–£13,000
FoxESS
FoxESS
FoxESS Energy Cube (EQ)
Floor-standing high-voltage modular battery with plug-and-play stacking.
Expandable to 41.93 kWh- Capacity
- 4.32–41.93 kWh (modular)
- Power
- 5 kW
- Warranty
- 10 years
- From
- £3,200–£9,000
FoxESS
FoxESS EP Series
High-voltage modular battery. Floor or wall mount, IP65.
Expandable to 41.6 kWh- Capacity
- 5.18–41.6 kWh (modular)
- Power
- 5 kW
- Warranty
- 10 years
- From
- £3,200–£7,800
FoxESS
FoxESS All-in-One (AIO)
Integrated inverter + battery: PowerQ Stackable AIO and Mini Qube.
Expandable to 41.9 kWh- Capacity
- 2.6–41.9 kWh (varies by model)
- Power
- 11 kW
- Warranty
- 10 years
- From
- £3,400–£9,000
Duracell
Duracell
Duracell Dura5
5.12 kWh UK-engineered LFP: 1C, stack or wall mount, 8,000 cycles.
Expandable to 73.6 kWh- Capacity
- 5.12 kWh module (4.6 kWh usable), stackable
- Power
- 5.1 kW
- Warranty
- 10 years
- From
- £2,500–£4,000
Duracell
Duracell Dura16 LV
16 kWh UK-engineered LFP battery: 8,000 cycles, fanless, IP65.
Expandable to 57.6 kWh- Capacity
- 14.4 kWh usable (scalable to 12 units)
- Power
- 6.6 kW
- Warranty
- 10 years
- From
- £4,500–£7,500
SolarEdge
SolarEdge
SolarEdge Home Battery 48V
DC-coupled modular LFP storage for SolarEdge systems.
Expandable to 23 kWh- Capacity
- 4.6–23 kWh (modular)
- Power
- 5 kW
- Warranty
- 10 years
- From
- £3,800–£7,500
SolarEdge
SolarEdge Home Battery 400V
DC-coupled 9.7 kWh battery for SolarEdge Home Wave / StorEdge.
Expandable to 29.1 kWh- Capacity
- 9.7 kWh (stackable to ~29 kWh)
- Power
- 5 kW
- Warranty
- 10 years
- From
- £5,000–£6,500
Growatt
Growatt
Growatt ARK XH
High-voltage modular LFP stack for Growatt MIN-XH systems.
Expandable to 17.92 kWh- Capacity
- 5.12–17.92 kWh (modular)
- Power
- 5 kW
- Warranty
- 10 years
- From
- £3,200–£6,500
Growatt
Growatt ARK LV
Budget low-voltage (51.2 V) modular LFP storage.
Expandable to 25.6 kWh- Capacity
- 2.56–25.6 kWh (modular)
- Power
- 5 kW
- Warranty
- 10 years
- From
- £2,500–£5,400
Growatt
Growatt APX
Premium high-voltage modular battery with module-level optimisation.
Expandable to 30 kWh- Capacity
- 5–30 kWh (modular)
- Power
- 12 kW
- Warranty
- 10 years
- From
- £4,200–£10,000
Installed prices are indicative based on typical UK installer quotes in 2026. Actual quotes will vary by region, existing installation, and battery configuration.
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Battery storage FAQs
How much does home battery storage cost in the UK in 2026?
A home battery storage system typically costs £3,000–£8,000 for a standalone unit installed in 2026, depending on capacity and brand. A 10kWh system such as the FoxESS Energy Cube costs around £4,000–£6,000 installed, while a Tesla Powerwall 3 (13.5kWh) costs £7,000–£8,500 installed. Prices fall when combined with a new solar installation.
How much can a home battery save me per year?
Savings depend on your tariff and usage pattern. On a time-of-use tariff like Octopus Agile or Intelligent Octopus, a 10kWh battery can save £500–£850 per year by charging at off-peak rates (as low as 7p/kWh overnight) and discharging during peak periods (26p+ per kWh under the July 2026 price cap). Combined with solar, self-consumption savings can reach £1,000–£1,400 per year for a 5kW solar + 10kWh battery system.
Can I add a battery to my existing solar panels?
Yes. Most modern batteries can be retrofitted to an existing solar installation. AC-coupled systems work alongside any existing inverter, while DC-coupled systems require a compatible hybrid inverter. An MCS-certified installer will assess your current setup and recommend the right integration approach.
How long does a home battery last?
Most home batteries carry a 10-year warranty from the manufacturer, typically guaranteeing at least 70% of original capacity at end of warranty period. Real-world lifespan is often 12–15 years or longer with normal use. The number of charge cycles is the main limiting factor. Most modern lithium iron phosphate (LFP) batteries are rated for 4,000–6,000 full cycles.
Is there VAT relief on battery storage in the UK?
Yes. Since February 2024, standalone battery storage systems installed at residential properties qualify for 0% VAT in the UK. You no longer need to combine a battery with solar panels to get the tax relief. This has significantly improved the economics of retrofit battery installations.
What is the best home battery in the UK?
It depends on what you need it to do. Compare batteries on usable capacity, peak power output, warranty (years and cycles), backup capability, and installed price. A larger battery with an integrated inverter suits a new solar-plus-battery install; a retrofit needs one that works with your existing inverter. Our side-by-side comparison tool puts the systems in our catalogue next to each other, and the Battery Finder suggests a capacity for your usage, then an MCS-certified installer confirms the final spec.
Related guides
Solar panels and battery storage: should you combine them?
Adding a battery can double your self-consumption. We break down when the numbers stack up and when they don't.
Read guideBest time-of-use tariffs for battery storage in 2026
Octopus Agile, Intelligent Octopus, Economy 7: which tariff works best with a home battery, and how much can you save?
Read guideSolar panel grants and funding in 2026
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