Quick answer: The best solar battery for most UK homes in 2026 is the one matched to your use-case, not a single winner. Sigenergy SigenStor leads for whole-home backup and EV pairing; Tesla Powerwall 3 for simplicity; GivEnergy for value and SEG flexibility; Fox ESS and Sunsynk for off-grid-style resilience.
How we ranked the best solar batteries for UK homes
We compared the six battery systems YEERS installs most across Hull, East Yorkshire, North Yorkshire and Lincolnshire on the metrics that actually affect your bills and bill-shock during outages: usable capacity, continuous power output, whether they deliver true whole-home backup, warranty length, and indicative installed cost per usable kWh. All systems below qualify for 0% VAT when supplied and installed for a UK home — this relief applies to solar PV, battery storage (including standalone batteries since 1 February 2024) and heat pumps until 31 March 2027, after which it reverts to 5% on 1 April 2027 (HMRC VAT Notice 708/6). Many competitors wrongly quote 31 January 2027 — the correct deadline is 31 March 2027.
Best solar batteries UK 2026: comparison table
| Battery | Usable capacity | Continuous power | Whole-home backup | Warranty | Indicative £/usable kWh | Best for |
|---|---|---|---|---|---|---|
| Sigenergy SigenStor | 5–48 kWh (modular) | ~5–12 kW (model-dependent) | Yes (true whole-home) | ~15 years | ~£750–£950 | Whole-home backup + EV charging |
| Tesla Powerwall 3 | 13.5 kWh | 11.5 kW (integrated inverter) | Yes | 10 years | ~£700–£900 | Simplicity & high power output |
| GivEnergy (All-in-One / Gen3) | ~9.5–13.5 kWh | ~5–6 kW | Partial / backup-ready | ~10–12 years | ~£700–£850 | Value & SEG tariff flexibility |
| Fox ESS (ECS / EP series) | ~5–20 kWh (stackable) | ~3.7–5 kW | Backup-ready (EPS) | ~10 years | ~£700–£800 | Scalable, budget-conscious homes |
| Solax (Triple Power) | ~5.8–17.4 kWh (stackable) | ~5 kW | Backup-ready (in Solax ecosystem) | ~10 years | ~£700–£850 | Pairing within a Solax inverter system |
| Sunsynk | ~5.12–20+ kWh (stackable) | ~5–8 kW | Yes (strong off-grid/EPS) | ~10 years | ~£700–£900 | Resilience & frequent-outage areas |
Figures are indicative, verified June 2026, and vary by model, install complexity and battery sizing — always confirm exact specifications on quote. Typical installed battery cost runs ~£700–£950 per usable kWh.
Verdict by use-case
Best for whole-home backup: Sigenergy SigenStor
The Sigenergy SigenStor is an all-in-one unit combining inverter, modular battery (5–48 kWh) and an optional DC EV charger in a single enclosure. It delivers genuine whole-home backup — not just a couple of essential circuits — and carries a roughly 15-year warranty, the longest in this group. If you want one system that runs solar, storage and EV charging with the longest cover, it's our top pick. For a head-to-head on inverter ecosystems, see our Sigenergy vs Solax comparison.
Best for simplicity and power: Tesla Powerwall 3
Powerwall 3 integrates the inverter into the battery, so a single 13.5 kWh unit handles solar conversion, storage and backup with a strong 11.5 kW continuous output. It's the cleanest single-box install for a typical 3–4 bedroom home and a reliable default if you value a proven brand over modular flexibility. The trade-off is a shorter 10-year warranty than the Sigenergy.
Best for value and SEG flexibility: GivEnergy
GivEnergy's All-in-One and Gen3 systems offer keen pricing per usable kWh and excellent software control over charge/discharge windows — ideal for time-of-use export tariffs. Pairing one with Intelligent Octopus Flux lets you charge cheaply overnight and export at peak (up to ~27p/kWh), sharpening your payback. Read more on sizing and fitting in our battery storage guide.
Best for scalable, budget homes: Fox ESS & Solax
Both Fox ESS and Solax use stackable modules, so you start small and add capacity later. Solax Triple Power pairs cleanly within the Solax inverter ecosystem and is strong value; Fox ESS suits households wanting backup-ready storage (EPS) on a tighter budget. Neither is built for heavy whole-home backup, but for everyday self-consumption they're efficient performers.
Best for outage resilience: Sunsynk
Sunsynk has off-grid heritage and robust EPS performance, making it a sensible choice in rural Lincolnshire and East Yorkshire properties that see more frequent grid interruptions. Capacity stacks comfortably past 20 kWh for larger or all-electric homes.
How a battery improves your solar payback
Adding storage lets you use more of your own generation instead of exporting it cheaply and re-buying at the full import rate. A typical 4kW solar system costs £6,200–£8,200 installed (with 0% VAT) and generates ~3,400–3,650 kWh/yr in Yorkshire, covering 60–75% of a home's electricity. Solar-only payback runs ~7–11 years; adding a battery with a strong Smart Export Guarantee (SEG) tariff typically shortens that.
On SEG, any supplier with 150,000+ customers must offer an export tariff (Ofgem). Rates range from about 1p to 27p/kWh. In 2026 the strongest options are Octopus Outgoing Fixed (~15p flat) and peak-paying tariffs like Intelligent Octopus Flux and Outgoing Agile (up to ~27p at peak); EDF, OVO, E.ON Next, British Gas, Scottish Power, So Energy and Good Energy also pay, often 3p–15p. You need an MCS certificate and a smart meter with half-hourly readings to qualify.
| SEG tariff (indicative) | Approx. rate | Structure |
|---|---|---|
| Intelligent Octopus Flux | up to ~27p/kWh | Time-of-use, peak premium |
| Octopus Outgoing Fixed | ~15p/kWh | Flat rate |
| Outgoing Agile | up to ~27p/kWh | Half-hourly, variable |
| EDF / OVO / E.ON Next / British Gas | ~3p–15p/kWh | Varies by supplier |
Rates indicative — verified June 2026; check directly with each supplier as terms change.
What to check before you buy
- Usable vs nominal capacity: always compare usable kWh — that's what you can actually draw.
- Backup type: confirm whether it's true whole-home backup or essential-circuits only.
- Warranty terms: check cycles/throughput and end-of-warranty capacity, not just the year count.
- Installer accreditation: insist on an MCS-certified installer — it's required for SEG and protects your warranty.
- 0% VAT: ensure supply-and-install is invoiced with 0% VAT while the relief runs to 31 March 2027.
YEERS is a Hull-based, MCS-certified solar, battery, heat-pump and EV installer covering Hull, East Yorkshire, North Yorkshire and Lincolnshire, backed by a 10-year workmanship warranty. For a battery sized and quoted to your home and tariff, request a free quote and we'll recommend the right system from the options above.
Frequently asked questions
What is the best solar battery in the UK for 2026?
There is no single best battery — the right choice depends on your use-case. The Sigenergy SigenStor leads for true whole-home backup and EV pairing with a ~15-year warranty; the Tesla Powerwall 3 wins on simplicity and high power output; GivEnergy offers the best value and SEG tariff flexibility; and Sunsynk is strongest for outage resilience. The best battery is one sized to your home's electricity use and export tariff.
How much does a solar battery cost in the UK in 2026?
Installed solar batteries typically cost around £700–£950 per usable kWh in 2026. A 10–13.5 kWh home battery therefore lands in the low-to-mid thousands depending on the system, install complexity and whether it's fitted alongside new solar. Because batteries qualify for 0% VAT on supply-and-install until 31 March 2027 (HMRC VAT Notice 708/6), now is a cost-effective time to fit one.
Do solar batteries qualify for 0% VAT in the UK?
Yes. Solar battery storage qualifies for 0% VAT when supplied and installed for a UK home, including standalone batteries added without new solar since 1 February 2024. This relief runs until 31 March 2027, after which it reverts to 5% on 1 April 2027 under HMRC VAT Notice 708/6. Note many sources wrongly quote 31 January 2027 — the correct deadline is 31 March 2027.
Can I get paid for exporting battery power to the grid?
Yes, through the Smart Export Guarantee (SEG). Any energy supplier with 150,000+ customers must offer an export tariff (Ofgem), with rates from roughly 1p to 27p/kWh. In 2026 Octopus Outgoing Fixed pays around 15p flat, while time-of-use tariffs like Intelligent Octopus Flux can pay up to ~27p at peak. You need an MCS certificate and a smart meter with half-hourly readings to qualify.
What size solar battery do I need for my home?
Most UK homes are well served by a 5–13.5 kWh usable battery, sized to your daily electricity use and how much solar you generate. A typical 4kW system produces around 3,400–3,650 kWh a year in Yorkshire, covering 60–75% of a home's electricity. Stackable systems like Fox ESS, Solax and Sunsynk let you start smaller and add capacity later as your needs grow.
Are solar batteries eligible for the Boiler Upgrade Scheme grant?
No. The Boiler Upgrade Scheme (BUS) provides a £7,500 grant for air source and ground source heat pumps in England and Wales, not batteries. It requires a valid EPC and replacement of a fossil-fuel heating system, with an MCS-certified installer applying on your behalf. Solar batteries instead benefit from 0% VAT until 31 March 2027 and export earnings via the SEG.
Last updated June 2026 · YEERS — MCS-certified renewable installers, Hull & Yorkshire.
