- Solar alone: about £6,000–£8,000 for a typical 4kW system. Across 2025/26 installs registered with MCS, homes paid an average of £1,955 per kW for systems up to 4kW (DESNZ).
- Adding a battery: roughly £2,500–£8,000 more, depending on size. That puts most solar-plus-battery packages at £9,000–£15,000.
- 0% VAT applies to solar panels and batteries until 31 March 2027. After that it rises to 5%.
- Payback is slower than many adverts suggest: about 11–15 years at today's prices. A battery pays off best when you use a lot of power at home or switch to a time-of-use tariff.
- Grant-funded solar exists but it is narrow. It's mainly through ECO4 (to 31 December 2026) and the Warm Homes: Local Grant for eligible low-income homes. Check in 60 seconds.
Solar quotes are confusing because every installer bundles them differently. One gives you a single price, another splits panels, inverter, battery and scaffolding, and a third leads with a monthly finance figure. This guide strips that back to three numbers you can check: what the panels should cost, what the battery adds, and how long the combination takes to pay for itself.
All prices below are for a standard installation on a pitched roof by an MCS-certified installer, including VAT at the current 0% rate. If you only want panel prices, our solar panel costs guide goes deeper on system size and roof type. If you are still deciding whether storage makes sense at all, start with our battery storage explainer.
Solar panel and battery prices by system size (2026)
The most reliable price benchmark in the UK is the government's own. Every year the Department for Energy Security and Net Zero (DESNZ) publishes the cost of installations registered with MCS. The latest release covers 265,682 installations between April 2025 and March 2026, a record. It shows homes paid an average of £1,955 per kW for systems up to 4kW and £1,645 per kW for 4–10kW systems (DESNZ solar PV cost data, May 2026). Those figures exclude batteries, so we've added typical battery prices on top.
| System | Panels | Suits | Solar only | + 5kWh battery | + 10kWh battery |
|---|---|---|---|---|---|
| 3kW | 7–9 | Flat, small terrace, low use | £5,000–£6,500 | £7,500–£11,000 | £9,500–£13,500 |
| 4kW | 9–11 | Typical 3-bed home | £6,000–£8,000 | £8,500–£12,500 | £10,500–£15,000 |
| 5kW | 11–13 | Larger family home | £7,000–£9,500 | £9,500–£14,000 | £11,500–£16,500 |
| 6kW | 14–16 | High use, EV or heat pump | £8,000–£11,000 | £10,500–£15,500 | £12,500–£18,000 |
Indicative installed prices, 0% VAT. Solar-only bands are consistent with DESNZ/MCS 2025/26 averages; battery columns add the battery ranges below. Panel counts assume modern 430–450W panels. Scaffolding, roof complexity and region move quotes up or down.
The Energy Saving Trust's benchmark lands in the same place. It says a typical home system is around 4.5kWp and costs around £7,600 (Energy Saving Trust).
The direction of travel matters if you are weighing “now or later”. Prices spiked in 2022/23 and have been falling since. In real terms, median costs for small systems fell 9% in a year, to the lowest level DESNZ has recorded. Waiting for a big further drop is a weak reason to delay, especially with the 0% VAT window closing in March 2027.
What a battery adds to the bill
A battery is the single biggest swing factor in a solar quote. The Energy Saving Trust puts battery storage at around £5,000 to £8,000 (Energy Saving Trust). In practice the price depends on three things: capacity, whether you need a new inverter, and whether it's fitted at the same time as the panels.
| Battery size | Typical extra cost* | Good for |
|---|---|---|
| 5kWh | £2,500–£4,500 | Covering the evening peak in a 2–3 bed home |
| 10kWh | £4,500–£7,000 | Most of an evening and overnight for a family home, or cheap-rate charging |
| 13.5kWh+ (e.g. Tesla Powerwall 3) | about £7,500–£10,500 | High users, EV owners, whole-home backup |
| Retrofit to existing solar | add £500–£1,500 | Extra labour and often a hybrid or AC-coupled inverter |
*Indicative 2026 ranges when installed alongside new panels, including installation and 0% VAT. A hybrid inverter can serve panels and battery together, which is why fitting both at once is usually cheaper.
Two things inflate battery quotes that you can push back on. The first is oversizing. A battery that never fills in winter and never empties in summer is wasted money. As a rule of thumb, size it to your evening and overnight use, typically 40–60% of your daily consumption. The second is a second inverter you don't need: if you're buying panels and battery together, ask for a hybrid inverter.
Battery brands compared
You don't need a famous brand, but you do need a warranty that will still be honoured in ten years. That became very real in 2026, when GivEnergy Ltd entered administration on 9 April 2026, leaving owners relying on their installer for hardware warranty support (Energy Storage Association). It is the strongest argument for buying from an installer that offers its own workmanship and product cover, and for paying with a credit card or regulated finance.
| Brand / range | Type | Typical capacity | Worth knowing |
|---|---|---|---|
| Tesla Powerwall 3 | All-in-one, built-in solar inverter | 13.5kWh per unit | Premium price, high power output, whole-home backup with the Gateway |
| Sigenergy SigenStor | Modular, hybrid inverter stack | Stackable modules | Popular with installers in 2026; add modules later |
| Fox ESS | Modular, hybrid or AC-coupled | Stackable modules | Usually among the cheaper per kWh |
| Huawei LUNA2000 | Modular, pairs with Huawei inverters | 5kWh modules | Best value when you also use a Huawei inverter |
| SolarEdge Home Battery | Pairs with SolarEdge systems | Single or stacked units | Makes sense if your panels already use SolarEdge optimisers |
| Enphase IQ Battery 5P | AC-coupled, for microinverter systems | 5kWh units | Good for retrofits to Enphase systems; higher cost per kWh |
We don't take payment from manufacturers. Specifications change; check the current datasheet and the warranty terms (years and retained capacity) on your quote.
Whatever the badge, compare quotes on cost per usable kWh, the warranty length and end-of-warranty capacity (70–80% after 10 years is typical), and who honours the warranty if the manufacturer disappears.
Paying for solar yourself?
Get one MCS-certified installer who covers your postcode to price your roof, with or without a battery. There's no obligation, and you can take the numbers on this page into the conversation.
Solar and battery cost and payback calculator
This estimator uses the price bands above, the October–December 2026 price cap and a cautious model of how much solar electricity you use yourself. Change the inputs to match your home. It runs entirely in your browser and stores nothing.
Estimate your system
Typical 2026 prices, flat energy prices, south-ish facing roof. A guide only, not a quote.
You'd use about 2,190 kWh of your own solar a year (worth £577) and export about 1,210 kWh (£145).
Assumptions: annual yield of 800–950 kWh per kW by region; without a battery you use up to about 38% of your consumption from solar; a battery cycles usefully on about 225 days a year at 90% efficiency; smart-tariff charging assumes 120 winter days at 7.5p/kWh. Default import price is the Ofgem cap average for 1 October–31 December 2026 (26.32p/kWh). Real savings depend on your roof, habits and tariff.
Export rates: what the Smart Export Guarantee pays in 2026
Whatever you don't use goes to the grid, and you should be paid for it. Under the Smart Export Guarantee (SEG), larger electricity suppliers must offer an export tariff to homes with an eligible, certified installation. They set their own rate, and it must always be above zero (Ofgem). You'll need an export-capable smart meter and your MCS certificate.
| Tariff (October 2026) | Rate | Catch |
|---|---|---|
| Outgoing Octopus | 12p/kWh flat | Octopus import customers |
| Prime Outgoing Octopus | 16p (4–7pm), 9p other times | Rewards evening export; best with a battery |
| E.ON Next Export Exclusive | 13p/kWh | E.ON Next import customers |
| British Gas Export Premium | 12p/kWh | British Gas import customers |
| Battery-linked smart tariffs | Varies, can exceed 20p at peak | Usually need a compatible battery and the supplier's import tariff |
Rates checked 2 October 2026 via Octopus Energy and Sunsave’s SEG comparison. Export rates change often, and Outgoing Octopus itself fell from 15p to 12p in March 2026.
Here's the key point for battery buyers: exporting earns you 12–16p, while every unit you use yourself saves you 26.32p at the current price cap (Ofgem price cap, Oct–Dec 2026). A battery's job is to turn cheap exports into expensive avoided imports, roughly a 14p gain on every unit it shifts. That is the whole economic case in one sentence.
Worked example: a 3-bed semi in Leeds
4kW on a south-east roof, 3,100 kWh a year
Sarah and Tom live in a 1930s three-bed semi in Leeds. They use 3,100 kWh of electricity a year, a little above Ofgem's 2,700 kWh “medium” household, and both work partly from home. A 4kW system in West Yorkshire generates about 3,400 kWh a year.
The battery adds about £145 a year on its own, which is a slow return on £3,500. Paired with a time-of-use tariff, it does better. Sarah and Tom's case gets much stronger if they buy an EV or a heat pump: higher daytime and evening demand is exactly what makes a battery earn its keep.
Is adding a battery worth it?
Honestly, it depends on how you use electricity. Here's how to tell.
- You're out during the day and home in the evening. Without storage you export most of your solar, then buy power back at night.
- You have, or plan to get, an EV or heat pump. Big electrical loads raise self-consumption and let a battery cycle every day.
- You'll use a time-of-use tariff. Charging cheaply overnight in winter keeps the battery working when the panels aren't producing much.
- You're installing panels anyway. Fitting both together with one hybrid inverter avoids paying for labour and scaffolding twice.
- Low usage and someone is home all day. You already use much of your solar directly, so the battery has little left to shift.
- A small system (under 3kW). There's rarely enough surplus to fill a battery for much of the year.
- You're moving within five years. Batteries add some appeal for buyers, but you probably won't recover the cost.
Grants, 0% VAT and finance
0% VAT. Solar panels and battery storage installed in homes are zero-rated for VAT until 31 March 2027 (HMRC VAT Notice 708/6). After that the rate is due to return to 5%. On a £10,000 package, that's £500 you'd otherwise pay from April 2027. Your installer applies it automatically, so there's nothing to claim.
Funded solar for eligible households. There's no general government grant for solar panels. The Energy Saving Trust says so plainly (Energy Saving Trust). Funded solar is limited to specific schemes:
- ECO4 can include solar PV for households on qualifying benefits, usually as part of a wider package with insulation and heating. ECO4 runs to 31 December 2026, with no ECO5 to follow.
- The Warm Homes: Local Grant in England, to March 2028, can fund solar for eligible low-income homes rated EPC D–G, through participating councils.
- Batteries are rarely funded on their own. See our solar panel grants guide and solar on benefits for the detail.
Nobody is guaranteed funding. It's finite, delivered postcode by postcode, and the assessment decides which measures come first. That's why it's worth checking eligibility before you pay for solar yourself.
Finance. The Warm Homes Plan has promised low and zero-interest loans for homeowners, with details still to come. If you use installer finance in the meantime, compare the total amount repayable, not the monthly figure.
Could your solar be funded?
Check your postcode against ECO4, the Warm Homes: Local Grant and council schemes in one go. It's free and there's no obligation.
How to check a solar and battery quote
- Price per kW for the panels. Divide the solar part of the quote by the system size. Much above £2,000/kW for a simple roof deserves a question; the 2025/26 average was £1,955 for systems up to 4kW.
- Battery cost per usable kWh. Compare like with like, using usable capacity rather than “total” capacity.
- Generation estimate. MCS installers must give you a performance estimate. Check it is in the 800–1,000 kWh per kW range for your region and roof.
- Inverter. One hybrid inverter for panels and battery, unless there's a good reason for two.
- Warranties. Panels (product and performance), inverter, battery (years and end capacity), and workmanship, plus insurance-backed cover if the installer stops trading.
- Certification. MCS certification is required for SEG payments. Ask for the certificate number on the quote.
- No pressure. Be wary of “today only” discounts, or anyone asking for a large deposit before survey.
Comparing heat as well as power? See our heat pump cost guide and the ground source heat pump cost guide. Both pair well with solar and storage.