Both halves priced · the sum shown · VAT, grants, loans and export tariffs
Solar Panels and Battery Cost in 2026: both halves, with the arithmetic
The Energy Saving Trust’s £7,600 for the panels and £4,600 for a 5 kWh battery, added up; DESNZ’s cost per kW and cost per kWh multiplied out for the sizes people actually buy; Octopus’s own published package as a named comparison; what a combined quote contains and why one visit costs less than two. We do not publish a price list: the number for your roof and your usage comes from a survey.
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Solar panels and battery cost is a question with two halves, and most pages answer it with one range and no source. This page prices each half from the official figures, dated, and then adds them with the multiplication shown. Energy Saving Trust puts a typical system at around 4.5 kWp costing around £7,600 installed, and a 5 kWh battery at around £4,600: about £12,200 for the pair. DESNZ’s statistics for 2025/26 give a second answer built from medians and band averages, and Octopus publishes a package price we can set beside both. None of them is our price.
We do not print an HCE figure anywhere on this site. The real number depends on the roof, how much electricity you use and when, the inverter the design needs and the route the network-operator paperwork takes, and the only honest way to produce it is a survey. What we can do is show how the published answers are built, what a combined quote contains, why one visit costs less than two, how to size the battery without guessing, and what VAT, grants, loans and export tariffs really do in 2026 — so that a quote for a home in and around Guildford, or anywhere across Surrey, can be read against something solid. If you want one half only, our solar panel installation cost and solar battery storage cost pages take each on its own, and battery storage explains what a battery does through the day.
Quick answer
Solar panels and battery cost, in short:
- Energy Saving Trust: a typical 4.5 kWp solar system costs around £7,600 installed (27 August 2026) and a 5 kWh battery around £4,600 (19 August 2026) — £7,600 + £4,600 = about £12,200 for the pair
- DESNZ Solar PV cost data (May 2026): median £1,546 per kW for 4 to 10 kW systems, batteries excluded, so 4.5 kWp × £1,546 = £6,957 for the solar half
- DESNZ battery installation statistics (28 May 2026): mean £1,280 per kWh for 1 to 5.99 kWh, £870 for 6 to 10.99 kWh and £670 for 11 to 29.99 kWh — about £6,570, £8,520 and £10,380 for the average job in each band
- Octopus Energy’s own page prices a 12-panel installation with a 10 kWh smart battery at £11,115 (July 2026 prices); its published battery-only prices start at £3,947 for 5 kWh
- VAT is 0% on residential solar panels and batteries until 31 March 2027, then 5% (HMRC VAT Notice 708/6) — a battery fitted on its own is covered too
- There is no general grant; the Warm Homes: Local Grant funds a battery only alongside solar PV, and the Warm Homes Loan Scheme caps at £15,000 for solar PV plus £15,000 for a battery, lower-interest not zero
- We do not publish an HCE price: the number for your roof and your usage comes from a free survey
Sources: Energy Saving Trust (updated 27 August and 19 August 2026), DESNZ Solar PV cost data (May 2026) and MCS-certified domestic battery installation statistics (28 May 2026), Octopus Energy’s battery-only installation page (read 14 October 2026), PVGIS 5.3, HMRC VAT Notice 708/6 and Ofgem — read 14 October 2026.
The two official figures, added up
Energy Saving Trust’s page Solar panels: costs, savings and benefits explained, updated 27 August 2026, describes the typical domestic system as around 4.5 kWp — around 12 panels over 20 to 30m² of roof — costing around £7,600 installed. The same organisation’s Battery storage advice, updated 19 August 2026, says a home battery can range from £1,500 to £10,000, that a 5 kWh system costs around £4,600, and that a typical home system might be 10 kWh.
Put the two pages side by side and the sum is a single line:
- Typical array plus a 5 kWh battery: £7,600 + £4,600 = £12,200 for a typical 4.5 kWp array with a 5 kWh battery, on the Trust’s two figures
- The same array with the Trust’s 10 kWh example: no single figure exists, because the Trust prices only the 5 kWh system and gives the £1,500 to £10,000 range for the rest — for a larger battery, DESNZ’s band averages in the next section are the nearest official number
Two cautions before you carry that £12,200 anywhere. The two numbers come from two different pages written for two different jobs, so the sum describes a typical array plus a typical small battery, not a system anyone has quoted. And neither page is a price list: each is a national figure that a specific house lands either side of. Read it as the backdrop you hold a quote against — which is how we use it, and why our own number only ever comes from a survey.
What DESNZ’s averages say about a combined job
DESNZ publishes two sets of statistics that, added together, price a combined system — as long as you do the adding yourself and label the result properly. The first is Solar PV cost data (May 2026), which analysed 264,742 installations from the 2025/26 financial year with batteries excluded. The median cost per kW installed was £1,595 for systems of 0 to 4 kW and £1,546 for 4 to 10 kW, and in real terms those medians fell 7% and 9% on the year before. This page needs one line of solar arithmetic: 4.5 kWp × £1,546 = £6,957. Every other size is multiplied out on our solar panel installation cost page.
The second is MCS-certified domestic battery installation statistics (28 May 2026, statistics in development), which covers MCS-registered batteries fitted in existing homes in 2025/26. Its cost figure is equipment plus installation plus VAT where applicable, and it excludes any solar fitted alongside — so it prices the battery as a job of its own. It sorts batteries into three bands:
- 1 to 5.99 kWh: mean £1,280 per kWh (median £1,300), average size 5.14 kWh — 5.14 kWh × £1,280 is about £6,570 for the average job
- 6 to 10.99 kWh: mean £870 per kWh (median £890), average size 9.80 kWh — 9.80 kWh × £870 is about £8,520
- 11 to 29.99 kWh: mean £670 per kWh (median £630), average size 15.48 kWh — 15.48 kWh × £670 is about £10,380
Now add the solar median to the band for the battery size you are considering. These are the costs of two separate average jobs, not a package price, and the Trust says fitting both in one visit costs less than two:
- 4.5 kWp plus a small-band battery (average 5.14 kWh): £6,957 + £6,570 = £13,527, call it £13,500
- 4.5 kWp plus a mid-band battery (average 9.80 kWh): £6,957 + £8,520 = £15,477, call it £15,500
- 4.5 kWp plus a large-band battery (average 15.48 kWh): £6,957 + £10,380 = £17,337, call it £17,300
Why does the DESNZ sum run above the Trust’s £12,200? Partly because DESNZ’s battery figure is a mean across every job in the band, awkward ones included, where the Trust gives one typical figure; and partly because the DESNZ battery job stands alone, with its own visit, electrician’s time, commissioning and paperwork. A combined quote should land below the two-job sum for exactly that reason. The same statistics record MCS-registered battery installs rising from 24,242 in 2024/25 to 44,033 in 2025/26, an 81.6% increase.
A named package price for comparison
Averages are one thing; a price a company actually publishes is another, and one large supplier does publish. Octopus Energy’s battery-only installation page (published 6 June 2025, with prices it states as based on April and July 2026 prices, read 14 October 2026) says its most popular system is a 12-panel installation with a 10 kWh smart battery at £11,115, and that its prices start at £6,663 for a two-panel installation with no battery, based on July 2026 prices. For batteries on their own it lists £3,947 for a smart 5 kWh battery, £5,336 for a smart 10 kWh battery and £7,999 for a 13.5 kWh Tesla Powerwall 3.
Three things to hold those numbers against. First, they are Octopus’s published prices, cited as such: the page does not say whether the battery prices include installation or VAT, so we call them published battery prices, never installed ones. Second, around 12 panels is also the count the Energy Saving Trust attaches to its typical 4.5 kWp system, so the £11,115 package and the Trust’s £12,200 sum describe systems of broadly similar scale, the Octopus one with the larger battery. Third, a two-panel job at £6,663 is the fixed-cost point made in numbers: the scaffold, the inverter, the electrician and the paperwork do not shrink with the array, which is also why DESNZ’s cost per kW falls as systems get bigger.
If you are comparing batteries by name rather than by band, our Tesla Powerwall 3 cost page sets out Tesla’s own UK unit prices and what its warranty asks of the supply chain, our EcoFlow PowerOcean and Sigenergy product pages describe two modular alternatives, and which home battery sets EnSmart, Sigenergy, Tesla and EcoFlow side by side. Whichever unit a design uses, the installed price for your house comes from the survey, not from this page.
What is in a combined quote
A combined quote is a solar quote with a battery section built into it, and the point of itemising it is to see which lines are shared. These are the lines, and why each exists.
- Panels. Make, model, rated output and count. The panels are designed to last 25 to 30 years and are the long-lived part of the system.
- Inverter. A hybrid inverter runs the panels and the battery through one unit, while an AC-coupled battery brings its own inverter and can be added to an array that already exists — which suits your house is a design choice the surveyor should explain, not a price point. Inverters typically carry shorter warranties than panels.
- Battery packs. Make, model, usable capacity in kWh and how many modules make up the total. A modular system is sized in steps, and the quote should say which step it has chosen and why.
- DC and AC protection. Isolators, over-current and surge protection, and the cabling between roof, battery and consumer unit — designed once, for the whole system.
- Mounting. Rails, hooks and flashings for an on-roof array or the tray system for in-roof, plus the wall or floor mounting for the battery.
- Scaffolding. The line that varies most between two houses of the same size, and the clearest saving from a single visit: it is hired once.
- MCS-certified labour. HCE is NAPIT member 73495 and a HIES Consumer Code member (HCE/A/1392), with MCS certification for solar PV via NAPIT; the NAPIT registration covers solar PV and battery storage.
- DNO notification or application. Decided by the inverter rating, not by the array or the battery size. Type-tested generation up to and including 16 A per phase (3.68 kW) is notified to the network operator under G98 before commissioning or no later than 28 days after it; anything above 16 A per phase needs a G99 application approved before the work starts, and network operators aim to answer small fast-track applications within about 10 working days. A 4 kW inverter is 17.39 A, just over the line.
- Commissioning. Testing, inspection and switch-on of panels, inverter and battery together.
- Handover documents. The MCS certificate and the electrical certification, which arrive after the installation is registered, plus manuals and warranty registrations.
- Warranties, separately. Panel product and performance warranties, the inverter warranty, the battery warranty with its capacity and cycle terms (Tesla’s Powerwall 3 warranty, for example, runs ten years with at least 80% of its 13.5 kWh retained at ten years for UK installations), and the installer’s own workmanship guarantee, each with its length written down.
Energy Saving Trust says fitting storage at the same time as panels costs less than a separate visit later. The list shows why: the scaffold, the electrician’s time, the protection design, the network-operator submission, the commissioning and the handover are each paid for once. A battery added in a later year repeats most of that list. Ask any installer, us included, to itemise the quote this way; the exercise is the one in what is in a solar quote, line by line, and it is what makes two combined quotes comparable.
Want a priced, itemised quote for both halves rather than two national averages added together?
A free survey gives you the array size, the battery size and the reason for it, the inverter and its DNO route, the scaffold and the VAT line for your house, itemised so you can hold it against anyone else’s.
Sizing the battery honestly
Energy Saving Trust’s own words on sizing are that there is no exact formula — sizing comes from your own consumption. Any page or quote that hands you a battery size before asking how much electricity you use, and when, has guessed. What exists instead are reference points, and there are three.
The first is how much a home uses. Ofgem’s Typical Domestic Consumption Value from 1 July 2026 is 2,500 kWh a year for a medium, single-rate household — 2,500 ÷ 365 = 6.8 kWh a day, as an average that hides the winter peak. The second is what people actually buy: DESNZ’s 2025/26 statistics put the average battery at 5.14 kWh in the small band, 9.80 kWh in the mid band and 15.48 kWh in the large band, and the Trust says a typical home system might be 10 kWh. A 13.5 kWh Powerwall 3 sits in the large band; a 5 kWh unit holds less than one average day’s use, a 10 kWh unit about a day and a half (10 ÷ 6.8 = 1.5).
The third is what the roof produces. On PVGIS 5.3 (European Commission Joint Research Centre), database PVGIS-SARAH3, 2005–2023, with the parameters 4 kWp, 35° tilt, due south, 14% system losses, building-mounted, a 4 kWp array generates about 3,974 kWh a year in Guildford, 3,984 in Woking, 4,020 in Crawley, 3,978 in Maidenhead, 4,128 in Petersfield and 4,023 in Basingstoke. The spread across the six towns is 154 kWh a year (4,128 − 3,974); east- or west-facing roofs generate less, and shading changes the answer more than the town does.
The timing problem is what the battery is for. Over a year the Guildford roof produces more than the typical household uses — 3,974 kWh against 2,500 — but it produces in daylight, and most of it in summer: the Met Office station at Wisley, about six miles north-east of Guildford, records about 208 hours of sunshine in July and about 47 in December (1991 to 2020). A battery carries the daytime surplus into the evening; it cannot carry July into December. Sizing it for the summer surplus leaves it part-empty in winter, so the evening load is the sensible place to start. Our what size home battery do I need guide works through the method, and how long do solar batteries last covers the other half of the sum: the Trust puts typical lifespan at about 10 to 12 years, which places a battery replacement inside the 25 to 30 years the panels are designed to last.
VAT, grants, loans and tariffs — what is real
Under HMRC’s VAT on energy-saving materials and heating equipment (VAT Notice 708/6), a residential installation of solar panels and battery storage in Great Britain carries 0% VAT until 31 March 2027; after that it is 5% from 1 April 2027, the reduced rate rather than the standard 20%. The relief covers a battery fitted with the panels and a battery fitted on its own, so the VAT line on a combined quote should read 0% against both halves. A home EV chargepoint is not on the energy-saving-materials list, so a charger added to the same job is standard-rated at 20% and should sit on its own line. Our guide to VAT on solar panels and batteries covers the edge cases.
There is no general government grant for household solar or batteries in England. The routes are income-linked. ECO4 runs to 31 December 2026 after a nine-month extension. The Warm Homes: Local Grant covers privately owned homes in England, owner-occupied or privately rented, at EPC D to G, where the household is in a low-income postcode (IMD deciles 1 to 2), receives a means-tested benefit or has a gross household income of £36,000 or less; councils usually make contact within 10 working days of an application. For this page the detail that matters is that the grant funds a battery only alongside solar PV (DESNZ guidance updated 2 July 2026): a battery on its own is not a route to it.
The Warm Homes Loan Scheme (scheme rules September 2026) is the one scheme written for both halves. It is a lender loan, not a grant, capped at £15,000 for solar PV and £15,000 for a battery, with the government paying lenders up to 20% of the loan to bring the interest rate down. Lower-interest, not zero-interest, and the repayments belong in your payback sum.
Export is where a battery changes the paperwork as well as the sum. Under the Smart Export Guarantee, suppliers with 150,000 or more domestic customers must offer an export tariff, and rates are set by each supplier and must be above zero — they change on short notice, which is why we never print one. To be paid at all you need an MCS certificate for the installation and a meter capable of half-hourly export readings. The time-of-use export tariffs that make the most of a battery — Octopus’s Flux-type tariffs, for example — add a condition: Octopus’s eligibility page (read 7 October 2026) asks for a solar system and a home battery, plus a half-hourly smart meter and an MCS document. Those rates move too, so we do not print them either. What matters at quote stage is that the MCS certificate and the meter are in the plan.
Payback, honestly
A battery does not generate anything. It raises the share of the roof’s output you use yourself, so the honest way to think about its payback is as a change in self-use, priced at what you would otherwise pay for electricity: around 26p per kWh — the 26.32p per kWh Ofgem price-cap unit rate for October to December 2026 (Direct Debit).
As an illustration only, with the self-use shares assumed for the arithmetic rather than measured on any system: take the Guildford roof at 3,974 kWh a year. If the house used 40% of that without a battery, that is 3,974 × 0.4 = 1,589.6 kWh, and 1,589.6 × 26.32p = £418.38 a year of electricity not bought. If a battery lifted self-use to 70%, that is 3,974 × 0.7 = 2,781.8 kWh, worth £732.17, and the difference — 1,192.2 kWh, or £313.79 a year — is what the battery earns at those assumed shares. Against that go the battery’s own cost, its about 10 to 12 years lifespan, and the export payment you no longer receive on the units you keep, at a supplier-set rate. The standing charge of 54.83p a day is untouched by either half.
We are not going to turn that into a combined payback year, because the inputs that decide it — your evening load, your tariff, your roof — are the ones no national page knows. What is published is the solar half: Energy Saving Trust’s payback table, with export payments included and fuel prices as of July 2026, has a London home reaching break-even in about 9 years. Put your own figures into our savings calculator, or ask for a survey through our solar panel installation page or contact page, and the self-use share becomes an estimate built on your usage rather than an assumption.
Sources: Energy Saving Trust — Solar panels: costs, savings and benefits explained (updated 27 August 2026) · Energy Saving Trust — Battery storage (updated 19 August 2026) · DESNZ — Solar PV cost data, May 2026 (2025/26 financial year, 264,742 installations, batteries excluded) · DESNZ — MCS-certified domestic battery installation statistics, 28 May 2026 (statistics in development, 2025/26, batteries in existing homes) · Octopus Energy — Introducing battery-only installation with Octopus (published 6 June 2025, April and July 2026 prices, read 14 October 2026) and its export tariff eligibility page (read 7 October 2026) · PVGIS 5.3 (European Commission Joint Research Centre), PVGIS-SARAH3, 2005–2023, 4 kWp, 35° tilt, due south, 14% system losses, building-mounted (Guildford run 12 October 2026, Basingstoke 14 October 2026, Crawley 16 September 2026, Woking and Maidenhead 10 September 2026, Petersfield 8 September 2026) · HMRC — VAT on energy-saving materials and heating equipment (VAT Notice 708/6) · Ofgem — Smart Export Guarantee, the October to December 2026 price cap and the Typical Domestic Consumption Values from 1 July 2026 · GOV.UK — Warm Homes: Local Grant guidance (DESNZ, updated 2 July 2026) and Warm Homes Loan Scheme rules (September 2026) · ENA EREC G98 Issue 2 (10 March 2025) · Met Office — Wisley station averages, 1991 to 2020 · Tesla Powerwall Warranty (European Warranty Region), Rev. 1.16, effective 3 December 2025. All read 14 October 2026 unless stated.
Solar panels and battery cost: your questions
How much do solar panels and a battery cost in the UK in 2026?
Add the two official figures. The Energy Saving Trust (updated 27 August 2026) puts a typical 4.5 kWp solar system at around £7,600 installed, and its battery storage advice (updated 19 August 2026) puts a 5 kWh battery at around £4,600, so the pair comes to about £12,200. DESNZ gives a second view: 4.5 kWp at its £1,546 per kW median is £6,957, and its average small-band battery job (5.14 kWh) is about £6,570, about £13,500 as two separate average jobs. Octopus publishes a 12-panel, 10 kWh package at £11,115 (July 2026 prices). None of these is our price; that comes from a survey of your roof and usage.
How much does a solar battery cost on its own?
The Energy Saving Trust says a battery can range from £1,500 to £10,000, with a 5 kWh system at around £4,600. DESNZ’s battery statistics (28 May 2026, MCS-registered batteries in existing homes, 2025/26) give means of £1,280 per kWh for 1 to 5.99 kWh, £870 for 6 to 10.99 kWh and £670 for 11 to 29.99 kWh: about £6,570, £8,520 and £10,380 for the average job in each band. Octopus’s published battery prices start at £3,947 for 5 kWh and £5,336 for 10 kWh, and its page does not say whether that includes installation or VAT. A battery on its own is zero-rated for VAT until 31 March 2027.
Is it cheaper to fit the battery with the panels?
Yes, according to the Energy Saving Trust, which says fitting storage at the same time as panels costs less than a separate visit later. The reason is what a combined quote shares: one scaffold hire, one electrician’s visit, one protection design for the whole system, one network-operator submission on the final inverter rating, one commissioning and one handover pack. DESNZ’s battery statistics price batteries on their own, with any solar fitted alongside excluded, so adding its solar median to its battery band average gives the cost of two separate jobs; a single-visit quote should come in under that sum. By how much is what the survey finds out.
What size battery do I need?
There is no exact formula, in the Energy Saving Trust’s own words; the size comes from your consumption. Ofgem’s Typical Domestic Consumption Value from 1 July 2026 is 2,500 kWh a year, about 6.8 kWh a day. DESNZ’s 2025/26 statistics put the average battery at 5.14 kWh in the small band, 9.80 kWh in the mid band and 15.48 kWh in the large band; the Trust says a typical home system might be 10 kWh. A 4 kWp south-facing roof in Guildford generates about 3,974 kWh a year on PVGIS, mostly in summer daylight, so the battery’s job is carrying daytime generation into the evening, not storing a winter.
Is VAT charged on a solar and battery system?
Not at present. Under HMRC VAT Notice 708/6, solar panels and battery storage installed in residential accommodation in Great Britain are zero-rated until 31 March 2027, and that applies to a battery fitted with the panels or on its own. From 1 April 2027 the rate reverts to the reduced 5%, not 20%. A home EV chargepoint is not on the energy-saving-materials list, so a charger added to the same job is standard-rated at 20% and belongs on its own line. Ask that any quote states the VAT treatment applied to each line and that it covers supply and installation together, because the relief attaches to the installed work.
Is there a grant for solar panels and a battery?
Not a general one. No government grant for household solar or batteries in England is open to everyone. The routes are income-linked: ECO4, which runs to 31 December 2026, and the Warm Homes: Local Grant for privately owned homes at EPC D to G where the household is in a low-income postcode (IMD deciles 1 to 2), receives a means-tested benefit or has a gross household income of £36,000 or less. Under that grant a battery is funded only alongside solar PV, not on its own. The Warm Homes Loan Scheme (rules September 2026) offers lower-interest lender loans capped at £15,000 for solar PV and £15,000 for a battery.
Want the real number for your roof and your battery?
Request a free, no-obligation survey and you will get the array size, the battery size with the reasoning behind it, the inverter and its DNO route, the scaffold, the handover documents and the VAT line for both halves, itemised so it is comparable with anyone else’s. See also battery storage and residential solar panel installation.
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