Wiltshire
Solar panels in Devizes, sized to your roof.
About 6,520 kWh a year from 12 panels in Devizes, £6,360 installed, with your system designed on a free 30-minute video call.
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- Free 30-minute video design call
- Priced before anyone visits
- Installed by our MCS-certified, fully insured teams
Devizes' solar year
From 35.6 kWh per kWp in December to 125.5 in July: a roof in Devizes makes 3.5 times as much in its best month as in its darkest, and 1,025 kWh per kWp across the year.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 39.4 |
| February | 52.9 |
| March | 89.6 |
| April | 116 |
| May | 125 |
| June | 123 |
| July | 126 |
| August | 111 |
| September | 96.2 |
| October | 65.5 |
| November | 45.6 |
| December | 35.6 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
Against Great Britain as a whole: Devizes makes 1,025 kWh per kWp a year, and the mean of our 85 county PVGIS estimates (our GB average) is 925, so Devizes is 11% above it.
How Devizes compares
Small towns rarely get published solar figures, so here are the numbers for Devizes. It is one of 20 Wiltshire towns we track, and it ranks joint 8th of 20 for solar yield, a town of 19,923 people in the House of Commons Library settlement data. PVGIS gives its roofs 1,025 kWh per kWp a year, 2.81 peak sun hours a day averaged across the seasons, and the standard 12 panel model turns that into £917 of year one benefit, £247 of it from your own generation and £670 from export at 12p.
These are starting numbers, not a quote. The calculator below opens on Devizes' own PVGIS figure; change the panels, the battery or the export rate and it reruns. The design call replaces every assumption with your roof and your bills.
Wiltshire is the planning authority covering Devizes, which the House of Commons Library classes as a small town.
The charger is in the installed price but left out of payback: charging savings depend on your mileage and tariff, which the design call models properly.
Your real roof and usage, worked through on a free 30-minute video call. Use the full form or leave three details below.
Price this for your roof
Three details. We call or text within one working day to book your free 30-minute design call, on video or by phone if you prefer.
The figures use PVGIS for the centre of Devizes (51.35196, -1.98559), a 26.32p/kWh import price and £1,000 per kWp installed; see the help page for the full method.
Who runs the grid in Devizes
Devizes sits in Scottish and Southern Electricity Networks' Southern England licence area, so SSEN is the network operator (DNO) any solar panels or battery here are registered with.
G98 is the simple route. If the inverter, plus any battery, stays at or under 3.68kW per phase, SSEN only has to be told within 28 days after the system is commissioned.
Anything bigger is a G99 case and is applied for first. SSEN says it can take up to 45 working days to issue a quotation for a generation connection above 3.68kW per phase and up to 50kW.
Sources: NESO DNO licence areas (3 May 2024); SSEN, micro-generation connections page, checked 25 September 2026. G98 vs G99, explained.
Adding a heat pump or an EV charger in Devizes
A heat pump in Devizes
A heat pump does most of its work from November to February. Over those four months, 12 panels in Devizes make about 1,100 kWh, against 3,080 kWh from May to August, so winter heating runs mostly on grid electricity and the tariff matters more than the roof.
The Boiler Upgrade Scheme, open in England and Wales, takes £7,500 off an air source or ground source heat pump, or £2,500 off an air-to-air unit. Homes on oil or LPG with no mains gas get £1,500 more until March 2027 (gov.uk, checked 28 September 2026).
Charging an EV in Devizes
A 12-panel roof in Devizes makes about 800 kWh in July. A typical home uses around 70 kWh of that in daylight (the calculator's typical-use settings), which leaves most of the month's output for an EV or for export.
Renters and flat owners with private off-street parking can get 75% off a chargepoint and its installation, up to £500 per socket, until 31 March 2027 (gov.uk, checked 28 September 2026). The calculator above adds a 7.4kW smart charger from £1,100 installed.
The packages, priced before anyone visits
Every system is designed around your roof on the free call before anything is fitted.
Solar panel servicing and repair in Devizes
Faults, servicing and ageing inverters follow the same economics in Devizes as anywhere else, and the guides below price them plainly.
Devizes solar questions
What does a solar panel system produce in Devizes?
Each kWp of panels in Devizes makes 1,025 kWh a year on PVGIS figures, so a typical 12-panel system produces around 6,520 kWh, from about 230 kWh in December up to 800 kWh in July.
What would 12 solar panels cost in Devizes?
£6,360 for 12 panels (6.36 kWp), the same as in every other place we cover, because solar is priced at £1,000 per kWp installed rather than by area. A battery adds its own installed price on top. Where Devizes differs is output: about 6,520 kWh a year from that system.
Would a system in Devizes need approval from the network operator?
Devizes is on Scottish and Southern Electricity Networks' network (Southern England licence area). Systems up to 3.68kW per phase of inverter output follow G98: SSEN is notified within 28 days of commissioning, with no approval needed first. Anything larger needs a G99 application before installation. SSEN says it can take up to 45 working days to issue a quotation for a generation connection above 3.68kW per phase and up to 50kW. Our G98 vs G99 guide explains both routes.
How much would export pay on a system in Devizes?
It is exported. With typical use and no battery, about 5,582 kWh of the 6,520 kWh a 12-panel system makes in Devizes goes to the grid, around £670 a year at 12p. A battery keeps more of it for the evening; the export rates table shows what suppliers pay.
Is solar worth it in Devizes in winter?
It works, but the year is lopsided. 68% of a Devizes roof's output lands between April and September; the four months from November to February give about 1,100 kWh on a 12-panel system. Payback is worked out on the whole year, not the winter.
How Devizes compares with its neighbours
The six closest towns we publish, run through the identical PVGIS query as Devizes.
| Town | kWh per kWp a year | vs Devizes |
|---|---|---|
| Devizes | 1,025 | this town |
| Calne | 1,013 | −12 kWh |
| Melksham | 1,031 | +6 kWh |
| Chippenham | 1,009 | −16 kWh |
| Trowbridge | 1,022 | −3 kWh |
| Corsham | 1,025 | level |
| Westbury | 1,029 | +4 kWh |
PVGIS v5.2 for each town centroid, identical assumptions throughout. A few kWh either way is weather-year noise; a spread beyond about 30 kWh per kWp is real geography.
Also for Devizes: Solar panels in Devizes from OVO Solar & Battery
See a number before you speak to anyone
Answer a few questions about your roof and usage and see an instant solar and battery estimate. No email needed to see the result.
Guides worth reading before your call
Sourced, dated and written by us. The same ground we cover on your free call.
How do solar panels work? The full explanation, from photon to plug socket
Light into silicon, DC into AC, AC into your bill. The whole chain, explained.
Read the guide →Inside a home battery: capacity, power and losses
Usable capacity, kW output, round trip losses and chemistry, in plain terms.
Read the guide →The main home EV chargers, compared on what actually differs
Eight popular UK home chargers on cable, connectivity, warranty and tariff integration.
Read the guide →Are heat pumps noisy? The 37 dB(A) answer, in plain terms
The 1 metre boundary rule is gone. A 37 dB(A) sound test replaced it.
Read the guide →What the Smart Export Guarantee actually is
The scheme obliges suppliers to pay above zero, and leaves the rate to them.
Read the guide →What MCS certification actually is, and why your export payments depend on it
The badge that decides whether your solar earns export payments. It cannot be added later.
Read the guide →Get my free quote
Takes about two minutes. We call or text within one working day to book your free 30-minute video design call at a time that suits you. We design it around your roof and your numbers, and our MCS-certified, fully insured installation teams install it.