Middlesex
Solar panels in Stanwell, with the numbers shown.
Twelve panels (6.36 kWp) here make about 6,530 kWh a year for £6,360 installed, designed around your roof on a free 30-minute video call.
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Stanwell's solar year
From 36.4 kWh per kWp in December to 126.1 in July: a roof in Stanwell makes 3.5 times as much in its best month as in its darkest, and 1,026 kWh per kWp across the year.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 39.9 |
| February | 53 |
| March | 87.8 |
| April | 114 |
| May | 123 |
| June | 123 |
| July | 126 |
| August | 112 |
| September | 96.5 |
| October | 67.6 |
| November | 46.7 |
| December | 36.4 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
Our GB average is 925 kWh per kWp a year, the mean of the 85 county PVGIS estimates we publish; at 1,026, Stanwell is 11% above it.
How Stanwell compares
Small towns rarely get published solar figures, so here are the numbers for Stanwell. It is one of 23 Middlesex towns we track, and it ranks joint 5th of 23 for solar yield, a town of 12,629 people in the House of Commons Library settlement data. PVGIS gives its roofs 1,026 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 £918 of year one benefit, £247 of it from your own generation and £671 from export at 12p.
These are starting numbers, not a quote. The calculator below opens on Stanwell's 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.
Spelthorne is the planning authority covering Stanwell, 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.
Modelled for Stanwell at 51.45331, -0.47404 on PVGIS data, with imports valued at 26.32p/kWh and solar at £1,000 per kWp installed. Sources and assumptions: help page.
Who runs the grid in Stanwell
Scottish and Southern Electricity Networks (SSEN) owns and runs the local electricity network in Stanwell, as part of its Southern England licence area.
For a typical home the paperwork is light: a system of up to 3.68kW per phase goes through G98, which means SSEN is notified within 28 days of switch-on rather than asked beforehand.
A bigger inverter or battery output needs a G99 application in advance. 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 Stanwell
A heat pump in Stanwell
A heat pump does most of its work from November to February. Over those four months, 12 panels in Stanwell make about 1,120 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.
Grant support in England comes from the Boiler Upgrade Scheme: £7,500 for an air source or ground source heat pump, £2,500 for air-to-air, and an extra £1,500 until March 2027 where the home is heated by oil or LPG off the gas grid (gov.uk, checked 28 September 2026).
Charging an EV in Stanwell
From April to September, 68% of a Stanwell roof's yearly output arrives, peaking at about 800 kWh in July on 12 panels. A car parked at home in daylight can soak up what the house, at around 70 kWh of daytime use that month, cannot.
The calculator above includes a 7.4kW smart charger from £1,100 installed. Renters and flat owners with off-street parking can claim 75% of a chargepoint's cost, up to £500 per socket, until 31 March 2027 (gov.uk, checked 28 September 2026).
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 Stanwell
Faults, servicing and ageing inverters follow the same economics in Stanwell as anywhere else, and the guides below price them plainly.
Stanwell solar questions
What does a solar panel system produce in Stanwell?
Each kWp of panels in Stanwell makes 1,026 kWh a year on PVGIS figures, so a typical 12-panel system produces around 6,530 kWh, from about 230 kWh in December up to 800 kWh in July.
What would 12 solar panels cost in Stanwell?
£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 Stanwell differs is output: about 6,530 kWh a year from that system.
Would a system in Stanwell need approval from the network operator?
Stanwell 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 Stanwell?
It is exported. With typical use and no battery, about 5,589 kWh of the 6,530 kWh a 12-panel system makes in Stanwell goes to the grid, around £671 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 Stanwell in winter?
It works, but the year is lopsided. 68% of a Stanwell roof's output lands between April and September; the four months from November to February give about 1,120 kWh on a 12-panel system. Payback is worked out on the whole year, not the winter.
How Stanwell compares with its neighbours
How the towns nearest Stanwell compare on the same PVGIS settings, closest first.
| Town | kWh per kWp a year | vs Stanwell |
|---|---|---|
| Stanwell | 1,026 | this town |
| Ashford (Spelthorne) | 1,024 | −2 kWh |
| Staines-upon-Thames | 1,024 | −2 kWh |
| Ashford Common | 1,024 | −2 kWh |
| Sunbury-on-Thames | 1,024 | −2 kWh |
| Egham | 1,024 | −2 kWh |
| Old Windsor and Wraysbury | 1,024 | −2 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 Stanwell: Solar panels in Stanwell from OVO Solar & Battery
Also near Stanwell
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.
Reading for Stanwell homeowners
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 →Does a standalone battery actually pay back?
No panels means one job: buy cheap, use later. The tariff decides whether it pays.
Read the guide →What it really costs to charge an EV at home versus in public
Home off-peak charging costs a fraction of the public price. The arithmetic, and the tariff it depends on.
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 →G98 or G99: which one applies, what the application involves, and how long it takes
The G98 line sits at 3.68kW per phase. Above it, your network operator has to say yes first.
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.