Berkshire
Solar panels in Windsor, with the numbers shown.
A 12-panel roof in Windsor makes about 6,490 kWh a year and costs £6,360 installed; a free 30-minute video call sizes it to yours.
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What a roof in Windsor can generate
PVGIS puts Windsor at 1,021 kWh per kWp a year, level with our Berkshire county estimate. 68% of it arrives between April and September, peaking in July.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 40.2 |
| February | 52.8 |
| March | 87 |
| April | 113 |
| May | 122 |
| June | 123 |
| July | 125 |
| August | 112 |
| September | 95.9 |
| October | 66.9 |
| November | 46.6 |
| December | 36.6 |
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: Windsor makes 1,021 kWh per kWp a year, and the mean of our 85 county PVGIS estimates (our GB average) is 925, so Windsor is 10% above it.
How Windsor compares
Among the places we publish figures for, Windsor is one of 20 Berkshire towns we track, and it ranks joint 11th of 20 for solar yield. It is a medium town in the House of Commons Library classification, with 32,070 residents, and its roofs see 2.80 peak sun hours a day across the year. That drives the standard 12 panel model to 6,494 kWh of generation, of which around 5,557 kWh is exported at 12p for £667 a year, with £247 saved on electricity you would otherwise buy at 26.32p.
Treat these as calibration rather than a quote. The calculator below runs the same model, opened on Windsor's own yield, and prices a 12 panel system at £6,360 installed before any battery. Your free design call reworks every number for your actual roof, its shading and your usage.
Windsor sits within Windsor and Maidenhead, its local planning authority, and the House of Commons Library classes it as a medium 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 Windsor at 51.47677, -0.6322 on PVGIS data, with imports valued at 26.32p/kWh and solar at £1,000 per kWp installed. Sources and assumptions: help page.
Connecting solar to the Windsor network
On NESO's licence-area map, Windsor is in Southern England, which Scottish and Southern Electricity Networks (SSEN) operates. That makes SSEN the network operator for any system fitted here.
Most home systems stay within 3.68kW per phase of inverter output, which puts them on G98, a notification to SSEN within 28 days of switch-on. Panel count does not decide it; the inverter and any battery do.
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.
Heat pumps and EV charging in Windsor
A heat pump in Windsor
Solar and a heat pump pull in opposite directions through the year: Windsor's roofs make 1,120 kWh from November to February on a 12-panel system, and 3,070 kWh from May to August. The heating season leans on the grid, so off-peak rates do the heavy lifting.
In England, the Boiler Upgrade Scheme pays £7,500 towards an air source or ground source heat pump and £2,500 towards an air-to-air one, with £1,500 more until March 2027 for homes heated by oil or LPG with no mains gas (gov.uk, checked 28 September 2026).
Charging an EV in Windsor
From April to September, 68% of a Windsor 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.
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.
What the named kit costs, installed
Every system is designed around your roof on the free call before anything is fitted.
Solar panel servicing and repair in Windsor
Guidance is nationwide, so the benchmarks hold in Windsor: repair costs, service scope, and when the inverter is the real fault.
Solar in Windsor: your questions answered
What could a roof in Windsor generate?
PVGIS puts a roof in Windsor at 1,021 kWh per kWp a year, 2.80 peak sun hours a day averaged across the seasons. A 12-panel, 6.36 kWp system makes about 6,490 kWh a year, most of it between April and September.
How much are solar panels in Windsor?
The price does not move by postcode. At £1,000 per kWp installed, 12 panels (6.36 kWp) come to £6,360 in Windsor before a battery. What Windsor changes is the return, about 6,490 kWh a year from that system, and your design call prices your actual roof.
Do I need permission from the DNO for solar in Windsor?
Usually not in advance. SSEN, the network operator for Windsor, only needs a G98 notification within 28 days of commissioning for systems up to 3.68kW per phase. Bigger inverter or battery outputs need G99 approval 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. "See our DNO explainer.
How much can I earn from exporting solar in Windsor?
With typical use and no battery, a 12-panel system in Windsor exports about 5,557 kWh a year. At 12p per kWh that is roughly £667; a supplier paying more, or a battery that keeps more for the evening, changes the figure. See the export rates table.
Do solar panels work in winter in Windsor?
Yes, at a lower level. PVGIS gives Windsor 36.6 kWh per kWp in December and 40.2 in January, so a 12-panel system makes about 230 kWh and 260 kWh in those months, against 800 kWh in July. Winter output mostly covers daytime use rather than exporting.
How Windsor compares with its neighbours
Same satellite dataset, same assumptions, so the differences are real geography rather than modelling noise.
| Town | kWh per kWp a year | vs Windsor |
|---|---|---|
| Windsor | 1,021 | this town |
| Old Windsor and Wraysbury | 1,024 | +3 kWh |
| Slough | 1,028 | +7 kWh |
| Egham | 1,024 | +3 kWh |
| North Ascot | 1,020 | −1 kWh |
| Maidenhead | 1,027 | +6 kWh |
| Ascot and Sunningdale | 1,023 | +2 kWh |
Same PVGIS v5.2 query for every town. Small differences are within year-to-year weather; more than about 30 kWh per kWp apart is geography.
Also for Windsor: Solar panels in Windsor from OVO Solar & Battery
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Further reading for Windsor
Sourced, dated and written by us. The same ground we cover on your free call.
How to clean solar panels, and whether you need to at all
Cleaning is oversold and pigeon mesh is undersold. The numbers behind both.
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 →Three phase and EV charging: what actually changes
Three phase buys 22kW charging. Most cars cannot use it, and load balancing usually solves the real problem.
Read the guide →The Boiler Upgrade Scheme, explained
A fixed amount, claimed on your behalf by our installation teams, with a real deadline on the £9,000 version.
Read the guide →Will energy prices keep rising, and by how much
The January forecasts jumped fast. What is confirmed, what is guessed, and whether solar is a real hedge.
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.