Middlesex
Solar panels in Sunbury-on-Thames, priced before anyone visits.
Twelve panels (6.36 kWp) here make about 6,510 kWh a year for £6,360 installed, designed around your roof on a free 30-minute video call.
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Sunlight in Sunbury-on-Thames, in numbers
From 36 kWh per kWp in December to 126.2 in July: a roof in Sunbury-on-Thames makes 3.5 times as much in its best month as in its darkest, and 1,024 kWh per kWp across the year.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 39.8 |
| February | 52.4 |
| March | 87.1 |
| April | 114 |
| May | 123 |
| June | 124 |
| July | 126 |
| August | 112 |
| September | 96.2 |
| October | 67.6 |
| November | 46.4 |
| December | 36 |
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: Sunbury-on-Thames makes 1,024 kWh per kWp a year, and the mean of our 85 county PVGIS estimates (our GB average) is 925, so Sunbury-on-Thames is 11% above it.
How Sunbury-on-Thames compares
Small towns rarely get published solar figures, so here are the numbers for Sunbury-on-Thames. It is one of 23 Middlesex towns we track, and it ranks joint 15th of 23 for solar yield, a town of 22,155 people in the House of Commons Library settlement data. PVGIS gives its roofs 1,024 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 £916 of year one benefit, £247 of it from your own generation and £669 from export at 12p.
Treat these as calibration rather than a quote. The calculator below runs the same model, opened on Sunbury-on-Thames' 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.
Planning applications here go through Spelthorne; nationally, the House of Commons Library classes Sunbury-on-Thames 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 Sunbury-on-Thames (51.41397, -0.41459), a 26.32p/kWh import price and £1,000 per kWp installed; see the help page for the full method.
SSEN and your Sunbury-on-Thames connection
Scottish and Southern Electricity Networks (SSEN) owns and runs the local electricity network in Sunbury-on-Thames, 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.
Larger systems go through G99 instead, applied for before installation. On timing: 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 Sunbury-on-Thames
A heat pump in Sunbury-on-Thames
In December, the darkest month here, 12 panels in Sunbury-on-Thames make about 230 kWh. That is when a heat pump runs hardest, so its running cost in Sunbury-on-Thames comes down to the tariff and the flow temperature rather 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 Sunbury-on-Thames
Summer is where a car earns its place. In July, 12 panels in Sunbury-on-Thames make about 800 kWh, against roughly 70 kWh a typical home uses in daylight that month on our calculator's typical-use settings, so there is surplus a smart charger can put into the car instead of exporting it.
If you rent, or own a flat, and have private off-street parking, the government chargepoint grant covers 75% of the cost, capped at £500 a socket, until 31 March 2027 (gov.uk, checked 28 September 2026). The calculator above prices 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 Sunbury-on-Thames
If a system in Sunbury-on-Thames is underperforming, start with the guides below: repair benchmarks, service scope, and the inverter question.
Solar in Sunbury-on-Thames: your questions answered
How much energy would 12 solar panels make in Sunbury-on-Thames?
Sunbury-on-Thames averages 2.81 peak sun hours a day, which PVGIS turns into 1,024 kWh per kWp a year. On a 12-panel, 6.36 kWp roof that is about 6,510 kWh, 68% of it between April and September.
What does a typical solar system cost in Sunbury-on-Thames?
Solar is priced at £1,000 per kWp installed wherever you live, so a 12-panel, 6.36 kWp system costs £6,360 in Sunbury-on-Thames, exactly as it would anywhere else, before any battery. Location changes what the system makes, not what it costs: here that is about 6,510 kWh a year. The final figure comes from your roof on the design call.
Who is the network operator in Sunbury-on-Thames, and do I need a G99 application?
The operator is Scottish and Southern Electricity Networks (SSEN). Most home systems use the G98 route, a notification within 28 days of switch-on for up to 3.68kW per phase, so nothing waits on the network. Above that, G99 applies and has to be granted 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. Your design call checks which route yours needs.
What happens to the solar I do not use in Sunbury-on-Thames?
Around £669 a year at 12p per kWh, for the roughly 5,576 kWh a 12-panel system in Sunbury-on-Thames exports with typical use. Rates vary by supplier and some need their own tariff; the export rates table is dated and sourced.
How does solar perform in Sunbury-on-Thames in the winter months?
December is the weakest month in Sunbury-on-Thames: about 230 kWh from 12 panels, against 800 kWh in July. The panels still generate on bright winter days; they just cover a smaller share of what the house uses.
How Sunbury-on-Thames compares with its neighbours
The six closest towns we publish, run through the identical PVGIS query as Sunbury-on-Thames.
| Town | kWh per kWp a year | vs Sunbury-on-Thames |
|---|---|---|
| Sunbury-on-Thames | 1,024 | this town |
| Ashford Common | 1,024 | level |
| Walton-on-Thames | 1,025 | +1 kWh |
| Ashford (Spelthorne) | 1,024 | level |
| Weybridge | 1,025 | +1 kWh |
| Hersham | 1,025 | +1 kWh |
| West Molesey | 1,019 | −5 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 Sunbury-on-Thames: Solar panels in Sunbury-on-Thames from OVO Solar & Battery
Also near Sunbury-on-Thames
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Guides worth reading before your call
Sourced, dated and written by us. The same ground we cover on your free call.
What the January price cap means for solar, and what it does not
The whole-bill forecast is gas-led. What solar actually competes with is smaller, and mostly unpublished.
Read the guide →Which battery size band does your home fall into?
Where UK homes actually land, why oversizing costs you, and what shifts the band.
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 →How much does a heat pump cost? The 2026 numbers, before and after the grant
UK median installed cost around £12,908, before the up to £7,500 grant comes off.
Read the guide →Why the best export rates always carry conditions
The top export rates are acquisition offers. Here is how to price the condition.
Read the guide →Your MCS certificate: what it shows, when it arrives, and how a Smart Export Guarantee supplier uses it
The document your export payments hang on. Who issues it, what it shows, and how to get a copy.
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.