Surrey
Solar panels in South Merstham, priced before anyone visits.
Twelve panels (6.36 kWp) here make about 6,540 kWh a year for £6,360 installed, designed around your roof on a free 30-minute video call.
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Sunlight in South Merstham, in numbers
PVGIS puts South Merstham at 1,029 kWh per kWp a year, 1% above our Surrey 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 | 38.1 |
| February | 52.4 |
| March | 88 |
| April | 116 |
| May | 124 |
| June | 125 |
| July | 127 |
| August | 112 |
| September | 96.5 |
| October | 66.5 |
| November | 46.9 |
| December | 36.3 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
For scale: 1,029 kWh per kWp in South Merstham against 925, our GB average (the mean of our 85 county PVGIS estimates), which puts South Merstham 11% above it.
How South Merstham compares
Small towns rarely get published solar figures, so here are the numbers for South Merstham. It is one of 47 Surrey towns we track, and it ranks joint 12th of 47 for solar yield, a town of 9,887 people in the House of Commons Library settlement data. PVGIS gives its roofs 1,029 kWh per kWp a year, 2.82 peak sun hours a day averaged across the seasons, and the standard 12 panel model turns that into £920 of year one benefit, £247 of it from your own generation and £673 from export at 12p.
Every figure here assumes a clear, south-facing roof at 35 degrees. Yours will differ, which is what the free design call is for; until then, the calculator below tests panels, batteries and export rates on South Merstham's own yield.
Planning applications here go through Reigate and Banstead; nationally, the House of Commons Library classes South Merstham 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 South Merstham (51.25888, -0.14738), a 26.32p/kWh import price and £1,000 per kWp installed; see the help page for the full method.
The network operator for South Merstham
South Merstham is served by UK Power Networks: the town's centre falls inside its South East England licence area on NESO's boundary map.
What decides the paperwork is the inverter and battery output, not the number of panels. Up to 3.68kW per phase, a system follows G98: UK Power Networks is notified within 28 days of commissioning and nothing has to be approved first.
Larger systems go through G99 instead, applied for before installation. On timing: Ofgem's guaranteed standard for a low voltage generation connection quotation is 45 working days, with £80 paid for each working day late, and it binds UK Power Networks as it does every network operator.
Sources: NESO DNO licence areas (3 May 2024); Ofgem, Distributed Generation Standards Direction guidance, checked 27 September 2026. G98 vs G99, explained.
Beyond the panels: heating and car charging in South Merstham
A heat pump in South Merstham
Heating demand peaks when solar is weakest. In South Merstham, a 12-panel system makes about 230 kWh in December and 240 kWh in January, a fraction of its 810 kWh in July, which is why a heat pump here is costed on its tariff first.
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 South Merstham
Summer is where a car earns its place. In July, 12 panels in South Merstham make about 810 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.
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.
Installed prices, the same in every town
Every system is designed around your roof on the free call before anything is fitted.
Solar panel servicing and repair in South Merstham
If a system in South Merstham is underperforming, start with the guides below: repair benchmarks, service scope, and the inverter question.
Common questions about solar in South Merstham
How much energy would 12 solar panels make in South Merstham?
South Merstham averages 2.82 peak sun hours a day, which PVGIS turns into 1,029 kWh per kWp a year. On a 12-panel, 6.36 kWp roof that is about 6,540 kWh, 68% of it between April and September.
What does a typical solar system cost in South Merstham?
Solar is priced at £1,000 per kWp installed wherever you live, so a 12-panel, 6.36 kWp system costs £6,360 in South Merstham, exactly as it would anywhere else, before any battery. Location changes what the system makes, not what it costs: here that is about 6,540 kWh a year. The final figure comes from your roof on the design call.
Who is the network operator in South Merstham, and do I need a G99 application?
The operator is UK Power Networks. 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. Ofgem's guaranteed standard for a low voltage generation connection quotation is 45 working days, with £80 paid for each working day late, and it binds UK Power Networks as it does every network operator. Your design call checks which route yours needs.
What happens to the solar I do not use in South Merstham?
Around £673 a year at 12p per kWh, for the roughly 5,608 kWh a 12-panel system in South Merstham 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 South Merstham in the winter months?
December is the weakest month in South Merstham: about 230 kWh from 12 panels, against 810 kWh in July. The panels still generate on bright winter days; they just cover a smaller share of what the house uses.
How South Merstham compares with its neighbours
The six closest towns we publish, run through the identical PVGIS query as South Merstham.
| Town | kWh per kWp a year | vs South Merstham |
|---|---|---|
| South Merstham | 1,029 | this town |
| Redhill | 1,033 | +4 kWh |
| Reigate | 1,040 | +11 kWh |
| Caterham | 1,031 | +2 kWh |
| Tadworth and Epsom Downs | 1,019 | −10 kWh |
| Banstead | 1,016 | −13 kWh |
| Warlingham | 1,017 | −12 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 South Merstham: Solar panels in South Merstham from OVO Solar & Battery
Also near South Merstham
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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.
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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.