Glamorgan
Solar panels in Caerphilly, designed on a free call.
Twelve panels (6.36 kWp) here make about 6,470 kWh a year for £6,360 installed, designed around your roof 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
Sunlight in Caerphilly, in numbers
From 34 kWh per kWp in December to 126.9 in May: a roof in Caerphilly makes 3.7 times as much in its best month as in its darkest, and 1,018 kWh per kWp across the year.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 36.8 |
| February | 54.9 |
| March | 88.8 |
| April | 116 |
| May | 127 |
| June | 125 |
| July | 125 |
| August | 109 |
| September | 93.9 |
| October | 63.9 |
| November | 44.1 |
| December | 34 |
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: Caerphilly makes 1,018 kWh per kWp a year, and the mean of our 85 county PVGIS estimates (our GB average) is 925, so Caerphilly is 10% above it.
How Caerphilly compares
Among the places we publish figures for, Caerphilly is one of 32 Glamorgan towns we track, and it ranks 16th of 32 for solar yield. It is a medium town in the House of Commons Library classification, with 33,416 residents, and its roofs see 2.79 peak sun hours a day across the year. That drives the standard 12 panel model to 6,474 kWh of generation, of which around 5,538 kWh is exported at 12p for £665 a year, with £247 saved on electricity you would otherwise buy at 26.32p.
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 Caerphilly's own yield.
Caerphilly is its own local planning authority area, and its House of Commons Library settlement class is 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.
Generation is modelled from PVGIS satellite data for Caerphilly's own coordinates (51.58017, -3.22734), using the same 26.32p/kWh import value and £1,000 per kWp installed pricing as every Clearline estimate; the methodology is on our help page.
NGED and your Caerphilly connection
The distribution network operator (DNO) for Caerphilly is National Grid Electricity Distribution (NGED), which runs the South Wales licence area.
For a typical home the paperwork is light: a system of up to 3.68kW per phase goes through G98, which means NGED is notified within 28 days of switch-on rather than asked beforehand.
Above that, G99 means applying before the work is booked. NGED's guaranteed standards give 45 working days for a low voltage generation quotation, with £80 paid for each working day late.
Sources: NESO DNO licence areas (3 May 2024); NGED, guaranteed standards of performance table, checked 25 September 2026. G98 vs G99, explained.
Beyond the panels: heating and car charging in Caerphilly
A heat pump in Caerphilly
Heating demand peaks when solar is weakest. In Caerphilly, a 12-panel system makes about 220 kWh in December and 230 kWh in January, a fraction of its 810 kWh in May, which is why a heat pump here is costed on its tariff first.
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 Caerphilly
Caerphilly's May output, about 810 kWh from 12 panels, is several times the 70 kWh or so a typical home uses in daylight that month on our calculator's settings. Daytime charging turns that surplus into miles.
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 Caerphilly
If a system in Caerphilly is underperforming, start with the guides below: repair benchmarks, service scope, and the inverter question.
Solar in Caerphilly: your questions answered
How much energy would 12 solar panels make in Caerphilly?
Caerphilly averages 2.79 peak sun hours a day, which PVGIS turns into 1,018 kWh per kWp a year. On a 12-panel, 6.36 kWp roof that is about 6,470 kWh, 68% of it between April and September.
Is solar more expensive in Caerphilly?
Prices on this site are the same everywhere: £1,000 per kWp installed, which puts a 12-panel system at £6,360 in Caerphilly, and a Duracell Dura16 installed with solar at £4,450 on top. The local part is generation, about 6,470 kWh a year here, which is what drives payback.
Who is the network operator in Caerphilly, and do I need a G99 application?
The operator is National Grid Electricity Distribution (NGED). 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. NGED's guaranteed standards give 45 working days for a low voltage generation quotation, with £80 paid for each working day late. Your design call checks which route yours needs.
What could I earn from exporting in Caerphilly?
On the 12p export scenario, a 12-panel system in Caerphilly sends about 5,538 kWh a year to the grid, worth around £665. The export rates table compares what each supplier pays.
How does solar perform in Caerphilly in the winter months?
December is the weakest month in Caerphilly: about 220 kWh from 12 panels, against 810 kWh in May. The panels still generate on bright winter days; they just cover a smaller share of what the house uses.
How Caerphilly 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 Caerphilly |
|---|---|---|
| Caerphilly | 1,018 | this town |
| Church Village | 1,001 | −17 kWh |
| Pontypridd | 997 | −21 kWh |
| Ystrad Mynach | 991 | −27 kWh |
| Pontllanfraith | 988 | −30 kWh |
| Cardiff | 1,024 | +6 kWh |
| Risca | 991 | −27 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 Caerphilly: Solar panels in Caerphilly 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.
Further reading for Caerphilly
Sourced, dated and written by us. The same ground we cover on your free call.
Back contact solar panels, explained for a UK roof
What back contact changes on a roof, compared fairly with TOPCon, with the makers' own claims labelled.
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 →What are the disadvantages of a heat pump? Six honest ones
Six real disadvantages, worth planning around rather than a reason to rule one out.
Read the guide →Why tariff choice moves payback more than kit choice
Identical kit, five times the export income. The tariff decision worked through with August 2026 rates.
Read the guide →NAPIT, NICEIC and competent person schemes: who tells building control about your solar
Solar work is notifiable. A competent person scheme means your installation team notifies, not you.
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.