Glamorgan
Solar panels in Sarn, Tondu and Bryncethin.
Twelve panels here make about 6,730 kWh a year for £6,360 installed, designed on a free 30-minute video call.
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What a roof in Sarn, Tondu and Bryncethin can generate
PVGIS puts Sarn, Tondu and Bryncethin at 1,058 kWh per kWp a year, 13% above our Glamorgan county estimate. 69% of it arrives between April and September, peaking in May.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 36.6 |
| February | 56.9 |
| March | 92.9 |
| April | 123 |
| May | 134 |
| June | 130 |
| July | 130 |
| August | 114 |
| September | 97.5 |
| October | 65.8 |
| November | 43.9 |
| December | 32.8 |
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 1,058, Sarn, Tondu and Bryncethin is 14% above it.
How Sarn, Tondu and Bryncethin compares
Small towns rarely get published solar figures, so here are the numbers for Sarn, Tondu and Bryncethin. It is one of 32 Glamorgan towns we track, and it ranks joint 5th of 32 for solar yield, a town of 12,020 people in the House of Commons Library settlement data. PVGIS gives its roofs 1,058 kWh per kWp a year, 2.90 peak sun hours a day averaged across the seasons, and the standard 12 panel model turns that into £942 of year one benefit, £247 of it from your own generation and £695 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 Sarn, Tondu and Bryncethin's own yield.
Sarn, Tondu and Bryncethin sits within Bridgend, its local planning authority, and the House of Commons Library classes it 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.
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Generation is modelled from PVGIS satellite data for Sarn, Tondu and Bryncethin's own coordinates (51.54526, -3.58315), 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.
Connecting solar to the Sarn, Tondu and Bryncethin network
Sarn, Tondu and Bryncethin is served by National Grid Electricity Distribution (NGED): the town's centre falls inside its South Wales licence area on NESO's boundary map.
Most home systems stay within 3.68kW per phase of inverter output, which puts them on G98, a notification to NGED within 28 days of switch-on. Panel count does not decide it; the inverter and any battery do.
A bigger inverter or battery output needs a G99 application in advance. 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 Sarn, Tondu and Bryncethin
A heat pump in Sarn, Tondu and Bryncethin
Solar and a heat pump pull in opposite directions through the year: Sarn, Tondu and Bryncethin's roofs make 1,080 kWh from November to February on a 12-panel system, and 3,230 kWh from May to August. The heating season leans on the grid, so off-peak rates do the heavy lifting.
Grant support in Wales 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 Sarn, Tondu and Bryncethin
A 12-panel roof in Sarn, Tondu and Bryncethin makes about 850 kWh in May. A typical home uses around 70 kWh of that in daylight (the calculator's typical-use settings), which leaves most of the month's output for an EV or for export.
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).
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 Sarn, Tondu and Bryncethin
Guidance is nationwide, so the benchmarks hold in Sarn, Tondu and Bryncethin: repair costs, service scope, and when the inverter is the real fault.
Common questions about solar in Sarn, Tondu and Bryncethin
What could a roof in Sarn, Tondu and Bryncethin generate?
PVGIS puts a roof in Sarn, Tondu and Bryncethin at 1,058 kWh per kWp a year, 2.90 peak sun hours a day averaged across the seasons. A 12-panel, 6.36 kWp system makes about 6,730 kWh a year, most of it between April and September.
How much are solar panels in Sarn, Tondu and Bryncethin?
The price does not move by postcode. At £1,000 per kWp installed, 12 panels (6.36 kWp) come to £6,360 in Sarn, Tondu and Bryncethin before a battery. What Sarn, Tondu and Bryncethin changes is the return, about 6,730 kWh a year from that system, and your design call prices your actual roof.
Do I need permission from the DNO for solar in Sarn, Tondu and Bryncethin?
Usually not in advance. NGED, the network operator for Sarn, Tondu and Bryncethin, 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. NGED's guaranteed standards give 45 working days for a low voltage generation quotation, with £80 paid for each working day late. "See our DNO explainer.
How much can I earn from exporting solar in Sarn, Tondu and Bryncethin?
With typical use and no battery, a 12-panel system in Sarn, Tondu and Bryncethin exports about 5,792 kWh a year. At 12p per kWh that is roughly £695; 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 Sarn, Tondu and Bryncethin?
Yes, at a lower level. PVGIS gives Sarn, Tondu and Bryncethin 32.8 kWh per kWp in December and 36.6 in January, so a 12-panel system makes about 210 kWh and 230 kWh in those months, against 850 kWh in May. Winter output mostly covers daytime use rather than exporting.
How Sarn, Tondu and Bryncethin compares with its neighbours
The six closest towns we publish, run through the identical PVGIS query as Sarn, Tondu and Bryncethin.
| Town | kWh per kWp a year | vs Sarn, Tondu and Bryncethin |
|---|---|---|
| Sarn, Tondu and Bryncethin | 1,058 | this town |
| Bridgend | 1,057 | −1 kWh |
| Pencoed | 1,051 | −7 kWh |
| North Cornelly and Kenfig Hill | 1,059 | +1 kWh |
| Maesteg | 954 | −104 kWh |
| Llanharan and Brynna | 1,044 | −14 kWh |
| Porthcawl | 1,059 | +1 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 Sarn, Tondu and Bryncethin: Solar panels in Sarn, Tondu and Bryncethin 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.
Guides worth reading before your call
Sourced, dated and written by us. The same ground we cover on your free call.
How many solar panels do I need? The honest way to count
One panel is 2.26 square metres. The rest is measuring your roof honestly.
Read the guide →Whole home backup or partial backup? The runtime arithmetic
Whole home backup sounds obvious until you do the runtime maths. Here is how to choose the right tier.
Read the guide →The main home EV chargers, compared on what actually differs
Eight popular UK home chargers on cable, connectivity, warranty and tariff integration.
Read the guide →Are heat pumps worth it? The real 2026 numbers
Electricity costs 3.3x gas per kWh. A heat pump is about 3x as efficient. The numbers nearly cancel 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 →HIES explained: what the badge actually protects, and when
What HIES protects: deposits up to 25 percent capped at 5,000 pounds, and your workmanship guarantee.
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.