Glamorgan
Solar panels in Penarth, sized to your roof.
A 12-panel roof in Penarth makes about 6,710 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 Penarth can generate
Penarth's best month is May, at 134.4 kWh per kWp; December manages 33.6. Over the year that comes to 1,055 kWh per kWp, 12% above our Glamorgan county estimate.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 36.8 |
| February | 56 |
| March | 91.6 |
| April | 122 |
| May | 134 |
| June | 132 |
| July | 132 |
| August | 113 |
| September | 98.2 |
| October | 63.8 |
| November | 42.3 |
| December | 33.6 |
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: Penarth makes 1,055 kWh per kWp a year, and the mean of our 85 county PVGIS estimates (our GB average) is 925, so Penarth is 14% above it.
How Penarth compares
Among the places we publish figures for, Penarth is one of 32 Glamorgan towns we track, and it ranks 8th of 32 for solar yield. It is a medium town in the House of Commons Library classification, with 28,634 residents, and its roofs see 2.89 peak sun hours a day across the year. That drives the standard 12 panel model to 6,710 kWh of generation, of which around 5,773 kWh is exported at 12p for £693 a year, with £247 saved on electricity you would otherwise buy at 26.32p.
These are starting numbers, not a quote. The calculator below opens on Penarth's own PVGIS figure; change the panels, the battery or the export rate and it reruns. The design call replaces every assumption with your roof and your bills.
Penarth sits within Vale of Glamorgan, 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.
Generation is modelled from PVGIS satellite data for Penarth's own coordinates (51.438, -3.18443), 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 Penarth network
The distribution network operator (DNO) for Penarth is National Grid Electricity Distribution (NGED), which runs the South Wales licence area.
G98 is the simple route. If the inverter, plus any battery, stays at or under 3.68kW per phase, NGED only has to be told within 28 days after the system is commissioned.
Anything bigger is a G99 case and is applied for first. 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.
Adding a heat pump or an EV charger in Penarth
A heat pump in Penarth
Solar and a heat pump pull in opposite directions through the year: Penarth's roofs make 1,070 kWh from November to February on a 12-panel system, and 3,250 kWh from May to August. The heating season leans on the grid, so off-peak rates do the heavy lifting.
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 Penarth
A 12-panel roof in Penarth 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.
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.
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 Penarth
Guidance is nationwide, so the benchmarks hold in Penarth: repair costs, service scope, and when the inverter is the real fault.
Penarth solar questions
What could a roof in Penarth generate?
PVGIS puts a roof in Penarth at 1,055 kWh per kWp a year, 2.89 peak sun hours a day averaged across the seasons. A 12-panel, 6.36 kWp system makes about 6,710 kWh a year, most of it between April and September.
What would 12 solar panels cost in Penarth?
£6,360 for 12 panels (6.36 kWp), the same as in every other place we cover, because solar is priced at £1,000 per kWp installed rather than by area. A battery adds its own installed price on top. Where Penarth differs is output: about 6,710 kWh a year from that system.
Do I need permission from the DNO for solar in Penarth?
Usually not in advance. NGED, the network operator for Penarth, 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 would export pay on a system in Penarth?
It is exported. With typical use and no battery, about 5,773 kWh of the 6,710 kWh a 12-panel system makes in Penarth goes to the grid, around £693 a year at 12p. A battery keeps more of it for the evening; the export rates table shows what suppliers pay.
Do solar panels work in winter in Penarth?
Yes, at a lower level. PVGIS gives Penarth 33.6 kWh per kWp in December and 36.8 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 Penarth 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 Penarth |
|---|---|---|
| Penarth | 1,055 | this town |
| Dinas Powis | 1,058 | +3 kWh |
| Barry | 1,060 | +5 kWh |
| Cardiff | 1,024 | −31 kWh |
| Caerphilly | 1,018 | −37 kWh |
| Church Village | 1,001 | −54 kWh |
| Weston-super-Mare | 1,053 | −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 Penarth: Solar panels in Penarth from OVO Solar & Battery
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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 Penarth
Sourced, dated and written by us. The same ground we cover on your free call.
Microinverters, optimisers or a plain string inverter: who needs what
Shade and roof layout decide this. An honest triage of the three approaches.
Read the guide →How much a battery saves by charging on cheap night rates
What charging at 8.5p and using at 26.32p is actually worth over a year.
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 →How an air source heat pump actually works
It moves heat rather than making it. The cycle, the efficiency numbers and the trade-offs.
Read the guide →The price cap explained, and what it does to solar payback
The cap limits unit rates, not bills. That changes what solar payback means.
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.