Caernarfonshire, Wales
Solar panels across Caernarfonshire, designed on a free call.
A 12-panel roof in Caernarfonshire makes about 4,610 kWh a year and costs £6,360 installed; a free 30-minute video call sizes it to yours.
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- Free 30-minute video design call
- Priced before anyone visits
- Installed by our MCS-certified, fully insured teams
What a roof in Caernarfonshire can generate
From 5.8 kWh per kWp in December to 112.7 in June: a roof in Caernarfonshire makes 19.4 times as much in its best month as in its darkest, and 725 kWh per kWp across the year.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 7.8 |
| February | 24.3 |
| March | 62.8 |
| April | 95.4 |
| May | 112 |
| June | 113 |
| July | 104 |
| August | 86.6 |
| September | 66.9 |
| October | 35.5 |
| November | 11.2 |
| December | 5.8 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
For scale: 725 kWh per kWp in Caernarfonshire against 925, our GB average (the mean of our 85 county PVGIS estimates), which puts Caernarfonshire 22% below it.
How Caernarfonshire compares
Caernarfonshire ranks 84th of the 85 counties we track for solar yield, 21% below the Wales average of our estimates. Lower light changes the strategy rather than the answer: pair the array with off peak charging at 8.5p and the model still finds £687 a year on a typical 12 panel system, most of it from cutting 26.32p imports.
Treat these as calibration rather than a quote. The calculator below opens on Caernarfonshire's own PVGIS yield and prices a 12 panel system at £6,360 installed before any battery; your free design call reworks every number for your roof.
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 from PVGIS v5.2 (European Commission JRC, SARAH3), retrieved August 2026 for a representative point in Caernarfonshire (53.0514, -4.1562), assuming 1 kWp, 14% system loss, 35 degree pitch, due south. Import valued at 26.32p/kWh (Ofgem price cap average, Oct to Dec 2026); off-peak charging at 8.5p/kWh where used (a supplier's published off-peak rate, checked September 2026); export at the scenario you pick, from the dated tariff table. Prices are installed pricing, August 2026, standard installations; 530W LONGi panels at £1,000 per kWp. Estimates for illustration, not a quote: your free design call prices your actual roof.
Connecting solar to the Caernarfonshire network
On NESO's licence-area map, the middle of Caernarfonshire falls in North Wales, Merseyside and Cheshire, which SP Energy Networks operates, and so do all the towns we cover in the county.
For a typical home the paperwork is light: a system of up to 3.68kW per phase goes through G98, which means SP Energy Networks is notified within 28 days of switch-on rather than asked beforehand.
Anything bigger is a G99 case and is applied for 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 SP Energy 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.
Heat pumps and EV charging in Caernarfonshire
A heat pump in Caernarfonshire
Solar and a heat pump pull in opposite directions through the year: Caernarfonshire's roofs make 310 kWh from November to February on a 12-panel system, and 2,640 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 Caernarfonshire
From April to September, 80% of a Caernarfonshire roof's yearly output arrives, peaking at about 720 kWh in June on 12 panels. A car parked at home in daylight can soak up what the house, at around 70 kWh of daytime use that month, cannot.
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).
What the named kit costs, installed
Every system is designed around your roof on the free call before anything is fitted.
Solar in Caernarfonshire: your questions answered
What could a roof in Caernarfonshire generate?
PVGIS puts a roof in Caernarfonshire at 725 kWh per kWp a year, 1.99 peak sun hours a day averaged across the seasons. A 12-panel, 6.36 kWp system makes about 4,610 kWh a year, most of it between April and September.
What would 12 solar panels cost in Caernarfonshire?
£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 Caernarfonshire differs is output: about 4,610 kWh a year from that system.
Do I need permission from the DNO for solar in Caernarfonshire?
Usually not in advance. SP Energy Networks, the network operator for Caernarfonshire, 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. 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 SP Energy Networks as it does every network operator. "See our DNO explainer.
How much would export pay on a system in Caernarfonshire?
It is exported. With typical use and no battery, about 3,674 kWh of the 4,610 kWh a 12-panel system makes in Caernarfonshire goes to the grid, around £441 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 Caernarfonshire?
Yes, at a lower level. PVGIS gives Caernarfonshire 5.8 kWh per kWp in December and 7.8 in January, so a 12-panel system makes about 40 kWh and 50 kWh in those months, against 720 kWh in June. Winter output mostly covers daytime use rather than exporting.
Towns we cover in Caernarfonshire
4 Caernarfonshire towns have their own page, each with PVGIS figures, a network operator and a monthly curve for its own location.
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.
Reading for Caernarfonshire homeowners
The same guidance we would talk through on your call, written down and sourced.
How to clean solar panels, and whether you need to at all
Cleaning is oversold and pigeon mesh is undersold. The numbers behind both.
Read the guide →What a battery gateway actually does
Without a gateway your system shuts down when the grid does. Here is what the box actually does.
Read the guide →Smart charge point regulations, explained
Why your charger arrives pre-set to charge overnight, and why it waits before it starts.
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.