Carmarthenshire, Wales
Solar and batteries in Carmarthenshire, sized to your roof.
Twelve panels (6.36 kWp) here make about 5,960 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
Carmarthenshire's solar year
PVGIS puts Carmarthenshire at 937 kWh per kWp a year, 1% above the mean of our 85 county estimates. 70% of it arrives between April and September, peaking in May.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 30 |
| February | 49.1 |
| March | 83.5 |
| April | 113 |
| May | 121 |
| June | 117 |
| July | 114 |
| August | 102 |
| September | 86.8 |
| October | 57.8 |
| November | 37.7 |
| December | 25.9 |
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 937, Carmarthenshire is 1% above it.
How Carmarthenshire compares
Carmarthenshire ranks 42nd of the 85 counties we track for solar yield, 2% above the Wales average of our estimates. At 2.57 peak sun hours a day the sums lean on a healthy mix: £247 of the year one benefit here comes from solar you use yourself, with export at 12p adding £603.
Every figure here assumes a clear, south-facing roof at 35 degrees in the middle of Carmarthenshire. Yours will differ; the calculator below lets you test panels, batteries and export rates first.
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 Carmarthenshire (51.9018, -4.1655), 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.
Who runs the grid in Carmarthenshire
The centre of Carmarthenshire sits in National Grid Electricity Distribution's South Wales licence area on NESO's boundary map, as does every town we cover there, so NGED is the network operator (DNO) a system here is registered with.
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.
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 Carmarthenshire
A heat pump in Carmarthenshire
A heat pump does most of its work from November to February. Over those four months, 12 panels in Carmarthenshire make about 910 kWh, against 2,880 kWh from May to August, so winter heating runs mostly on grid electricity and the tariff matters more than the roof.
In Wales, 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 Carmarthenshire
A 12-panel roof in Carmarthenshire makes about 770 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.
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 in Carmarthenshire: your questions answered
What does a solar panel system produce in Carmarthenshire?
Each kWp of panels in Carmarthenshire makes 937 kWh a year on PVGIS figures, so a typical 12-panel system produces around 5,960 kWh, from about 160 kWh in December up to 770 kWh in May.
How much are solar panels in Carmarthenshire?
The price does not move by postcode. At £1,000 per kWp installed, 12 panels (6.36 kWp) come to £6,360 in Carmarthenshire before a battery. What Carmarthenshire changes is the return, about 5,960 kWh a year from that system, and your design call prices your actual roof.
Would a system in Carmarthenshire need approval from the network operator?
Carmarthenshire is on National Grid Electricity Distribution's network (South Wales licence area). Systems up to 3.68kW per phase of inverter output follow G98: NGED is notified within 28 days of commissioning, with no approval needed first. Anything larger needs a G99 application before installation. NGED's guaranteed standards give 45 working days for a low voltage generation quotation, with £80 paid for each working day late. Our G98 vs G99 guide explains both routes.
How much can I earn from exporting solar in Carmarthenshire?
With typical use and no battery, a 12-panel system in Carmarthenshire exports about 5,023 kWh a year. At 12p per kWh that is roughly £603; a supplier paying more, or a battery that keeps more for the evening, changes the figure. See the export rates table.
Is solar worth it in Carmarthenshire in winter?
It works, but the year is lopsided. 70% of a Carmarthenshire roof's output lands between April and September; the four months from November to February give about 910 kWh on a 12-panel system. Payback is worked out on the whole year, not the winter.
Towns we cover in Carmarthenshire
3 Carmarthenshire 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 Carmarthenshire homeowners
The same guidance we would talk through on your call, written down and sourced.
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The largest UK study found a 6.1% to 7.1% sale price premium. Here is the full picture.
Read the guide →Does a standalone battery actually pay back?
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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 →Are heat pumps noisy? The 37 dB(A) answer, in plain terms
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Read the guide →Will energy prices keep rising, and by how much
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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.