Glamorgan
Solar panels in Merthyr Tydfil, sized to your roof.
About 5,990 kWh a year from 12 panels in Merthyr Tydfil, £6,360 installed, with your system designed on a free 30-minute video call.
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or call 07782 219224
- Free 30-minute video design call
- Priced before anyone visits
- Installed by our MCS-certified, fully insured teams
Merthyr Tydfil's solar year
From 29.6 kWh per kWp in December to 119.3 in May: a roof in Merthyr Tydfil makes 4 times as much in its best month as in its darkest, and 942 kWh per kWp across the year.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 32.6 |
| February | 48.5 |
| March | 84.3 |
| April | 111 |
| May | 119 |
| June | 115 |
| July | 115 |
| August | 101 |
| September | 89.7 |
| October | 57.2 |
| November | 39.8 |
| December | 29.6 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
For scale: 942 kWh per kWp in Merthyr Tydfil against 925, our GB average (the mean of our 85 county PVGIS estimates), which puts Merthyr Tydfil 2% above it.
How Merthyr Tydfil compares
Among the places we publish figures for, Merthyr Tydfil is one of 32 Glamorgan towns we track, and it ranks 28th of 32 for solar yield. It is a medium town in the House of Commons Library classification, with 40,949 residents, and its roofs see 2.58 peak sun hours a day across the year. That drives the standard 12 panel model to 5,991 kWh of generation, of which around 5,054 kWh is exported at 12p for £607 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 Merthyr Tydfil's own yield.
Planning applications in Merthyr Tydfil go to its own council, 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 Merthyr Tydfil's own coordinates (51.75413, -3.37757), 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.
Who runs the grid in Merthyr Tydfil
On NESO's licence-area map, Merthyr Tydfil is in South Wales, which National Grid Electricity Distribution (NGED) operates. That makes NGED the network operator for any system fitted here.
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 Merthyr Tydfil
A heat pump in Merthyr Tydfil
A heat pump does most of its work from November to February. Over those four months, 12 panels in Merthyr Tydfil make about 960 kWh, against 2,860 kWh from May to August, so winter heating runs mostly on grid electricity and the tariff matters more than the roof.
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 Merthyr Tydfil
A 12-panel roof in Merthyr Tydfil makes about 760 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 Merthyr Tydfil
Faults, servicing and ageing inverters follow the same economics in Merthyr Tydfil as anywhere else, and the guides below price them plainly.
Solar in Merthyr Tydfil: your questions answered
What does a solar panel system produce in Merthyr Tydfil?
Each kWp of panels in Merthyr Tydfil makes 942 kWh a year on PVGIS figures, so a typical 12-panel system produces around 5,990 kWh, from about 190 kWh in December up to 760 kWh in May.
How much are solar panels in Merthyr Tydfil?
The price does not move by postcode. At £1,000 per kWp installed, 12 panels (6.36 kWp) come to £6,360 in Merthyr Tydfil before a battery. What Merthyr Tydfil changes is the return, about 5,990 kWh a year from that system, and your design call prices your actual roof.
Would a system in Merthyr Tydfil need approval from the network operator?
Merthyr Tydfil 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 Merthyr Tydfil?
With typical use and no battery, a 12-panel system in Merthyr Tydfil exports about 5,054 kWh a year. At 12p per kWh that is roughly £607; 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 Merthyr Tydfil in winter?
It works, but the year is lopsided. 69% of a Merthyr Tydfil roof's output lands between April and September; the four months from November to February give about 960 kWh on a 12-panel system. Payback is worked out on the whole year, not the winter.
How Merthyr Tydfil compares with its neighbours
The six closest towns we publish, run through the identical PVGIS query as Merthyr Tydfil.
| Town | kWh per kWp a year | vs Merthyr Tydfil |
|---|---|---|
| Merthyr Tydfil | 942 | this town |
| Aberdare | 940 | −2 kWh |
| Mountain Ash | 948 | +6 kWh |
| Tredegar | 950 | +8 kWh |
| Ebbw Vale | 945 | +3 kWh |
| Bargod | 985 | +43 kWh |
| Rhondda | 882 | −60 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 Merthyr Tydfil: Solar panels in Merthyr Tydfil from OVO Solar & Battery
Also near Merthyr Tydfil
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.
Solar panel types, and the four numbers that actually matter
TOPCon, HJT and back contact decoded, plus the four numbers worth comparing.
Read the guide →Does a standalone battery actually pay back?
No panels means one job: buy cheap, use later. The tariff decides whether it pays.
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 →How much does a heat pump cost? The 2026 numbers, before and after the grant
UK median installed cost around £12,908, before the up to £7,500 grant comes off.
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 →What MCS certification actually is, and why your export payments depend on it
The badge that decides whether your solar earns export payments. It cannot be added later.
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.