Monmouthshire, Wales
Solar and batteries in Monmouthshire, sized to your roof.
A 12-panel roof in Monmouthshire makes about 6,370 kWh a year and costs £6,360 installed; a free 30-minute video call sizes it to yours.
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Monmouthshire's solar year
PVGIS puts Monmouthshire at 1,002 kWh per kWp a year, 8% above the mean of our 85 county estimates. 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 |
| February | 52.6 |
| March | 86.2 |
| April | 115 |
| May | 124 |
| June | 124 |
| July | 124 |
| August | 108 |
| September | 94.1 |
| October | 62.8 |
| November | 42.4 |
| December | 32.3 |
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 1,002, Monmouthshire is 8% above it.
How Monmouthshire compares
Monmouthshire ranks 23rd of the 85 counties we track for solar yield, 9% above the Wales average of our estimates. At 2.74 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 £652.
Treat these as calibration rather than a quote. The calculator below opens on Monmouthshire'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 Monmouthshire (51.7182, -2.9484), 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 Monmouthshire
The centre of Monmouthshire 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.
What decides the paperwork is the inverter and battery output, not the number of panels. Up to 3.68kW per phase, a system follows G98: NGED is notified within 28 days of commissioning and nothing has to be approved first.
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.
Heat pumps and EV charging in Monmouthshire
A heat pump in Monmouthshire
A heat pump does most of its work from November to February. Over those four months, 12 panels in Monmouthshire make about 1,040 kWh, against 3,050 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 Monmouthshire
From April to September, 69% of a Monmouthshire roof's yearly output arrives, peaking at about 790 kWh in May 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.
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.
Installed prices, the same across Monmouthshire
Every system is designed around your roof on the free call before anything is fitted.
Monmouthshire solar questions
What does a solar panel system produce in Monmouthshire?
Each kWp of panels in Monmouthshire makes 1,002 kWh a year on PVGIS figures, so a typical 12-panel system produces around 6,370 kWh, from about 210 kWh in December up to 790 kWh in May.
How much are solar panels in Monmouthshire?
The price does not move by postcode. At £1,000 per kWp installed, 12 panels (6.36 kWp) come to £6,360 in Monmouthshire before a battery. What Monmouthshire changes is the return, about 6,370 kWh a year from that system, and your design call prices your actual roof.
Would a system in Monmouthshire need approval from the network operator?
Monmouthshire 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 Monmouthshire?
With typical use and no battery, a 12-panel system in Monmouthshire exports about 5,436 kWh a year. At 12p per kWh that is roughly £652; 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 Monmouthshire in winter?
It works, but the year is lopsided. 69% of a Monmouthshire roof's output lands between April and September; the four months from November to February give about 1,040 kWh on a 12-panel system. Payback is worked out on the whole year, not the winter.
Towns we cover in Monmouthshire
16 Monmouthshire towns have their own page, each with PVGIS figures, a network operator and a monthly curve for its own location.
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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.
Reading for Monmouthshire homeowners
The same guidance we would talk through on your call, written down and sourced.
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 →Tesla Powerwall 3 against the alternatives, and where each one wins
The strongest single box in the market, and the houses it is still wrong for.
Read the guide →Home EV charger types and speeds, explained properly
Granny cable, 7kW wall unit or 22kW three phase. What each adds per hour, and which you need.
Read the guide →Sizing a heat pump: what a proper survey covers
Sized by calculation, not by rule of thumb. What the survey covers, and what guessing costs.
Read the guide →What the Smart Export Guarantee actually is
The scheme obliges suppliers to pay above zero, and leaves the rate to them.
Read the guide →Your MCS certificate: what it shows, when it arrives, and how a Smart Export Guarantee supplier uses it
The document your export payments hang on. Who issues it, what it shows, and how to get a copy.
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.