Pembrokeshire
Solar panels in Haverfordwest, sized to your roof.
A 12-panel roof in Haverfordwest makes about 6,510 kWh a year and costs £6,360 installed; a free 30-minute video call sizes it to yours.
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Haverfordwest's solar year
From 29.1 kWh per kWp in December to 131.6 in May: a roof in Haverfordwest makes 4.5 times as much in its best month as in its darkest, and 1,023 kWh per kWp across the year.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 33.9 |
| February | 55.8 |
| March | 89.5 |
| April | 121 |
| May | 132 |
| June | 129 |
| July | 125 |
| August | 112 |
| September | 92.6 |
| October | 62.8 |
| November | 40.8 |
| December | 29.1 |
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: Haverfordwest makes 1,023 kWh per kWp a year, and the mean of our 85 county PVGIS estimates (our GB average) is 925, so Haverfordwest is 11% above it.
How Haverfordwest compares
Small towns rarely get published solar figures, so here are the numbers for Haverfordwest. It is one of 4 Pembrokeshire towns we track, and it ranks 4th of 4 for solar yield, a town of 12,789 people in the House of Commons Library settlement data. PVGIS gives its roofs 1,023 kWh per kWp a year, 2.80 peak sun hours a day averaged across the seasons, and the standard 12 panel model turns that into £915 of year one benefit, £247 of it from your own generation and £668 from export at 12p.
These are starting numbers, not a quote. The calculator below opens on Haverfordwest'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.
Pembrokeshire is the planning authority covering Haverfordwest, which the House of Commons Library classes as a small 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 Haverfordwest's own coordinates (51.81016, -4.97117), 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 Haverfordwest
Haverfordwest is served by National Grid Electricity Distribution (NGED): the town's centre falls inside its South Wales licence area on NESO's boundary map.
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.
Adding a heat pump or an EV charger in Haverfordwest
A heat pump in Haverfordwest
A heat pump does most of its work from November to February. Over those four months, 12 panels in Haverfordwest make about 1,020 kWh, against 3,160 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 Haverfordwest
A 12-panel roof in Haverfordwest makes about 840 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.
What the named kit costs, installed
Every system is designed around your roof on the free call before anything is fitted.
Solar panel servicing and repair in Haverfordwest
Faults, servicing and ageing inverters follow the same economics in Haverfordwest as anywhere else, and the guides below price them plainly.
Common questions about solar in Haverfordwest
What does a solar panel system produce in Haverfordwest?
Each kWp of panels in Haverfordwest makes 1,023 kWh a year on PVGIS figures, so a typical 12-panel system produces around 6,510 kWh, from about 190 kWh in December up to 840 kWh in May.
What would 12 solar panels cost in Haverfordwest?
£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 Haverfordwest differs is output: about 6,510 kWh a year from that system.
Would a system in Haverfordwest need approval from the network operator?
Haverfordwest 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 would export pay on a system in Haverfordwest?
It is exported. With typical use and no battery, about 5,570 kWh of the 6,510 kWh a 12-panel system makes in Haverfordwest goes to the grid, around £668 a year at 12p. A battery keeps more of it for the evening; the export rates table shows what suppliers pay.
Is solar worth it in Haverfordwest in winter?
It works, but the year is lopsided. 70% of a Haverfordwest roof's output lands between April and September; the four months from November to February give about 1,020 kWh on a 12-panel system. Payback is worked out on the whole year, not the winter.
How Haverfordwest 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 Haverfordwest |
|---|---|---|
| Haverfordwest | 1,023 | this town |
| Milford Haven | 1,095 | +72 kWh |
| Pembroke Dock | 1,080 | +57 kWh |
| Pembroke | 1,086 | +63 kWh |
| Carmarthen | 980 | −43 kWh |
| Llanelli | 1,064 | +41 kWh |
| Gorseinon | 1,040 | +17 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 Haverfordwest: Solar panels in Haverfordwest from OVO Solar & Battery
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.
Further reading for Haverfordwest
Sourced, dated and written by us. The same ground we cover on your free call.
What a solar service costs, and how often you actually need one
MCS advises a contractor visit at year 10 on a privately owned home. Most plans sell one a year.
Read the guide →Whole home backup or partial backup? The runtime arithmetic
Whole home backup sounds obvious until you do the runtime maths. Here is how to choose the right tier.
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 →Are air source heat pumps any good? What owners actually report
The UK's largest survey found 80% of heat pump owners satisfied, against 70% for gas boilers.
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 →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.