Solar panels in Wales

Q: How many solar panels do I need in Wales?

About 8 panels for a home using 2,500 kWh a year. Each 400W panel produces roughly 338 kWh annually at Wales sunlight levels. Your own figure depends on actual usage — pull a year of bills rather than assuming average consumption, since heating and EV charging change it a lot.

Q: How much do solar panels cost in Wales?

A 3.2 kW system runs about £5,440 before incentives, or roughly £1.70 per watt installed. Quotes vary widely by installer, roof complexity and whether your electrical panel needs upgrading — get three before deciding.

Roofs across Wales get about 993 hours of usable sunlight a year, and electricity costs 26.1p/kWh. That combination puts a typical system's payback at 12.2 years. Here's the detail, from real rooftop data across 7 Wales cities.

993Sun hours / yr

26.1pPer kWh

8Panels typical

12.2 yrPayback

Wales is a middling solar market. A 12.2-year payback still beats leaving the money in a savings account over 25 years, but it is not the slam dunk the ads suggest.

Check your own roof in Wales → These are regional figures; your roof's size, pitch and shading move them a lot.

How Wales compares

Wales gets more sunlight than 7% of the cities we measure, and its electricity costs more than 77% of states and provinces. Both matter, but not equally: the electricity rate usually matters more, because solar saves money by replacing power you would otherwise buy. A sunny state with cheap power often pays back slower than a cloudy state with expensive power. Why that happens →

Solar by city in Wales

City	Sun hrs/yr	Panels	Net cost	Payback
Newport	1,027	8	£5,440	11.9 yrs
Swansea	1,017	8	£5,440	11.9 yrs
Cardiff	1,009	8	£5,440	12 yrs
Merthyr Tydfil	993	8	£5,440	12.2 yrs
Carmarthen	970	8	£5,440	12.4 yrs
Bangor	938	8	£5,440	12.7 yrs
Wrexham	936	8	£5,440	12.7 yrs

What a system costs in Wales

System	Size	kWh/yr	Net cost	Saves/yr	Payback
8 panels	3.2 kW	2,701	£9,120	£705	12.9 yrs
12 panels	4.8 kW	4,051	£13,680	£1,058	12.9 yrs
16 panels	6.4 kW	5,402	£18,240	£1,410	12.9 yrs
20 panels	8 kW	6,752	£22,800	£1,763	12.9 yrs
26 panels	10.4 kW	8,778	£29,640	£2,292	12.9 yrs

Payback stops improving as systems grow, then gets worse. You can only save on electricity you were going to buy, so once a system covers your usage the extra panels mostly export at a lower rate.

Wales solar incentives

The 30% US federal tax credit does not apply in Canada, and the figures on this page exclude it. Canadian support comes through federal programmes such as the Canada Greener Homes Loan plus provincial and utility schemes, which vary and change — check current Wales programmes directly rather than trusting a figure on a website.

Check your net metering rules. What your utility credits you for exported power drives your return more than most rebates do, and it differs by utility.

Wales solar questions

Is solar worth it in Wales?

At 26.1p/kWh and 993 usable sun hours, a typical Wales system pays back in about 12.2 years and returns roughly £5,749 across a 25-year panel life. That is slower than average, so compare at least three quotes before committing. Individual cities in Wales vary widely around this average.

How many solar panels do I need in Wales?

About 8 panels for a home using 2,500 kWh a year. Each 400W panel produces roughly 338 kWh annually at Wales sunlight levels. Your own figure depends on actual usage — pull a year of bills rather than assuming average consumption, since heating and EV charging change it a lot.

How much do solar panels cost in Wales?

A 3.2 kW system runs about £5,440 before incentives, or roughly £1.70 per watt installed. Quotes vary widely by installer, roof complexity and whether your electrical panel needs upgrading — get three before deciding.

Worth reading before you buy

What you get paid for exported powerA 3p vs 15p tariff changes payback by years 12 questions to ask before signingIdentical systems vary 30–40% in price Is a battery worth it in the UK?UK guide What you get paid for exported powerUK guide

Regional estimates generated 2026-08-22 from Google Solar API rooftop samples across 7 Wales cities, and average Wales electricity rates. Not a quote and not financial or tax advice.