Solar panels in Wales
Around the UK average, with the south coast doing better than the north.
Yield here
900
kWh per kWp per year
A 4 kWp system
3,600
kWh generated a year
Typical payback
7.6
years, south-facing
That is about 14% below Cornwall and Devon, the sunniest part of the UK — which sounds worse than it is. A 4 kWp system here still returns roughly £740 a year and pays for itself in 7.6 years.
Work out your own roof
4 kWp is about 10 panels
50% typical, 75% with a battery
Pays for itself in
7.6 years
£740 a year in Wales, against about £5,600 installed. Over 25 years you would be roughly £12,900 ahead.
Generated per year
3,600 kWh
900 kWh per kWp here
Used at home
1,800 kWh
£470 off your bill
Exported
1,800 kWh
£270 earned