Metered, not modelled
Solar output in Southampton
698–864 kWh per kWp a year
the middle half of 145 real Southampton systems, measured over 2024
- Systems measured 145
- Median 796
- Best 10% of roofs 905
- Rank of 49 areas 19th
- Typical system size 2.9 kWp
A typical 4 kWp system here made roughly 2,790 to 3,460 units of electricity last year.
Not a forecast. 145 solar systems around Southampton were metered through 2024, and the middle half made 698 to 864 kWh for every kWp of panels.
A good roof does better still: the top tenth here reached around 905 kWh per kWp, against a British median of 766.
The local roof stock is unusually well pointed: 96% of these systems face south, south-east or south-west, against 86% nationally. Some of the figure above is orientation rather than weather.
That places Southampton 19th of 49, ahead of 30 of the areas we can measure.
At the other end, the quietest tenth of systems here made about 607 kWh per kWp — usually shade, a poor direction, or both.
What none of it tells you is what your own roof would do. These systems point in every direction and some have been up for fifteen years.
The spread behind that number
Every Southampton system, grouped by what it made, against Britain as a whole. The two shapes overlap heavily, which is the honest headline: your postcode nudges the result, your roof decides it.
Southampton: the middle half of 145 systems made 698–864 kWh per kWp.
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Areas near Southampton
Neighbouring postcode areas we can also measure.
How Southampton compares
Looking for someone to fit them? MCS-certified solar installers in Southampton are listed in the Solarable directory.
Output figures from openclimatefix/uk_pv (Hugging Face, CC-BY-4.0), collected by Sheffield Solar. The British median is 766 kWh per kWp. How we measure.
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What a kWp really generates in Britain, modelled and metered.
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How we measure
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How much sun does my roof get?
How sunlight falls on a UK roof, month by month.
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