Metered, not modelled
Exeter vs Luton
Exeter roofs made about 2% more than Luton roofs last year.
852 against 836 kWh per kWp at the median, from 211 and 60 real systems.
Where the two actually overlap
Both areas, grouped by what each system made. The medians differ, but the shapes sit largely on top of one another — a good Luton roof beats a poor Exeter one comfortably. Location moves the odds; it does not decide the outcome.
Exeter: the middle half of 211 systems made 765–923 kWh per kWp. Luton: the middle half of 60 systems made 749–875 kWh per kWp.
Both figures are what real systems metered last year, so the gap mixes sunlight with system age, roof direction and shading. It is the difference in what people actually got, not a difference in sunshine alone.
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Output figures from openclimatefix/uk_pv (Hugging Face, CC-BY-4.0), collected by Sheffield Solar. How we measure.
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