Metered, not modelled
Swindon vs Stockport
Swindon and Stockport roofs made much the same last year.
755 against 753 kWh per kWp at the median, from 119 and 120 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 Stockport roof beats a poor Swindon one comfortably. Location moves the odds; it does not decide the outcome.
Swindon: the middle half of 119 systems made 666–847 kWh per kWp. Stockport: the middle half of 120 systems made 704–786 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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How sunlight falls on a UK roof, month by month.
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