Metered, not modelled
Warrington vs Birmingham
Warrington roofs made about 1% more than Birmingham roofs last year.
771 against 767 kWh per kWp at the median, from 123 and 150 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 Birmingham roof beats a poor Warrington one comfortably. Location moves the odds; it does not decide the outcome.
Warrington: the middle half of 123 systems made 709–816 kWh per kWp. Birmingham: the middle half of 150 systems made 701–814 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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