Metered, not modelled
Plymouth vs Redhill & Reigate
Plymouth and Redhill & Reigate roofs made much the same last year.
804 against 802 kWh per kWp at the median, from 74 and 62 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 Redhill & Reigate roof beats a poor Plymouth one comfortably. Location moves the odds; it does not decide the outcome.
Plymouth: the middle half of 74 systems made 607–905 kWh per kWp. Redhill & Reigate: the middle half of 62 systems made 752–846 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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