Metered, not modelled
Dartford vs Norwich
Dartford roofs made about 1% more than Norwich roofs last year.
831 against 819 kWh per kWp at the median, from 52 and 64 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 Norwich roof beats a poor Dartford one comfortably. Location moves the odds; it does not decide the outcome.
Dartford: the middle half of 52 systems made 765–881 kWh per kWp. Norwich: the middle half of 64 systems made 740–903 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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