Metered, not modelled
Ipswich vs Exeter
Ipswich roofs made about 1% more than Exeter roofs last year.
860 against 852 kWh per kWp at the median, from 763 and 211 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 Exeter roof beats a poor Ipswich one comfortably. Location moves the odds; it does not decide the outcome.
Ipswich: the middle half of 763 systems made 786–914 kWh per kWp. Exeter: the middle half of 211 systems made 765–923 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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