Metered, not modelled
North Wales vs Ipswich
North Wales and Ipswich roofs made much the same last year.
861 against 860 kWh per kWp at the median, from 53 and 763 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 Ipswich roof beats a poor North Wales one comfortably. Location moves the odds; it does not decide the outcome.
North Wales: the middle half of 53 systems made 828–896 kWh per kWp. Ipswich: the middle half of 763 systems made 786–914 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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