Metered, not modelled
Solar output in Chelmsford
734–883 kWh per kWp a year
the middle half of 75 real Chelmsford systems, measured over 2024
- Systems measured 75
- Median 835
- Best 10% of roofs 924
- Rank of 49 areas 7th
- Typical system size 3 kWp
A typical 4 kWp system here made roughly 2,940 to 3,530 units of electricity last year.
Not a forecast. 75 solar systems around Chelmsford were metered through 2024, and the middle half made 734 to 883 kWh for every kWp of panels.
The best tenth reached about 924 kWh per kWp — some 21% clear of the British median of 766, and among the strongest roofs we can measure anywhere.
That puts Chelmsford 7th of the 49 postcode areas we can measure.
At the other end, the quietest tenth of systems here made about 609 kWh per kWp — usually shade, a poor direction, or both.
What none of it tells you is what your own roof would do. These systems point in every direction and some have been up for fifteen years.
The spread behind that number
Every Chelmsford system, grouped by what it made, against Britain as a whole. The two shapes overlap heavily, which is the honest headline: your postcode nudges the result, your roof decides it.
Chelmsford: the middle half of 75 systems made 734–883 kWh per kWp.
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Areas near Chelmsford
Neighbouring postcode areas we can also measure.
How Chelmsford compares
Looking for someone to fit them? MCS-certified solar installers in Chelmsford are listed in the Solarable directory.
Output figures from openclimatefix/uk_pv (Hugging Face, CC-BY-4.0), collected by Sheffield Solar. The British median is 766 kWh per kWp. How we measure.
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