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We'll run the figure for your address and reply by email.
While you wait
- How the calculator works, and what it deliberately leaves out.
- Where to put it, including the balcony rule that came in on 27 August 2026.
- Questions people ask us, about the rules, the kit and your network operator.
Try a different spot while you wait
Your region, your surface, your figure
—kWh a year
Generation from PVGIS, the European Commission’s Photovoltaic Geographical Information System, for an 800 watt device with 14 per cent system losses, queried 13 September 2026. One representative point per region, unshaded. A ceiling under ideal conditions, not a forecast for your particular wall, and not the same thing as a saving: this figure is generation in kWh, and the calculator does not turn it into a price because no UK installed cost or tariff is sourced.