Solar data studies
Original research built from the same engine behind our calculator: PVGIS climate data and a verified, resale-OK country dataset. Free to read, cite and reuse.
Dataset21 June 2026
Solar payback across European cities: the 2026 city-by-city dataset
The same 5 kWp system run through 26 European cities on real climate data. Ranked by payback, with the within-country yield spread.
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Dataset21 June 2026
Solar payback ranked: best and worst countries to go solar in 2026
The same 5 kWp system run through 24 countries on real climate data and verified tariffs. Ranked by return and payback.
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Dataset21 June 2026
How much does latitude matter? Solar yield from Oslo to Seville
The identical system across 24 cities from the Arctic to Andalusia. Yield climbs 2.29× as you head south — pure PVGIS, no FX.
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Dataset21 June 2026
EV charging on solar: how many panels it takes, country by country
The real kWh math for driving 12,000 km a year on sunshine, across 24 countries. From 5 panels in the sunniest to 10 in the cloudiest.
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