Solar payback calculator (your language)
Available in 4 languagesSolar payback 2026: kWp + subsidy + ROI
Country selector for DE/AT/CH/ES. With feed-in tariff, self-consumption, storage, KfW/Pronovo/IDAE subsidies and Brent sensitivity.
Open solar calculator →More calculators (in German)
These calculators are written in native German due to country-specific terminology (KfW-458, Raus aus Öl + Gas, Gebäudeprogramm). The German energy market vocabulary does not translate 1:1 and the calculators are designed for DACH residents.
- DEHeat-pump subsidy Germany (KfW-458, up to 23,500 EUR)→
- DEHeat-pump subsidy Austria (Raus aus Öl + Gas, 9 federal states)→
- DEHeat-pump subsidy Switzerland (Building Programme + 26 cantons)→
- DECO2-price heating oil Germany (BEHG → ETS-2 path until 2030)→
- DECO2-price heating oil Austria (NEHG)→
- DEHeating comparison multi-vertical (5 types, score algorithm)→
- DEGo to full German calculator hub→
Why our calculators are different (USPs)
Live Brent anchor from 5 APIs (10-minute cache), pass-through factors scientifically calibrated (1.1 % per USD heating oil, 0.3 % electricity), CO2-pricing modeled with BEHG and ETS-2 to 2030, 9-source methodology with pratfall disclaimers, country-specific native content, sensitivity slider live in every result, 100 % anonymous, no email required.
Status May 2026. Verified values from KfW, OeMAG, Pronovo, IDAE, BAFA, BMWK.