Solar calculator · free
What would a solar system on your roof bring you?
Enter your address, check the roof faces, answer a few short questions. You receive system size, yield, cost, subsidies and payback for your building.
- Federal roof dataArea, pitch and solar irradiation of every roof face (sonnendach.ch).
- Electricity price of your municipalityElCom tariff 2026 instead of the Swiss average.
- Checked by a project managerOn request a free site visit and a binding quote within 72 hours.
Prefer to call? 044 980 08 80
718 kWp built. From single-family homes to a 150 kWp commercial roof.
- Member of
smart-me Partner 2025
Next step
Have the figures checked on site, free of charge.
Zarko Mitrovic will call you within one working day. During the visit we check the roof, electrical system and consumption. Afterwards you receive a binding quote within 72 hours.
Zarko MitrovicSolar project manager
Prefer to talk straight away?
044 980 08 80
Frequently asked questions
Questions about the solar calculator
Is the site visit really free?
Yes. The visit and the quote cost you nothing and commit you to nothing. You only decide once you hold the binding quote in your hands.
How accurate is the solar calculator?
It gives guide values, not a quote. It uses the federal roof data (sonnendach.ch), the electricity price of your municipality (ElCom 2026) and the one-off payment from Pronovo. What it cannot see: roof condition, shade from trees, electrical system, access. That is why we check these during a free site visit and send you a binding quote within 72 hours.
Where does the roof data come from?
From the Swiss Federal Office of Energy (sonnendach.ch). It records area, pitch, orientation and solar irradiation of every roof face of every building in Switzerland. The aerial image is from swisstopo. We count about 70 % of the area as panel area; the rest is needed for edges, gaps and roof windows.
Which subsidies are included?
The federal one-off payment (Pronovo): CHF 360 per kWp for systems below 30 kWp, proportionally less above. Plus the tax deduction for existing private buildings, calculated with a marginal tax rate of 25 %. Cantonal and municipal grants are not included; we check them during the site visit.
Is a battery worth it?
A battery raises self-consumption but costs more. Whether it pays depends on the feed-in tariff and your consumption. That is why the calculator shows both options side by side.
Why do you need my contact details?
We send you the results by e-mail, and a project manager looks at the figures. We do not pass on your details. We are not a referral portal; we plan and build the systems ourselves.
Which regions do you cover?
All of German-speaking Switzerland. We build most often in the cantons of Zurich, St. Gallen, Schwyz and Aargau. Our locations are in Zumikon ZH and Lachen SZ.