Harvest
the Swiss sun.
Enter your address and get an instant estimate of yield, investment and payback for your roof. If you want, we'll compare 2–3 quotes from certified installers near you.
Database
Nearly all Swiss roofs (Sonnendach)
Climate reference
MeteoSwiss 1991–2020
Accuracy
LiDAR terrain model
How it works
Three steps. No sales pressure.
01
Enter your address
Type your address — we locate your building on the official Swiss map (LV95), no trackers.
02
See your roof's potential
We read every roof surface from the federal Sonnendach dataset — area, irradiation, orientation and tilt.
03
Compare local quotes
If you want, we collect 2–3 comparable quotes from certified installers near you — you pick the best one.
Methodology
Open and reproducible.
All calculations are based on public federal data. We publish every assumption — you can recompute the result yourself.
See full methodology →Annual yield
Σ stromertrag (Sonnendach) — fallback Σ irrad × 0.20 × 0.80
Investment
CHF 2'000–2'500 / kWp installed
Panel density
200 W / m² of usable area
Why HelveSolar
What you get.
- 01
Federal data, not marketing estimates — straight from Sonnendach (SFOE).
- 02
One file, multiple local quotes — comparable and laid out neutrally.
- 03
No hidden fees — you pay the installer, not us.
- 04
On-site visit arranged by the installer you choose.
FAQ
Common questions.
Is the analysis really free?+
Yes. The analysis is fully free and non-binding. You commit to nothing.
Where does the roof data come from?+
From official Swiss federal sources: SFOE Sonnendach (solar potential per roof surface) and swisstopo (addresses, terrain model, aerial imagery).
Will I be flooded with installer phone calls?+
No. You'll receive 2–3 written proposals by email. No installer gets your phone number until you choose to reach out.
How accurate is the estimate?+
Typical accuracy is ±15–20 %. That is enough for a go/no-go decision. A binding offer requires an on-site visit by an installer.
Will my data be shared?+
Your contact details are forwarded only to the installers we select for your file — and only after your explicit consent. No ad networks, no data brokers. Hosting in the EU.