Questions You Should Ask

Forget 'up to 30%'. Realistic today is rather 15-20% of investment costs through the one-off remuneration (EIV).

The 2026 Formula:

• Base contribution: CHF 350.- one-off
• Power: CHF 320.- per kWp (up to 30 kWp)

Pro Tip: Apply for the subsidy immediately after commissioning. The pots are filled, but processing takes time.

In cantons with high taxes (e.g., Bern, Vaud), you often save more through tax deduction than through subsidies.

Example: Investment CHF 25,000. Marginal tax rate 30%.
Tax savings = CHF 7,500.
Pronovo subsidy = approx. CHF 4,000.

Warning: This only applies to existing buildings. For new builds, solar is 'mandatory' and usually not deductible.

Hardly anymore. Most cantons (e.g., Zurich, Aargau) have stopped their storage subsidies as storage is now more economical.

Exception: Geneva and Thurgau (partially) still have programs. Check this carefully before buying.

The installer must register the system with Pronovo. Important for you: Demand a copy of the registration confirmation. Without correct registration (certification by SiNa), no money flows.

Hardware prices (modules) are in the basement, but Swiss labor costs remain high.

Realistic guide prices (turnkey):

• 10 kWp (Single-family house): CHF 22,000 - 26,000
• Surcharge storage (10 kWh): + CHF 8,000 - 12,000

Caution: Offers under CHF 20,000 for 10 kWp often save on safety (scaffolding) or components (cheap inverters).

Calculated seriously: 10 to 14 years.

Anyone promising you '5 years' is calculating with unrealistically high electricity prices or ignoring operating costs. Since a system lasts 30 years, it is still an excellent investment – better than any savings account.

Yes, the imputed rental value can rise if the system is classified as 'value-enhancing'. Mostly, however, solar is considered 'value-preserving' (energy-saving).

Expert Advice: Spread the tax deduction over 2 or 3 years to break the progression. Our calculator shows you if this is possible.

In the Midlands (fog): Little. Expect only 2-5% of annual yield in December/January.

The Solution: Steep roofs (or facades) help in winter as snow slides off and the low sun is captured better. Flat roofs are often covered in snow in winter = Zero production.

Glass-glass modules are more durable (30+ years warranty) but more expensive. Glass-foil modules are often sufficient.

More important than the module: The inverter and cabling. This is where most failures occur.

Only with shading (chimney, trees, dormers). On a clear roof, optimizers are unnecessary technology that can break. A good string inverter is often more efficient and cheaper.

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