General questions about solar panels in Switzerland

They can be, but the result depends on full cost, confirmed grants, output and the share consumed on site. Compare avoided purchases and export income, then deduct maintenance, losses and replacements. Calculate payback under several tariff scenarios; neither future price increases nor a fixed payback period are guaranteed.

Modules can operate for several decades. Product and performance warranties are separate and depend on the model. Check guaranteed residual output, exclusions, installation conditions and after-sales service. The inverter and other components may need replacement during that period.

The procedure depends on the building, zoning and integration. A sufficiently roof-adapted installation may qualify for notification in building and agricultural zones under Article 18a of the Spatial Planning Act. Protected properties and certain areas have other requirements. Ask the municipality which procedure and timetable apply before work starts.

Yes, they also use diffuse light. Output depends on irradiance, temperature, model, orientation and shading; no single percentage describes every cloudy day. A monthly roof simulation and full-cost calculation help assess the project.

Snow can cover modules and load the roof and mountings. Check the model's permitted load and the system design for the site. Snow does not always slide off quickly. Avoid climbing onto the roof or scraping modules; have a professional assess a concerning accumulation.

Yes, if the structure, waterproofing and mounting system allow it. Compare south-facing and east-west layouts considering area, wind, snow, row shading, drainage and access. Bifacial gain depends in particular on albedo and mounting and should be simulated.

Check usable area, orientation, pitch, seasonal shading, roof condition and load-bearing capacity. Also consider grid connection, protection constraints and hourly consumption. A tool such as PVGIS provides an initial estimate; a site visit and project simulation should confirm the assumptions. There is no universal minimum area or orientation.