Solaranlage Wartung Schweiz: Kosten, Intervalle & was wirklich zählt

In Switzerland there is no statutory obligation to maintain solar installations – but the economic incentive is considerable. Having your PV system regularly maintained protects an investment in the five-to-six-figure Swiss franc range, secures warranty claims and avoids silent yield losses that can cost thousands of francs over the years. This guide explains what Swiss PV operators need to know about maintenance and why thermographic inspection is the most important instrument.

No maintenance obligation – but economically indispensable

Switzerland has no statutory maintenance obligation for photovoltaic installations – neither for private households nor for commercial operators. This absence of an obligation has a drawback: many system operators neglect maintenance until a problem becomes visible in the monitoring. That is too late. Silent yield losses from undetected defects can amount to 3–8% of annual production – for a 200 kWp system with 180,000 kWh annual yield and a feed-in tariff of CHF 0.10/kWh that is CHF 540–1,440 per year going unnoticed.

The economic incentive for regular maintenance is particularly strong in Switzerland: Hohe Strompreise machen jeden Prozentpunkt Ertragsverlust teurer als in anderen Ländern. Attraktive Einmalvergütungen (EIV) have led to high investments that must be protected through maintenance. And kantonale Gebäudeversicherungen can reduce claims settlements with inadequate documentation.

What maintenance and inspection costs in Switzerland

Note: our prices follow the German calculation model and are invoiced in euros. Travel costs to Zurich (approx. 870 km), Bern (approx. 860 km) or Basel (approx. 770 km) are calculable in the Preisrechner sofort kalkulierbar.

Empfohlene Wartungsintervalle

Swissolar – the Swiss industry association for solar energy – recommends an annual visual inspection and a thorough inspection every 2–4 years for PV systems. CKW and other Swiss energy suppliers recommend a maintenance contract with regular monitoring for systems from 100 kWp. Thermographic inspection should take place every 2 years for commercial systems, annually for systems in exposed locations (alpine sites, hail-prone).

After extreme weather events – hail, storm, lightning – always inspect promptly and unplanned. Switzerland records increased hail frequency in certain regions (Mittelland, pre-Alps) that can cause lasting damage to PV systems.

Thermography as the core of the maintenance strategy

Swiss PV operators who rely on monitoring alone systematically overlook defects at individual module level. A string with 5% yield loss from a hotspot barely registers in the monitoring – in the thermogram it is immediately visible. Thermography is therefore the only reliable way to know the actual condition of a system.

For Swiss building insurers – whether cantonal monopoly insurers (AGV, GVB, GVZ) or private providers – a standards-compliant thermography report to IEC TS 62446-3 is the recognised basis for hail damage settlements. Operators without thermographic documentation are in a weaker negotiating position in claims settlements.

Swissolar and Swiss standards

Swissolar is the recognised industry association and publishes recommendations on maintenance intervals and quality standards. We fulfil the requirements of IEC TS 62446-3 and our reports are accepted by Swiss insurers and institutional investors. On request we produce reports bilingually (German/French) for operators in western Switzerland.

Wartung ab 100 kWp: Was sich ändert

From 100 kWp Swiss energy suppliers such as CKW and Helion explicitly recommend a maintenance contract. Drone thermography becomes particularly economical at this size: a 200 kWp system can be completely surveyed in 2–3 hours; a technician would need 1–2 days for a manual inspection. From 500 kWp the annual complete inspection with hand thermography of BOS components is clearly economically worthwhile.

Building insurance and maintenance obligation

In 19 Swiss cantons there are cantonal building insurance monopolies. These generally insure PV systems automatically as part of the building. For hail or fire damage the documentation of the system condition is decisive – regular thermographic inspection provides this documentation. Cantons such as Zurich (GVZ), Bern (GVB) and Aargau (AGV) accept IEC-compliant thermography reports as damage evidence.

Kantonale Besonderheiten

Swiss energy policy is shaped at cantonal level. Some cantons have their own PV subsidy programmes that require regular maintenance documentation. In the cantons of Vaud and Geneva PV systems are particularly well supported by cantonal programmes; here a maintenance obligation can arise indirectly from the subsidy conditions. For cantons with a large proportion of alpine ground-mounted systems (Valais, Graubünden, Uri) we recommend alpine-specific inspection protocols.

Frequently asked questions