Swiss Study: Photovoltaic Systems Exceed Expectations

Researchers from the University of Applied Sciences of Southern Switzerland (SUPSI) have conducted a recent study on six old photovoltaic (PV) systems in Switzerland. The results show that the modules still deliver over 80 percent of their original rated output even after three decades. These findings could significantly influence the discussion about the lifespan and efficiency of solar systems. The investigation included PV systems that were installed in the 1990s. The researchers analyzed both the technical performance and the condition of the modules.

Various factors such as material fatigue and environmental influences were considered to obtain a comprehensive picture of the longevity of the systems. A key finding of the study is that most of the examined systems exhibited no significant performance losses despite their age. This contrasts with earlier assumptions that suggested a considerably shorter lifespan for PV modules. The researchers emphasize that the results underscore the need for a reassessment of the lifespan of solar systems. The study was conducted as part of a project to promote renewable energies.

The aim was to document the actual performance of older PV systems and assess their contribution to energy supply. The researchers hope that their findings will help strengthen confidence in the technology and increase the acceptance of solar systems. Another aspect of the investigation was the analysis of the maintenance and upkeep practices of the operators. The researchers found that regular maintenance and monitoring of the systems are crucial for long-term performance. Operators who pursued proactive maintenance strategies were able to significantly enhance the efficiency of their systems.

The results of the study could also impact future planning and installation of PV systems. Given the high efficiency of older systems, it may be sensible to operate existing systems longer rather than replacing them prematurely. This could not only bring economic benefits but also contribute to reducing waste and resource consumption. The researchers plan to publish their findings in scientific journals and present them at conferences to further advance the discussion on the lifespan of PV systems. The study could also serve as a foundation for future research projects focusing on the longevity and efficiency of solar technologies.

The investigation was completed in April 2026, and the results are considered groundbreaking for the solar industry. The researchers hope that their work will help increase the acceptance of solar energy and further promote the use of renewable energies in Switzerland. The study highlights that the long-term use of PV systems is not only ecologically sensible but also brings economic advantages. Operators of older systems could benefit from the insights by operating their systems more efficiently and maximizing the lifespan of their investments. The University of Applied Sciences of Southern Switzerland (SUPSI) plans to deepen the results of the study in further research projects.

Particular attention will be paid to the development of new materials and technologies that could further increase the lifespan of PV systems. The study shows that photovoltaic technology has great potential for the future. With proper care and maintenance, solar systems can reliably deliver energy for many years. The researchers emphasize that the results of the study could also be relevant for other countries that employ similar technologies. The investigation was conducted by an interdisciplinary team comprising experts from engineering, environmental sciences, and economics.

This collaboration has helped develop a comprehensive understanding of the challenges and opportunities in the field of photovoltaics. The results of the study could also influence policymakers looking to create incentives for the use of renewable energies. The researchers recommend developing programs to promote the maintenance and upkeep of PV systems to extend their lifespan. The study was published on April 30, 2026, and the results will be presented at the upcoming renewable energy conference in Bern.