A recent Swiss university study has found that solar panels can last a lot longer than their typical 25-year warranty might suggest. Researchers analyzed six solar systems installed between 1987 and 1993, which have been in continuous operation since, and found most panels still producing more than 80% of their original output after nearly four decades.
This study highlights the durability of early 1990s module designs featuring EVA encapsulants, Tedlar backsheets, and robust framed glass/foil structures. The findings suggest that physical loads on the panels are the biggest drivers of degradation, but also reveal clear differences between material quality, even within the same module family.
This challenges business models, replacement schedules, and recycling policies designed around the traditional 25-year warranty period. As a result, homeowners should not be worried about buying a home with a 5-10 year old system already in place.
The study's results also support lower levelised cost of energy (LCOE), reduced carbon footprints, and extended performance warranties. With over 70% of renewable electricity capacity added from PV in 2023, this news is especially welcome as it provides clean, emissions-free energy for decades to come.
3% of global electricity demand. The study's methodology and findings can be explored online, and homeowners are encouraged to share their thoughts in the comments.
This study provides valuable insights into the long-term reliability of solar panels, which will help inform business models, replacement schedules, and recycling policies. As a result, we can expect to see more durable and efficient solar panel designs in the future.
