So, after 10 years, you can expect your solar panels to be about 5-8% less efficient than they were when they were first installed. This loss can vary depending on the quality of the panels, installation conditions, and maintenance practices. Solar panels gradually degrade year after year, reducing their capacity to generate electricity. For an asset manager or investor. However, after 10 years of service, you might wonder, how efficient are 10-year-old solar panels? Is it still worth keeping them, or should you consider replacing them? What Happens to Solar Panel Efficiency Over Time? Understanding how solar panels degrade over time is key to assessing the. A Swiss university study of solar installations from the 1980s and '90s found many still generating most of their original power. A team of researchers from the University of Applied Sciences and Arts of Southern Switzerland led by Ebrar Özkalay recently completed a study that solar panels can last. Typically, the lifespan of solar panels is anywhere from 25 to 30 years, making them a remarkably durable component of solar photovoltaic (PV) systems. This longevity surpasses that of many other household systems, such as boilers, which usually have a life expectancy of 10 to 15 years.
