On average, most modern solar panels degrade at a rate of 0. 5% of their original generation capacity after 25 years. That said, some premium solar panel models have lower degradation rates closer. But, as with any significant investment, smart homeowners usually wonder: How long are these solar panels going to last? The short answer is: quite long a time! Solar panels, like all technical equipment, wear down over time and may require replacing. The good news, however, is that they degrade. Although solar panels are highly durable, typically under warranty for 25+ years, they will naturally exhibit diminished performance throughout their lifespan. How fast they lose their power, how long warranties last and what to do to prolong the lifespan of your solar system — here in this article. Degradation rates these days are so low that, so long as quality panels are used, it's no longer something most homeowners need to worry about. But choosing panels with a lower. Most PV modules in the industry have a standard lifespan of 25 years, but some leading companies in the solar industry like Maxeon Solar have developed this technology to create solar panels lasting for 40 years or more, covered by a 40-year warranty.