The lifespan of solar panels can vary depending on several factors, including the quality of the panels, installation, climate and maintenance. In general, solar panels are designed to operate efficiently over a long period of time.
Most manufacturers offer warranties ranging from 20 to 25 years on the power output of the solar panels, suggesting that they retain at least a certain percentage of their original output over that period. However, this does not mean that solar panels suddenly become useless after 20 or 25 years. Many solar panels continue to perform well for many years after the warranty expires, although possibly with reduced efficiency.
Studies show that solar panels can still retain around 80% of their original output after 25 years, and some panels can even last longer. So, with regular maintenance and careful installation, solar panels can be a very long-lasting and cost-effective investment for renewable energy generation.