This is mainly due to Light-Induced Degradation (LID), which affects panels during their first day or two in sunlight, but then stops. How bad it is depends on the type of panel. Most solar panel companies will provide a standard 25-year warranty for the expected life expectancy of the solar panels. After 25 years, your solar panels won't necessarily need to be. Solar panels degrade at 0. 5% per year and last 25-30+ years. Most panels are warranted for 25 years, but real-world data shows they continue. For utility-scale solar developers, EPCs, asset managers, and financiers, the performance and durability of photovoltaic (PV) panels directly influence project bankability, return on investment (ROI), and long-term asset valuation. Over time, their performance decreases due to various factors like exposure to sunlight, weather conditions, and even the quality of materials used in their production. The process is known as 𝐝𝐞𝐠𝐫𝐚𝐝𝐚𝐭𝐢𝐨𝐧. The degradation. 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.