Do solar panels really have a lifespan of 25 years?

“Sellers claim photovoltaic panels can last 25 years. Is that just a gimmick?” This is a question many users have. To verify this, I found an old module installed in 2014 and disassembled it, revealing three key facts. First, as long as the core silicon wafer is physically intact, it will still generate electricity for 25 years. However, its efficiency will drop from 20% to around 16% (at a rate of 0.8% per year), fully meeting national standards. Second, regarding the frame and glass, high-quality aluminum alloy frames will remain rust-free for 10 years, and tempered glass will remain scratch-free. Low-quality frames will corrode in just five years. Third, the junction box and backsheet are consumable parts. The old module’s junction box is showing signs of aging, and the backsheet has minor cracks. However, these components are inexpensive to replace, costing only 200 yuan, and have no impact on overall performance.

I also consulted a professional testing agency, and they tested 100 ten-year-old modules. 95% of them still produced at least 80% of their initial output, fully meeting household electricity needs. The lifespan of photovoltaic panels actually depends on maintenance. Regular cleaning and avoiding heavy objects should give them 25 years of use. My neighbor installed photovoltaic panels in 2012, and they’re still generating electricity, so there’s no need to doubt their lifespan.