How long is the life of solar panels?

Domestic solar panel manufacturers generally guarantee the service life of the panels, and the power generation will be above 85% after 25 years. Is this guarantee credible? Several examples show that this guarantee is credible. \x0d\ 1987 The panel used for building photovoltaic stations in Tibet was tested and attenuated by 9% last year; The panel used in a photovoltaic power station in Gansu province 26 years ago has attenuation of16%; The panel of a power station in Shenyang decayed 6% in 23 years. This measured data tells us that the service life of the main equipment panel of solar power station is set at 30 years. What will happen in 30 years still needs facts, because this is a new technology after all. \x0d\ The life of photovoltaic module is determined by its power generation efficiency, and the combination degree of PN junction and the purity of silicon wafer determine the power intensity generated by solar panel under the same illumination. Over time, the PN junction will be continuously broken down, so the efficiency will be continuously reduced. After 15, the conversion efficiency will be above 90%, and it will drop to about 85% after 25 years, so the life of photovoltaic modules is basically over 20 years. \x0d\ There is also a flexible bending module, arc photovoltaic panels and flexible solar panels. The general service life of these panels is about 15 years, and they are mostly used for electric cars or street lamps.