For monocrystalline silicon the most commonly used panel for commercial and residential pv the degradation rate is less than 0 5 for panels made before 2000 and less than 0 4 for panels made after 2000.
Monocrystalline solar panel lifespan.
Talking about the overall lifespan of a solar panel it may live up to 25 to 30 years depending on the installation conditions and type of material used for its production.
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On this parameter of lifespan polycrystalline solar panels are not very different but the warranty period offered by the manufacturers may vary.
For instance if you have installed monocrystalline panels you can continue to use them without any issue for more than 25 years.