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Quite sure mine had 30 years at 90 % . But it was the really good mono ones. Storage is a completely different story. But hey even if they are down to 25% I would keep them and just add new ones.
I just had some installed.
Guaranteed 80% efficiency for 20 years.I heavily doubt they will last 60 years.Had energy storage installed as well. Only guaranteed 90% (~4500 cycles) for 10 years.
EDIT: double checked the data sheet. They are actually 86% for 25 years with a rated 0.5% per year degradation rate.
Quite sure mine had 30 years at 90 % . But it was the really good mono ones. Storage is a completely different story. But hey even if they are down to 25% I would keep them and just add new ones.
0.5 would mean 30 for 60 years also…