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Solar modules deployed in France in 1992 still provide 75.9% of original output power
(www.pv-magazine.com)
This is a most excellent place for technology news and articles.
What you are not considering is that silicon crystallisation and the PV panel manufacturing process in its entirety are very resource-intensive and energy-intensive. The longevity of solar panels is one of their core properties that contribute to their high degree of sustainability.