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Solar modules deployed in France in 1992 still provide 75.9% of original output power
(www.pv-magazine.com)
this post was submitted on 07 Jun 2024
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Careful using the word efficiency there, as it has a different meaning when talking about solar panels - it indicates how much energy the panel can extract from the light hitting it. The best modern panels you can buy are below 25% efficient, and since these are from the 90s they were probably about half that when new.