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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.
In the 90s, rooftop solar was around 10-15% efficient. Now rooftop panels are closer to 20%.
Some are 25% now, and don't even break the bank. You can get modules that store the power and feed it back into your house for use later. I kinda want to get some to offset heating and cooling costs.
https://us.ecoflow.com/products/175w-rigid-solar-panel?variant=41362064179273
That one doesn't seem like it's worth it at the regular price though, seeing as it's only 175W. You can get a 400W QCell Q.Peak panel for the same price or cheaper. I guess it's useful if your use case needs smaller panels.