I mean 1873 and 1954 as the beginnings of solar cells kind of suggests we had manufacturing challenges to over come to make them viable. These manufacturing techniques were driven by the semi-conductor industry. So isn’t like we were sitting doing nothing in adjacent technologies.
So yes if solar panels did not exist today we could quickly accelerate to where we are today by utilizing the tech created in adjacent fields.
I think at most you would be talking 5 years.
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