Eli5: Why didn’t some form of solar shingle/form end up successful?

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I know there probably is a good reason, either the tech, financial trade offs, etc.

And I’m not a homeowner but I’ve been watching on the topic lately.

Wouldn’t serving as a roof have a significant offset to the true cost? Even at 50% off the roof?

It seems they do the opposite, build on the existing ones.

Edit roof not form

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