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2 points

Yeah I guess but then you need a big roof probably. I was hoping they could be more efficient to double their performance, so half the space could be used (and possible half the cost).

But we will see :)

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3 points

There is not much room for optimization left. Best solar cells get close to 23% efficiency, apparently the current theoretical maximum is a little over 30%.

https://en.m.wikipedia.org/wiki/Shockley–Queisser_limit

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