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Solar Panel installation vs. Solar Shingles. The major difference between solar roof shingles and solar panels is in the installation process. Installers usually need to bolt solar panels onto the roof, which requires drilling through the roof and can violate its warranty.
Yes, almost certainly - as you say, they have significantly different expansion rates. Fortunately the situation with a fibreglass roof is different - the substrate for most flexible panels these days is aluminium, and this has a thermal expansion rate that is very similar to fibreglass.