Colored solar panels that mimic tiles roof hit 95% efficiency compared to regular solar tiles
(interestingengineering.com)
20% is what standard photovoltaics were doing a decade ago. I cannot wait until these are standard on all roofs in a few decades.
Edit: Yes I know the title is misleading, I'm saying these colored roof tiles are performing on par with the setup many Americans installed 10 years ago at the height if the subsidies.