Bringing this thread back to life. I found a couple of methods of installing panels that do not require roof penetration which should decrease installation time.
The first method is essentially a friction based solution. Place a polymer foam on the bottom of the mounting rails so the panels can't move and that's it. I think the article said it has been tested up to 130mph winds. You can read it.
https://www.solarpowerworldonline.co...olar-industry/
The other method lays a framework on both sides of a roof. On one side is just bare frame, on the other side the panels are installed. Makes sense. Keeps the panels from sliding down the roof and makes it more difficult for the wind to lift them. I'm sure a lot of people would have a problem with aesthetics with this one though.
https://cleantechnica.com/2015/12/13...certification/
JJ