Can you provide any more details regarding your scenario? Is it a specific style of roof? Or material?
And what are the significant costs regarding roof vs non-roof installation?
In our situation the only suitable place to put panels was on the roof, so it wasn’t an option. But I’m keen to understand the factors.
2) Now the panels have to be removed and re-installed any time those parts of the roof are worked on. That's expensive. Roofing companies tend not to like solar. You'll have trouble getting a warranty on the work if you've got solar, and likely pay a premium for a company that'll provide one (on top of the much higher labor costs) by finding a company that does both solar and roofing.
3) If work ever needs to be done on the panels, and it doesn't fall under a warranty, it'll be more expensive than ground-level.
4) There's a greater chance of something going wrong with all the above because solar adds more components to the whole system of the roof, aside from punching a bunch of holes in it.
The higher costs and risks plus naturally long pay-off period mean I don't plan to ever pay for rooftop solar again. Wish I hadn't this time.