Aside from the obvious access guidelines....
Aside from the obvious access guidelines....
Please, oh, please, if you are an engineer or salesperson designing systems....consider that a human has to actually get on the roof and install the system you design! I have had to install modules that were virtually hanging off the roof, not fun, even with fall protection.
Also, most homes have gutters, and they are there for a reason. I am sadly anticipating the day when homeowners start blaming rotten sill plates on PV arrays that render the gutters useless.
A catch 22 I see everyday is a company requirement to install a permanent, stainless steel fall protection anchor on each array I install; yet most systems are squeezed so tight to the ridge that the anchor gets buried under the panels. I guess there's a little more to it than just having a place to bury your hatchet(to vent the roof), that's all