PSW wrote:
what should I use to fasten this on the roof with?
What the roof is made of? if it's thin metal or fiberglass like on motorhomes, then 3M VHB "might" work but only if it's perfectly flat. I would still consider 4 anchor screws, one at each corner.
PSW wrote:
On the first panel I installed, I made struts, used Z mounts,
It's better to use L-mounts, with bolts into the panel sides. But with your particular panel this could be a challenge.
PSW wrote:
Since this one is light and flexible, it can be mounted directly flat on the roof
I'm not sure about that. Panel needs some space underneath for heat dissipation.
PSW wrote:
The diameter of the small grommets on the panel would only allow for using a screw of about 3/16" diameter
You don't need screws larger than #10, and you can drill your own holes for #10 where you want them.
PSW wrote:
This panel only weighs about four pounds
Because it has no glass. Monocrystalline cells are covered in clear plastic instead. I would be skeptical as to long-term performance, i.e. scratches and other things affecting transparency.
PSW wrote:
Some have been critical of the charge controller, but all I know is it works for me and can easily accomodate several of these panels.
Probably a separate topic, just wanted to note that there is more to controller than its ability to accommodate several panels. Adjustable setpoints and remote temperature compensation are very important.
