If installed properly (tight) then it keeps squirrels out. I can’t guarantee a good installation, unfortunately. That’s up to the customer. One customer claims that squirrels did get in, so he bends the bottom of the screen outward, so the squirrel is standing on it and can’t pull it out. I recommend bending/folding it under at the bottom (easier than cutting) because it looks better and creates more direct pressure onto the roof, to keep it in place.
The Solar Mesh is made of weather-resistant style black-coated galvanized steel wire, with a PVC coating so it will be difficult for a rodent to get through.
We recommend skirting the bottom when you install the mesh in order to reinforce the bottom so that nothing can squeeze under as well. That said, the screen must be installed under tension as the clips won’t hold without proper tension.
Essentially, if the screen stays in place before you tighten the hardware, then you’re doing it right.
Critters can cause damage under your home solar panels. Installing a squirrel guard on your solar system can help avoid that. In particular, birds and squirrels are known to cause the most damage when they chew through wires, build nests, damage shingles and cause roof leaks.