We seem to have pigeons camping over night under the solar panels. Not sure if they have nested. The panels provide shelter from the wind and possibly some heat in them from heating up in the day.
The panels are mounted on horizontal unitstrut, so there must be atleast 6cm for flying rats to get under the panels.
You can use mesh to go around the panels to keep them out, I have seen this on a couple of houses now. There are companies that can remove any nests that are there and fit the mesh.
The side of the house you could do off laders, may need scafolding for the front. I have contacted 2 companies that specialise in removal of pigeons and adding mesh. Neither of them have come back. Why set up a company and not get back to people?
One I dont a few days ago looks like a live chat on thier webiste, but its automated and ends up going via facebook. The other company I contacted over a month ago, and nothing back.
Fingers crossed I hear from someone soon. Havn't a clue what it would cost.