The two 130w Sun panels, mounted on off stern posts provide 13+ amps when the batteries need it. (Simple Xantrex 40 amp charge controller) Most of the time they are idling, as the 5 deep cycle group 31 batteries maintain a full charge, even with the refrigerator and house services running. Mfg quality of the panels is excellent.
The arches above the panels are charged with a electric fence current keeping the ospreys from landing, nesting, and turning the solar panels into a dinner plates for their fish dinners. That amount of shading is inconsequential. If I had room, I’d install more. We love the power! Maryland .