MaxxFan Deluxe & Solar Panel Derate

I am giving some thought to installing a Maxxfan Deluxe on our 400, though we do have the factory solar on the roof.  I am concerned how much the shaded area of the closed vent cover (that overhangs the panel) will derate the energy output of the solar panel.  I don’t know how the thin panel is wired, but typically there are groups of wired cells within a single panel, such that a small shaded area can have a much greater impact on the solar output.  For instance, a 5-10% shading on a standard panel will cause a 25-30% reduction in panel output due to the grouping of the wiring circuits within the panel.

I am curious if any 400 owners with factory solar and a MaxxFan Deluxe have noticed, or better yet, measured the derate of the panel when the cover is shading part of it.