The "perfect" panel for RV'ing in the shade would have bypass diodes between each and every cell. Unfortunately the only maker I am aware of that did do that is UniSolar and they have been out of business for a dozen years now.
Since I happen to have them, my system 'punches' above its weight as far as output goes with 256 watts from 4 panels wired in series/parallel for an input of 33 volts. I know BFL13 wants to know my amps at 12 volts--it works out to 17, post controller, if the battery bank is hungry. (voltage circa 15).
