I don't think panel size is relevant, more important specs might be belt width, overall length, and chamber length. The panels heat the chamber, and that's what's important in getting the ink to temp. I've seen conveyors advertising the number of panels, but not neccisarily the size of the panels. You may want to PM @unikink, he prints huge images, and uses discharge, maybe he could
Offer some insight for you on dryers.