In addition to flex and impact, I have experienced leaky junction boxes on the surface of the panels, and failures of the cigar-shaped diode junction in the cable (factory-integral to the design). All of the Sunware units I owned came with non-tinned wire. Still, they and Ganz-type clones are well suited for marine compared with other designs I've looked at. I'm not a fan of glass-faced panels on a boat.