Today's PV Magazine (email@example.com) describes a new solar
panel that is up to 25x more efficient when shaded than a standard panel.The company is Optivolt (optivolt.com) and their web site is pretty sparse, but any system that works would be optimum for boats (not one of their listed potential uses). The PV magazine article has more info than their website and it is accessible with a google
search. Our Beneteau
49 with 4 panels
had wide power output variations from shading and we learned to "solar tack" on the hook to minimize shading by the boom.