When deciding where to install your solar panels, keep them away from the radar dome, flagstaff and other structures that would cast a shadow on their surfaces. Even a small shadow significantly reduces power output. Popular locations include the hardtop, Bimini top, radar arch, coachroof and deck. You'll want to be able to reach them for routine cleaning, since dust and dirt lowers their output. Heat also degrades solar-panel output, so it's important to provide air circulation under them. Most solar panels use either a monocrystalline or multicrystalline cell and have a tempered glass surface, which you cannot walk on. SunWare, a German manufacturer, makes a lower-profile unit that can tolerate limited, light foot traffic and does not require air circulation underneath.