I've been giving some thought to systems for a boat with electric propulsion and recharging it. Obviously using solar panels is a pretty common solution for charging the battery bank but as most panels seem to mounted in a fixed position they are very rarely at the optimum position for maximum output. One option would be to mount the panels that would normally be fixed to an arch on tiltable and rotatable poles instead. It may mean less total panel area but would the efficiency gains of adjusting throughout the day be worth it? Here's a couple of examples and some anecdotal evidence from the panel on Kapowai that indicates the potential.