SOL Solutions has several nifty looking solar energy products. Not sure how some of them might play on a boat, but their portable power unit could be very handy if you are building "remote" from utilities.
You can combine up to three panels for more generation. Neat design.
Mobile Solar Generators
PLUG AND PLAY PORTABLE GREEN POWER NOW!
Perfect point of use, off the grid, alternative to old paradigm, noisy gas generators.
Clean, silent, renewable energy that you own, with no ongoing costs ever!
One small, easy to move, all in one integrated unit, ready to point towards the sun at your best location, and deliver up to 1200 watts of AC power, and 12 volts DC power,â€¨and even charge all your Ni-Mh smaller batteries.
Elegantly designed unit including, one 135 watt photovoltaic panel, three 100 amp/hour deep cycle sealed batteries, solar charge controller, watt Meter, 1500 watt inverter/charger, external AC/DC plugs.
All in a sleek, simple, two-wheel, cart.