I think the solar panel charger is a good one. It should top off your batteries while the boat is just sitting at the dock. If the panel is small enough, then you can just wire it directly to the battery, and won't need a charge controller.
However, you're really much better off sizing the battery according to the loads you're going to put on the battery.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.