One solution for keeping a docked or trailered boat's batteries topped up without running an extension cord:
http://www.amazon.com/dp/B004Q83TGO/ref ... bvb0Q8D9MW
Note that the 5W, 10W, and 15W panels shown don't need the solar panel charger controller listed on the page to work - the controller is meant for use with other manufacturer's solar panels.
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