Alberto,
You can plug your charger directly into the 120VAC outlet on your dock, won't hurt a thing. If you have a "modern" charger, leave it plugged in all the time as well. Remember to keep your shut-off valves closed, inspect your hoses for cracking and brittleness (replace if visual and tactile inspection shows these issues). Keep the cockpit clear of any debris (leaves and the like) that could clog your cockpit drains. And if you are going to be away from the boat for significant lengths of time, see if a buddy that lives close to the boat will keep a good eye on her, say a couple times a week. If you live close, well, never mind...
