I want to make a water feature using a 1.5A 12v pump that runs off of a 12v battery that is recharged by a solar panel. I am trying to figure out what size of solar panel I will need to recharge the battery each day so the battery doesn't die. The pump would only be ran around 5 hours a day, if that. The solar panel I found was really small, only $20, and only 2w. My main question is how long would it take a 2w solar panel to recharge a 12v marine battery to full?