PMY - Power&Motoryacht

$29.99; www.sunforce.com

Use the 1.8-watt Solar Battery Maintainer from Sunforce to keep your batteries charged even when you’re anchored and listening to the stereo for hours. Plug the charger into your boat’s 12-volt power socket, or use the included alligator clamps to connect it directly to the battery. Position the panel on your vessel’s windshield with included suction cups to pick up the most daylight possible, though it charges even on cloudy days.