CTEK (56-677) D250S 5-Step， Automatic DUAL 12 Volt 20 Amp Battery Charger<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Obtains and optimizes energy from DC sources such as alternators， solar panel or wind power to charge battery</li><li>Automatically selects best and most efficient source of up to 2 that are connected to the charger for charging battery</li><li>Fully automatic 5 step charger adjusts the charging voltage and current according to the state of charge and temperature of battery</li><li>Great for “off the grid” applications with its multi-step charging from alternators and solar panels</li><li>Can be connected directly to solar panels without the need for a regulator</li></ul></div><img src="http://ecx.images-amazon.com/images/I/4165Fo1Cq5L.jpg" noproxy>