COMPLETE SYSTEM TO EXTEND YOUR FISHING TIME! The new Charge Pro PLUS system combines a Guest charger with an alternator power module (VSR) to continuously charge the trolling motor or house battery while the engine is running. This one of-a-kind system allows energy which is normally wasted on a fully charged cranking (or starting) battery bank to be re-directed to the trolling motor or house battery bank - ensuring that all batteries are fully charged.