The 28SI is built for continuous heavy duty, offering higher output at increased efficiency, it also comes with Remote Sense as standard.Remote Sense provides highly accurate voltage readings and optimizes battery state-of-charge resulting in improved efficiency and overall battery life. It maintains 14 volts at the battery by increasing charging voltage at the alternator to compensate for voltage drops. Remote Sense Technology Improves Battery Charge Time by 50% and Can Decrease Battery Warranty Claims by 30%