Now you can smart charge the house bank in your tow camper, boat in tow, or Sprinter van while driving down the road. DC Powered Smart Charger, perfect for smart charging your auxiliary battery bank in a Mercedes Sprinter or Ford Transit van, Doesn't have the limitations of a traditional relay. It correctly calculates the charging needs of the house bank and smart charges anytime the boat or van is started and goes into float voltage when the battery is full. Choose from 9 preset output charge profiles, or set your own with a user customizable profile. Loaded with features, optional remote displays available, please check out our website for additional information. Part # BB1230 has a 12v input at up to 30 amps and output is 12v at up to 30 amps. Simply connect in between a starting battery and house bank and any time the vehicle's alternator is running this smart charger will smart charge the output bank.