General Dynamics C4 Systems (Taunton, MA), a business unit of General Dynamics Corp. (Falls Church, VA), has delivered a first-of-its-kind, fuel cell-based auxiliary power unit (APU) to SunLine Transit Agency for installation aboard "The 21st Century Truck," a government- industry collaborative effort for development of commercially viable technologies that will dramatically cut the fuel use and emissions of commercial trucks and buses.
As configured for the 21st Century Truck, the 5kW power unit will act as a battery charger to electrify the air conditioning and other driver utilities in the concept Class 8 tractor when it is parked, avoiding the noise, emissions and expense of running the vehicle's engine for electrical power. The advanced fuel cell APU system is mounted behind the experimental truck's cab and provides a continuous charge to a 42Vdc battery system to power the environmental control unit and other engine loads.
