"New hybrid buses can cost $250,000-$350,000, while retrofitting an existing bus with a hybrid system will cost $40,000-$50,000, according to Cathy Stephen, superintendent of Randolph Eastern Schools.
PCI's prototype passed an initial Indiana State Police inspection last week, company president Rob Lykins said.
The plan is to connect a hybrid electric system to a bus drive shaft. The system, purchased from Variable Torque Motors of Fort Wayne, includes an electric motor, a controller and an ultracapacitor, a unit that stores and transfers energy. The ultracapacitor works much like a car battery.
In this configuration, there is no battery, and no need to plug the bus in to a power source.
The system is designed for start and stop driving, and Lykins said as long as the bus runs around or below 35 mph, the electric motor is powering the bus.
Lykins estimates that the hybrid system will result in 25-35 percent reductions in fuel usage and emissions.
Additionally, the electric system should cut brake maintenance and replacement costs in half. That savings comes from regenerative braking. When the driver steps off the brake or off the gas, the kinetic energy from that move is stored and redirected to the ultracapacitor."