Enova Systems (AMEX: ENA) a supplier of Hybrid Electric powered systems, has ordered Saphion® phosphate batteries from Valence Technology, Inc. (NASDAQ: VLNC). Enova Systems, in collaboration with IC Corporation, the nation’s largest school bus manufacturer, recently won a bid with Advanced Energy, a Raleigh, N.C.-based nonprofit corporation, to provide up to 21 hybrid school buses to 11 states. The hybrid school bus is expected to attain a 100 percent increase in fuel efficiency, which becomes even more essential with rising fuel costs affecting the school districts.
The hybrid drive system recovers kinetic energy during regenerative braking; charging the batteries while the bus is slowing down. This ability to charge the batteries provides additional power for acceleration, making school busses ideal candidates for hybrid technology because of the frequent stops and starts they perform along their daily routes.
“We selected Valence’s Saphion® phosphate batteries for their inherent safety, which addresses the limitations of traditional lithium-ion chemistries particularly in large batteries like those needed for hybrid vehicles,” said John Dexter, Director of Operations and Planning, Enova Systems. “In addition to safety, Saphion technology delivers the power and energy that these buses demand.”
The hybrid school bus project features Enova’s post transmission 80-kilowatt hybrid drive system coupled with Valence’s U-Charge Power System. The system is based on a parallel architecture, allowing the system to utilize both diesel and electric power in a highly efficient manner.
The U-Charge Power System uses Valence’s patented Saphion® phosphate lithium-ion technology which provides long run-time, exceptional cycle life, and safety. Saphion technology combines the power of lithium-ion with the safety of phosphates, a combination that is powerful yet chemically and thermally stable.
The U-Charge XP Power System U24 model is a 12.8-volt nominal battery designed in the BCI Group 24 size and operates at standard 12-volt lead-acid voltage ranges. This battery is capable of delivering 1500 watts continuous through a full discharge cycle and can handle peak loads up to 3800 watts. The U-Charge XP Power System can charge in less than two hours and power is stored at a high charge efficiency. Each U24 model includes integrated battery monitoring electronics and is used in conjunction with a U-BMS or application specific battery management system. As many as 30 of the U-Charge XP Power System batteries can be connected in a series for high voltage applications such as pure electric vehicles, hybrid electric vehicles, marine applications, and power back-up applications