Maxwell Technologies Inc. has received purchase orders worth approximately $13.5 million from three of China’s leading transit bus producers for BOOSTCAP ultracapacitor modules to support braking energy recuperation and torque assist functions in diesel-electric hybrid transit buses.

David Schramm, president and CEO, said that deliveries of the company’s 48-volt BMOD0165 P048 modules, which are assembled by one of its contract manufacturers in China, already have begun and will continue through the balance of the year.

Maxwell’s sales and applications engineering teams have been working with heavy vehicle OEMs in China for the past two years. The company estimates that more than 150 hybrid buses with BOOSTCAP ultracapacitor-based energy storage systems already are in service, and that number is expected to grow to nearly 1,000 by year-end.