link to BAE Systems website
link to homepage

Series-E: Electric power and propulsion

Electric platform
  • Series hybrid propulsion system
  • Fully-electrified accessories
  • Engine Stop/Start technology
  • No infrastructure modifications
Proven results
  • Nearly 2,000 systems worldwide today
  • Achieving up to 15% engine-off time
  • Providing excellent fuel economy results

Our successful hybrid electric drive system is a series configuration, designed specifically for fuel savings and its pathway to electrification. BAE Systems provides propulsion for 35’-40’ buses, articulated, and double deck buses.

The series design is optimized for city bus duty cycles that typically have low average speeds and frequent stops. In this type of environment, series design provides better bus fuel economy and emission reductions than a parallel solution. Series-E enables the electrification of bus accessories and can be configured with Stop/Start, engine-off technology.

Propulsion systems are available based on vehicle weight

Electric accessories powered

Series-E components diagram
Series-E components

All of our transit products—Series-E, Series-ER, Series-EV, and Series-H—are able to electrically power bus accessories using our Accessory Power Systems (APS). We offer three Accessory Power Systems depending on your needs. Our systems are contained in one small package and supply electric power to accessories such as air conditioners, cooling fans, and air compressor pumps. These units function as an electronic alternator, completely replacing the conventional belt-driven alternator.

Our series hybrid system

Our series hybrid system
Our series hybrid system
  • No mechanical link between the diesel engine and the axle
  • All power comes from the electric motor
  • Power flows in series from engine to generator to traction motor
  • Adaptable to all electric

Complete integration & support

BAE Systems provides our customers with the most comprehensive power and propulsion systems integration and support in the industry. While others often just ship their system parts to prime bus manufacturers to install, we've sent a certified Application Engineer along with our cutting edge power systems to make sure they are integrated properly from day one, including on-site technical advice and thorough training. Then we back that work with our Flexible Service Plan – customized to fit the customer's business model – including a coordinated spares management program.

  • 35' - 40' North American buses; 12 - 18m European buses
  • 60' articulated buses
  • Double deck buses
City bus diagram and rendering
Articulated bus diagram and rendering
Double decker bus diagram and rendering