Series hybrid is fully electric. 100 percent of the traction power is delivered electrically via a direct drive electric motor powering the wheels of the bus. On a hybrid bus, we use an engine and generator to provide some of this power but the same drive-line components can be used to provide fully electric propulsion without the need for an engine.
We are actively working on fully electric vehicles (EV) with a number of city bus manufacturers in Europe and North America. We believe flexibility is a key driver in the transport requirements of modern cities. Full EV battery buses offer an important solution, but they require significant charging infrastructure investment, and they need scheduled down-time to charge their large batteries. While these buses can be used on certain routes, some routes are not well suited to battery buses. In these scenarios, battery dominant and/or plug-in hybrid can be used to bridge the gap.