This system derives from the USA where it has been used in citybuses since 1998 (New York and other cities) and also on US military vehicles.
It uses (typically in the UK) a Cummins 4.5 litre engine that drives a generator which in turn drives the transmission axle. In addition there are storage batteries.
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The system consists of a generator, an electric motor, and an energy storage system. A diesel engine that turns the generator operates independent of the electric drive motor, allowing it to run at nearly consistent speed for optimum efficiency. The system uses no mechanical transmission, a major maintenance item on traditional diesel buses.
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Applied in the double-decker Enviro400 from Alexander Dennis, the BAE hybrid system uses a transverse configuration and features:-
*± 200 kW peak Li-ion battery pack with A123Systems cells;
*320 kW continuous propulsion control system
*120 kW (160 hp) continuous, 175 kW (235 hp peak) motor with 425 Nm continuous, 650 Nm for 4 minutes, 900 Nm peak;
*145 kW generator, including starter; and
*4.5-liter 185 hp ISBe Euro 4 engine with SCR.
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Apparently BAE just transfered this series hybrid technology from military trucks developed for US army. BAE is first and foremost a weapon systems company, not a green energy one.
There they use that truck (when stationary) as power generator for radars etc.
Additional benefit of series hybrid in military service is that it provides short range stealth mode.
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From:-
http://www.greencarcongress.com/2008...stems-int.html