Genset trailer

AC Propulsion backtracking genset trailer

A genset trailer is a range extending device for use with battery electric vehicles consisting of an internal combustion engine and an electric generator (collectively called a genset). They run on traditional fuels such as gasoline or diesel and are sized to provide the continuous power requirements for the vehicle they are used with. Most small to midsized passenger vehicles would require 15 to 20 kW (20 to 27 hp) for unlimited freeway travel using fuel. Larger vehicles could require 30 kW (40 hp) or more of power depending on how heavy or un-aerodynamic they happen to be. This essentially converts an electric vehicle into a series-hybrid.

One such trailer was the AC Propulsion backtracking Long Ranger range extending gasoline-fueled trailer, making it a gasoline-electric series plug-in hybrid electric vehicle. This trailer used a 500 cc (31 cu in) Kawasaki engine with a 9.5 US gal (7.9 imp gal; 36 L) fuel tank and achieved 30 mpg-US (7.84 L/100 km) to 35 mpg-US (6.72 L/100 km) or 30 mpg-US (36 mpg-imp) to 35 mpg-US (42 mpg-imp). It was rated at 20 kW (27 hp) DC output and could maintain 60 to 80 mph (97 to 129 km/h).

The disadvantages of genset trailers are gaseous emissions from the engine, system maintenance, the additional cost of fuel, and storage when it is not in use on the road. Also, since it is a trailer, it is impractical for some motorists.

Advantages of a genset trailer include improved efficiency over a dedicated series hybrid when the trailer is disconnected for local travel, additional cargo space and a simpler and more cost effective basic vehicle. Similar to a series hybrid such a combined vehicle would require fewer batteries to achieve an effectively longer range.

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