A mock-up of John Deere’s battery-powered tractor is on display in Paris this week. Called SESAM (Sustainable Energy Supply for Agricultural Machinery), the actual prototype of the European-developed tractor is believed to be working at a secret location in Europe. Based on a 6R chassis, the concept sees the standard diesel engine swapped for a battery pack. Producing 130kW of continuous power, the electricity is used to power an adapted and electrically-powered DirectDrive stepless transmission. Developing high torque at low speeds and a maximum output of around 400hp, in standard mode, one of two electric motors operates the drivetrain and the other is used for the pto and auxiliary systems. If required, both motors can be linked together to supply full power, either for driving on the road at from 3 to 50kph or for pto and hydraulic work. John Deere stresses it is still very much a concept, and that field tests with the prototype continue. One obstacle to a possible commercial launch concerns the battery pack, which incidentally has a similar weight to the diesel engine. Currently, one battery charge lasts for up to four operating hours in typical mixed mode operations, while charging time is about three hours. ‘We need more efficient batteries’ is the message, and the goal is to be able to do a full day’s operation.