An energy harvesting device for a transport vehicle comprising an electric converter circuit and a power take-off unit is disclosed. The electric converter circuit comprises: an electric energy storage; a first DC bus; an electric generator connected to the first DC bus through an electronic brake controller; a second DC bus connected to the first DC bus through a DC/DC converter, and an inverter connected to the second DC bus and having an output connected to the electrical load of the energy harvesting device. The power take-off unit comprises: a rotatable pivot plate for coupling to the vehicle chassis and supporting the electric generator; an electric generator pulley coupled to the electric generator; a shaft pulley; a shaft attachment for attaching the shaft pulley to the vehicle driveline shaft; and a belt connecting the electric generator pulley and the shaft pulley.