Still's RX70 hybrid diesel forklift

Still GmbH's plans to start production of the RX70 series hybrid diesel forklift have been put on hold pending lower super-capacitor prices.

The hybrid forklift based on the RX70 diesel forklift has two energy storage systems. Besides the tank for diesel fuel, the forklift is equipped with super-capacitors which are charged with the energy released when the forklift brakes. During acceleration, power from the capacitors boosts the forklift's performance. The diesel engine generates additional electric current with a three-phase generator for the electric drive motor.

Still sales promotion officer Juergen Wrusch says the price of the capacitors is still "too high".

"We expect lower prices for super-capacitors in the next few years. The target date [for series production] depends on the super-capacitors' price development and the acceptance of the higher price," he says.

The RX70 hybrid forklift was awarded the UK Fork Lift Truck Association's environmental award for 2008. It is ideal for use in applications where the forklifts have frequent acceleration and stop cycles like the loading of lorries in the beverage industry. During the loading process, up to 11% of diesel can be saved using the hybrid forklift, Wrusch says.