27 Dec 2019


MAN Truck & Bus, VW Group and Verkehrsbetriebe Hamburg-Holstein (VHH) are working together to test how used batteries behave after initial use in vehicles and as a stationary energy storage system, under real-world operating conditions. For this both companies have set up a container with a total battery capacity of 500 kWh connected to the depot for charging the network.

The test involves 50 used vehicle batteries combined together to create one storage system. The joint project from MAN Truck & Bus, Verkehrsbetriebe Hamburg-Holstein (VHH) and the Volkswagen Group is being carried out in the Bergedorf quarter of Hamburg, at the VHH bus depot. A white container containing 50 batteries – which were previously installed in VW Passat GTE vehicles – is located here. Each battery has a nominal capacity of 9.9 kWh, meaning that the container has a total capacity of exactly 495 kWh – about half a megawatt. The batteries are mounted on racks and then interconnected via battery management to form a large battery. One objective of the project is to develop a flexible battery storage concept which allows for the replacement of batteries. Stefan Sahlmann, Head of MAN Transport Solutions says: "Battery second use is an extremely important topic in view of the ever-growing electrification of mobility as a whole. The project with VHH and Volkswagen is part of our strategy to make transportation of the future sustainable."

According to MAN Truck & Bus different scenarios are tested using the large storage system, in order to optimise power consumption at the VHH depot. This includes improved utilisation of the network and cushioning of peak loads when charging electric buses (peak shaving). The peak shaving method can reduce the storage system up to 600 kW of peak load. Additionally, the project partners anticipate new findings on the ageing behaviour of the batteries, on efficient battery management and on the life cycles of future battery technologies.

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