At the end of a shift, all forklift trucks are driven back to their charging stations and their batteries are charged at the same time. This leads to increased energy consumption - especially at the start of the charging process - which can result in expensive peak currents. Should this occur on a regular basis, consumption will exceed the annual quota agreed with the energy supplier. Expensive supplementary payments due to the additional consumption and supply costs will surely follow. Many companies respond by disconnecting production machines or even entire warehouses and production areas from the grid and shutting them down when peak currents occur. Disruptions to the company's entire operations can thus be traced to the simultaneous peak current consumption of the battery charging systems.