Abstract: An adapter apparatus has an interface for detecting internal vehicle operation data containing factors which report driving habits according to lifestyle, and an interface for detecting details related to the fluctuation of energy prices. The adapter apparatus further has a device for detecting and planning requirements, the device being configured for deducing an energy requirement profile using the vehicle operation data and for producing a future requirement plan based on at least one of the named factors. The device further being suitable for deducing the duration and frequency of vehicle down times by incorporating the requirement plan and having a charging optimizing device which is configured for comparing the vehicle down times with the energy price fluctuation. Details for producing a vehicle charging plan which is optimized for time and/or price and is based on the results of the comparison.