In order to act as a power storage device, the electric car must be equipped with a bidirectional chargeable battery. These batteries can not only absorb power, but also return it if necessary. This requires a cable that is able to quickly transport large amounts of electricity. The Japanese, as well as Tesla, use the so-called CHAdeMO connection, which allows charging capacities of more than 50 kW. The charging stadium must therefore be equipped with a DC charger. In short: In addition to the electric car, all other components, such as the wallbox, charging cable and plug, must support smart grid technology. In Japan, Mitsubishi's electric vehicles are already successfully supplying households with electricity for washing machines, dryers and refrigerators. Mitsubishi is working to further perfect the system. For example, an external battery should act as an additional small charging unit between the battery of the electric car and the household power connection. In addition, it should be precisely controlled how much electricity remains in the electric car and how much may be consumed for the household.