Vehicle to Grid

Under Vehicle to grid ( V2G to German: vehicle to the grid ) or vehicle injection refers to a concept for the storage and delivery of electric power from the mains power source in electric and hybrid cars. Unlike pure electric cars, the vehicles should not only draw power from the grid, but also feed back into times of high network load.

This power plants for the expensive peak load power dispensable, or at least to a lesser extent necessary and the primary and secondary load power plants could be operated more smoothly. With a similar function as V2G battery - storage power plants can be seen.

The technology was the end of 2007 with six vehicles over a period of half a year in a trial stage, the output of which is not documented. For an efficient application, however, a sufficiently high number of vehicles with electric saving and an even higher number of publicly available connection points is required, which are not available as of June 2011.

Operation and details

The idea is, inter alia, of Willet Kempton and his team touted at the University of Delaware and worked out. Studies show that can not be moved from the millions of cars in the industrialized countries, over 90 % even at peak times and therefore could be used as storage if they had correspondingly powerful batteries. In times of weak demand priced charged, it would support at peak load times as a readily available buffer the network. In particular, for those in power output of highly fluctuating wind power has such a concept an important base for further expansion. A law was adopted on 21 September 2009 at the U.S. State of Delaware became the first state in the world adopted the remuneration for energy fed back assures owners of electric vehicles, which corresponds to the time of day dependent current tariff. Thus, for the first time practically act as energy traders the vehicle owner with the necessary bi-directional electric meter by charging its batteries with cheap off-peak power and then discharges to consumption peaks. Also, the German Wind Energy Association in Germany Calls for the promotion of V2G in support of wind energy.

These considerations should not ignore the fact that most car batteries have a life dependent on the cycles you. For effective and efficient functioning of the V2G concept, the car owner must provide the network operator with the central control of the charging and discharging processes. In this case, the operation V2G tangent to the guarantee conditions of the manufacturers, V2G sets down the battery life.

However, solar batteries and battery storage power plants are used to compensate for variations in the power grid, which occur frequently through renewable energy sources. By sharply falling battery prices therefore considerations could spare to " Vehicle to Grid " policy.