if we need 1Gw base load power from wind then at a capacity factor of 33% and a 100% storage efficiency then 3Gw of wind power is needed so the 1Gw is supplied to the grid while 2Gw goes to storage. When the wind is not blowing 66% of the time power comes from storage to supply the grid. This means on a 3 day cycle day 1 the wind is blowing day 2 &amp; 3 it is not. but on day 4 if the wind is not blowing then there is no power at all. If storage comes from car batteries then you do not have power to drive home or to work. meaning the size of the battery for the car needs to be a lot larger then it needs to be. So when you drive home you can not power the grid. The cost of the car  would be a lot higher because of the needed extra storage. So one would be better off haveing a fixed  battery storage building keep the cars light as possable. Otherwize you would have to let your car sit there supply the grid with power and have no power left to drive home. <br>Car battery storage to supply the grid <br>WILL NOT WORK. sorry.