Comment by woda79

That is a great thought and there is a lot of research in using batteries of vehicles for grid stabilization as well as arbitrage trading.

The problem, however, is that a lot of plugged vehicles are required to guarantee a meaningful amount of firm power/energy capacity and owners typically do not want to sacrifice a lot of flexibility when they rent out their batteries to provide such services.

Furthermore, as you can see from the replies, many are scared about battery degradation. Because of this and due to the fact that reverse charging is not possible for most vehicles, this schemes are often restricted to delayed charging which further limits revenue potential.

However, using arrays of old car batteries as stationary batteries is a very viable idea that, in my estimation, will lead to a significant growth in installed BESS in a couple of years.