@Wiggles good pick up. I was out by a factor of 1000. I should have double checked. But even if is not so compelling, it's still a technology that has the possibility to make a huge impact. EV storage is only going to increase.
There are V2G chargers on the market now, but it's illegal to connect them to your home outside SA.
There should be no impediment, particularly when state governments start talking about relying on home storage for grid stabilization.