There's no payment infrastructure
V2G is only going to be accepted if the utility company pays a LOT for electricity so provided.
Nobody is going to buy electricity at 25-40c/kWh, store it in their car battery then sell it back at 4c/kWh. That would be insane!
Every charge/discharge cycle wears the cells a little, so even if you've got solar PV or wind on your property, you aren't going to store excess in your car to sell later at the same price. You'll sell it instantly at the 4c and save the battery life.
So the only way V2G can ever work is if EV car owners are paid a LOT for their storage. Probably at least double what they pay to charge the vehicle.
Which immediately raises serious questions about viability. I suspect it is not in fact viable at all.
Biting the hand that feeds IT
