Dang! I had no idea there were so many options. But after a quick glance it appears most of them are not only not sold in the US, they don't support the US split phase electrical system. I guess I do remember some discussion on this but never paid attention to the details before.
And yes, I meant V2H not V2Grid. VTG is technically feasible and could work but the devil as usual is in the details, and the will to do it. It shouldn't be much different than grid-tied solar (during the day) except that the inverter input would be coming from a battery instead of a panel array.