I've probably spent way too much time trying to connect electric vehicle batteries to the grid. Over the last decace I have worked to discharge electric car and bus batteries. At Nissan, I led the first V2G project for the company globally and then powered the first concert (that I'm aware of) with a Vehicle to Load (V2L) setup. I moved to Mercedes-Benz to connect EV batteries to the grid without the wheels on with as stationary energy storage. Today, I work at Nuvve, a V2G aggregator, and have helped establish V2G school bus depots like this one. I advise a battery diagnostic startup called Rejoule. I break warranties working on V2H in my spare time.