Bidirectional Charging During Grid Outages

David asked a great question on my solar battery system post: why buy a small battery just for emergencies when electric cars have a large battery you can also use for other things? [1] This would be great, and seems like the obvious way for it to work: when the grid goes down the panels can charge the car when it's sunny, and the car can power the house when it's not. Unfortunately as far as I can tell the only way I could do this today is with a Cybertruck, and other systems are a long way off. The basic problem is that while several manufacturers support having the car power your house when the grid is down ("V2H"), they generally treat it as a separate discharging-only mode. For example, the GM V2H Bundle documentation says "During a power outage, the GM Energy Home Hub safely disconnects your home from the local power grid and enables backup power to flow from the GM Energy Inverter throughout your home" and "Once power is restored, your GM EV will automatically end the discharge…