Has anyone checked out Ossiaco (https://www.ossiaco.com/) system for using your car for battery backup. After 6 PG&E shutdowns I checked into getting a powerwall but the cost was going to be around $18,500. I was told I needed 2 powerwalls which was $13,000 of the total cost. Since our cars have much larger batteries it seems to make since for their use for backup power. I know Tesla had a system to allow the original roadster to be used for battery backup. It appears that the Ossiaco system looks promising.