Even if it would work technically, i would not want to use it as the battery would degenerate faster over time, making a replacement neccessary in a shorter time. Also, the cars internal system and BMS would have to be on the entire time, which consumes about 200 Watts of Power constantly, the car could never sleep during the night. Also, whenever you need to drive the car at night, your house would still need access to grid power if you want to avoid outages when no sun is on. But thats just my opinion on this. If it is useful for your purposes, go on, maybe Tesla will open this at some time in the future.
Where i live, the price €/kwh for electricity is quite low so for me a home battery anyways would have no advantage at the moment. I get 0,13€/kwh for feeding to grid and pay only 0,11€/kwh to buy it back from the grid (at least at night). When this changes, i might consider a PowerWall, but still do not want to use the vehicle for that. This also makes me rather feed the energy from the PV to the grid instead of charging the car with it. Currently i only charge at night from the grid, which is kinda weird but makes sense for me
Greetings Joe
