If you ever are looking to implement that EV battery as house backup, this repo might be useful: https://github.com/dalathegreat/Battery-Emulator
I did mine with it and old leaf 24kwh battery (~60k km). After all the safety margins I get ~15 kwh out of the battery.
Sorry, the consequences are too dire for me to delegate household battery control to a vibe-coded project.
I'm curious what your home insurance provider has to say about your installation.