Ok, but a solar inverter powers your house without a transfer switch. But of course it switches off itself if the Net voltage drops to zero, probably for same reason. But still no modifications or breakers are needed for that, it's all included in the inverter box.
So if your battery send current back to the grid, only through a standalone breaker switch, with switches off in case of power goes down it would be fine correct?
If only I can tell the car to send power out, in same way as current V2L cable is doing (probably with some CAN-bus communication programming) then it could work or not?
Please take no offense but.. from reading your posts, I would suggest to go back and do more reading on topics like solar inverters, battery backup systems, US electrical grid in general, and so on. You're stringing terms together but are lacking the deeper understanding of the terms you're using.
J1772 signaling is quite simple and not related to CAN - as I stated elsewhere you can trick it with just a handful of resistors.
See:
https://en.wikipedia.org/wiki/SAE_J1772#Signaling
A switch that flips in case the grid goes down is called... an automatic transfer switch. Manual versions indeed also exist. These are purpose built devices that ensure that the home will be "islanded" and completely isolated from the grid when necessary.
Solar inverters exist in "grid-tied" and "off-grid" versions. Grid-tied inverters are simpler and *require* the grid to be online to provide a few things - most importantly but not all, a reference 60Hz/120v signal, and an infinite energy sink. They literally by design cannot operate without these things. If you attempted to trick a grid-tied solar inverter by feeding it a 120v 60hz signal (say from a generator) - you will indeed get it to back feed power into your generator.
What happens next?
Well your solar power has to go somewhere, and there's nothing consuming it, quickly leading to a voltage spike. If you're lucky, the inverter simply shuts itself off as it detects this condition. If you're unlucky, your generator (and inverter probably) releases the magic smoke.
Off-grid inverters are more expensive (because/and) they have electronics that allow them to operate completely independently of the grid. Typically, this also includes functions to manage battery backup charging, anti-islanding protections, aforementioned frequency and voltage
More reading:
https://en.wikipedia.org/wiki/Grid-tie_inverter
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Bringing this all back to reality. The Lucid Air + RangeXchange adapter already puts out 240v/40A AC power. The inverting is done inside the car.
This power is in a "format" that's ready to use by your home electrical system.
Here's all you need to build (or buy) to make it work:
- A 240v/40A rated manual or automatic transfer switch which speaks the J1772 signaling protocol.