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"Vehicle to grid" power transfer was a key selling point of AC Propulsion's system back as far as the early 2000s.

I actually asked them about prices back then but unfortunately they were far out of reach for a DIY conversion (I think they wanted ~$40k for a drive unit for a compact car). They're still around, though (https://acpropulsion.com/) and they provided the drivetrain for the Tesla Roadster.

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