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You appear to be talking about alternating current bidirectional charging. There is no standard for that (and none in development that I am aware of). Also, I a

You appear to be talking about alternating current bidirectional charging. There is no standard for that (and none in development that I am aware of). Also, I am not aware of any vehicle that has the onboard inverter that would be necessary (except possibly, the F150). Existing bidirectional chargers are direct current chargers. Basically, they connect directly to the car's battery and communicate with the car's battery management system. This is the same way that rapid chargers work. The main cost is the bi-directional inverter/rectifier, but that cost will come down.

londons_explore 5y ago
Correct - there is no standard for AC bidirectional charging. But someone could write one, and lots of existing cars could support it with a firmware update. Cars onboard chargers tend to use synchronous rectification[1], which means the power can flow the other way if software wants it to. Most DC rapid chargers could likewise support it, although again it would require new firmware to be written for the car (to not abort when it sees current flowing outwards), and new firmware for the charger. If you disassemble a car or charger, the thickest traces are the power path. If there are no diodes in the power path, then its likely the charger uses synchronous rectification and could support vehicle to grid with just firmware changes. [1]: https://en.wikipedia.org/wiki/Active_rectification https://en.wikipedia.org/wiki/Active_rectification