Bi Directional charging is slowly becoming available, as used electric cars become very cheap – adding this feature will enable a lot of cars to suddenly be very useful earning money every day. Imagine spending 15k on car and equipment and that setup makes you 2k a year, that’s 13% yield. Its almost better than starting your own business (for the average man). Something to actively investigate. Used electric car prices are too low and hoping for a correction in the next 18 months.
BTW: Chademo supports this already is much easier (ish) to aquire the necessary equipment to convert your car into a bidirectional charger
Below are some notes:
https://github.com/dalathegreat/Battery-Emulator/wiki#supported-inverters-list