This is done for a soccer stadium in Amsterdam.
https://www.johancruijffarena.nl/default-showon-page/amsterd...
https://www.johancruijffarena.nl/default-showon-page/amsterd...
So we can use them in the car to charge when there is excess renewables, and then use the second-life batteries in large stationary storage installations to do the same. Tying into the different grid systems is a bit of a nightmare with everyone having their own standards unfortunately, otherwise it would be easier to roll these out more often.
(I am speaking for myself, not Mobility House).