“f only a few homes got EV’s, then we’re not talking about much storage for grid use anyway. So the discussion is moot.”
I don’t own an EV. My cars suit idle most days. Trading electricity between prime and night time rates could net me several hundred dollars a month if I owned two EV’s
If you wanted to do that you could get an inverter and battery storage without an EV. You could charge your battery stack at night from the grid. During the day use power from the batteries instead of the grid. Then in the last hour or so of the peak rate period you could sell whatever's left in your battery storage to the grid (as long as the grid buyback rate during the day is higher than the cheap nighttime rate you pay).