One of the big things of the "green" crowd is that EV batteries can be used as storage for absorbing excess solar/wind energy, and maybe even put it back into t

One of the big things of the "green" crowd is that EV batteries can be used as storage for absorbing excess solar/wind energy, and maybe even put it back into the grid. Basically the opposite of your suggestion. For solar, cars should be charged around noon. Overnight charging is ideal if we go nuclear. Now I am talking about global scale, on an individual scale, everyone does what's best for them. For example, if you have net metering, having solar panels and charging overnight makes a lot of sense. Having batteries at home and emptying your home battery into your car battery during the night can also make sense depending on what kind of contract you have with you utilities and the kind of subsidies you can pretend to. Anyways, most of the people I know (not in the US) with solar panels don't have energy storage, because they have net metering, or even better, they sometimes sell for more than they buy per kWh.