[elihu]

I don't think that makes sense given that you'd probably want a full battery in the morning to start your day, and night-time is when you'd want to draw from the battery (assuming solar becomes a much bigger component of grid power).

It's possible I suppose that cities and school districts could have busses that have more capacity than they strictly need, and so it makes sense to use any surplus capacity for grid storage (while maintaining a reasonable margin in case a bus has to make an unexpected trip because some other bus had a flat tire or something).