Yes. 9PM-6AM is free. I charge both my cars, turn on the washer/dishwasher, run the pool, and crank the AC down to 68F at 9PM. During the day, it's 12.9 cents per kWh. When I calculate in all the taxes and fees, I get ~5-6 cents per kWh, for the month.
If I can offset the daytime load...