I too have a time of day rate. What I did is switched the charging start time associated with the lower rates. After entering departure time for each day, I switched from "earliest possible" to "latest possible" (pg 127 of the 2017 owner's manual). Since my non-peak rate is from 11 PM to 9 AM weekdays and all day weekends, I set my departure time at 8 AM (could have been 9 AM, but you get the idea). It typically starts at 5:30 or 6 AM and is done charging by 8, so it's not usually charging when I'm asleep, plus I understand it's when the battery approaches full charge that it's more critical. I limit the charge will hilltop reserve (90% target later models), and I set a text reminder when the vehicle is finished charging via my Onstar app. It's like clockwork though; at 8 AM, I unplug the car after it's done charging.Great. I called my electric utility company and switched to time-of-use metering within months of buying my Bolt in 2019, which means I ONLY charge overnight. Now what do I do? This warning from GM does not fill me with confidence.
Question for a GM technical person. Sometimes, especially when I charge to 100%, the cooling fans are running on high soon after the charge is complete and the indicator light is solid green. When I unplug the charge station, the fans stop running. I understand this is associated with battery cell balancing, and bleeding off individual cells creates heat. Am I correct in unplugging before it can finish the balancing cycle with fans on high? Is this a hazard, or is it outweighed by having all the cells healthily balanced?