Ditto what Wiztecy said. Summer temps would top out around 100F. When I would drive up the hill after work (1,000 ft elevation gain at freeway speeds), the ESS would be quite warm by the time I got home. At the time, I was limited to 24 amps charging current, 240 volts. I would plug the car in and start a Range mode charge for about 30 minutes or so, then stop it manually. That would cool the ESS down enough that the circulation pump would shut down, otherwise it would run all night. If it didn't stop the pump, I'd give it another 15 minutes of range charge. The A/C does cycle a few times during the cool-down, so I couldn't go just by ear for when to stop the charging. I also couldn't monitor the actual ESS temps, so observing the coolant pump shutting down after stopping the charge was my measure of success.
No idea if this was the best plan for ESS health, but this was my logic. My primary charging would occur at work each day. This would show that the charging ports were appreciated, and to give the ESS a cool-down during the day, vs letting it sit in the hot parking lot unpowered after the commute in from home (25 miles). That prevented it from needing an unattended cool-down without being powered. I don't think that actually occurred, but that was my concern at the time. Also, a full charge and cool ESS for the return trip up the hill in the hot afternoon would be easiest on the overall system. And charging at work was free, so no point finishing the charge at home.