Don wrote: kinda doubt you would ever see a meaningful pattern evolve. Maybe a better question would be do you plug in to recharge immediately after driving the car, when the inverter charger is already heated up, or do you wait several hours and plug in when everything is cool? Do you recharge during the heat of the day with the car sitting out in the sun, or do you recharge overnight parked in a cooler garage? For the past 6 years since the cars were new, I've been trying (98% of the time) to never plug them in immediately after driving, more to let the battery pack which isn't water cooled come down to ambient temps before charging, thinking (hoping) I'm doing something to extend the life of the car
The inverter/charger is water cooled, isn't it? Shouldn't the cooling system be keeping the internal temps in an acceptable range?
You are probably right, but it might be interesting anyway. I'm trying to remember the liquid coolant flow pattern as it does pick up heat along the way. If I'm remembering right it comes back from the radiator to the charger/DC to DC then goes to the inverter and then the motor. If so, then the charger would get the coolest coolant. But it would still be significantly hotter overall right after driving. I'm very lucky that our cars are parked in a cooled garage (off topic, but it is cooled for free) so ambients in the garage top out in the high 70's F. No matter how hot it is outside, 102-ish pretty often in June. Like you I think, it makes sense to charge after a rest and everything cooling off especially the battery cells. It may not help at all, but we can be sure that it doesn't hurt! Ours almost always charge in the middle of the night with built in timers in the Siemens EVSE's. That's good for the utility company, the cars and us.