Quote:
Originally Posted by redpoint5
I don't understand why charging speed would be limited if it does heat the battery... I know Tesla's will preheat as you near a charging destination you've told it to navigate to.
Can you confirm the heater runs when the car is off while DCFC?
I figured the need for L2 in extreme cold was that the heater only ran when the contactors were closed, which is what happens when L2 charging.
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Bolts do not have the option to precondition on the way to the charger.
I did another DC charge today. Starting battery SOC 20% and temp 58F. The charger (150 kW) started the charge at 21 kW. The battery heater went to max (2 kW) and the battery coolant pump to 95%. It stayed at 21 kW until the battery temp hit 75F and then the charge rate started to slowly ramp up. At 80F it hit 25 kW and kept climbing while the battery heater started to ramp down. (It looks like 80F is the target battery charge temp). Max charge rate I saw before my phone stopped recording was 31 kW at 37 SOC%. I let it charge for 2 hours and the SOC went from 20% to 95% in that time.
So GM is throttling charge speed at lower battery temps and the car will run the battery heater when plugged into a DC charger.