MrDRMorgan wrote: ↑
Mon Jan 20, 2020 11:22 am
Great information. Thanks! You confirmed why I did not see any battery heating while remote starting. It was not cold enough. Just to be clear, you say the battery heater will not go on until the battery temperature drops below 36 deg. F (2C). Do I understand that correctly?
That is correct 35.6F to be exact. It appears all the temperature set points are programmed in the car to be Celsius not Fahrenheit as these are the exact readings in Torque Pro and the conversion to Celsius is always to the exact degree with no decimals. I will leave my car unplugged tonight since it is supposed to get down to 25F again and I will check the battery temperature in the morning to see if it uses any of the battery energy to keep it above freezing while parked and unplugged. I'll also plug it in a couple hours before leaving to see what happens after being plugged in (i.e. if it immediately starts heating the battery.)
Yesterday when leaving work my battery temperature was reading 4C (39.2F). I turned the heat on so the car would be warm when I picked up my son. I was only able to achieve about 3.3 mi/kwh with the battery cold. When I got home the battery temperature was still reading 4c (39.2F) after driving about 8 miles.
This morning I did 2 preconditioning cycles on the car. When I began the battery temperature read 35.6F (2C) with the outside air temperature 25F (Charged to DIC [Display In Console reading from Torque] 82.3%.) After that first cycle the battery temperature was at 55.4F (13C) (Charge dropped to DIC 75.6%) Doing the second preconditioning cycle did not turn on the battery heater and the battery stayed at 55.4F (13C) (Charge dropped to DIC 73.7%.) This should give everyone an idea of when to precondition the car for better efficiency. Although I would preheat it whenever you want to for comfort. As a side note the heated seat was very hot this morning (cloth seats.)
Just as a point of reference our Gen 2 Volt when it was fully charged and before starting a preconditioning cycle the battery was already warmed to 55.4F (13C) .
All charging info that I have been doing is with a 120V 8 amp EVSE.