GetOffYourGas
Posts: 1159
Joined: Tue Oct 20, 2015 5:25 pm
Location: Syracuse, NY

Re: Bolt Winter Range and Driving Experience

Mon Dec 04, 2017 6:57 pm

It would be odd if the TMS activation were determined by ambient air temp. It's the pack temp that matters to the car, and so it should be the pack temp that determines when the TMS comes on...


I think we all agree on this point. I am working under the assumption that the car's TMS works on the battery temperature, not the air temperature. We are unfortunately unable to know the temperature of the pack, since Chevy doesn't care to share that information (although you can be assured that the car measures it!). The ambient temperature does give a lower limit for pack temperate in the cold weather (TMS would only warm the pack at these temperatures).
~Brian

EV Fleet:
2011 Torqeedo Travel 1003 electric outboard on a 22' sailboat
2012 Leaf SV (traded for Bolt)
2015 C-Max Energi (302A package)
2017 Bolt Premier

SeanNelson
Posts: 1462
Joined: Tue Jul 05, 2016 2:43 am
Location: Vancouver, BC

Re: Bolt Winter Range and Driving Experience

Mon Dec 04, 2017 7:25 pm

LeftieBiker wrote:It would be odd if the TMS activation were determined by ambient air temp. It's the pack temp that matters to the car, and so it should be the pack temp that determines when the TMS comes on...

Sure, but when the car is just sitting the battery temp follows the air temp - it's just a question of how slowly it takes the battery to heat or cool.

Tetondoc
Posts: 25
Joined: Thu Mar 23, 2017 4:08 pm

Re: Bolt Winter Range and Driving Experience

Mon Dec 04, 2017 9:10 pm

I totally agree... battery conditioning is based on the battery pack temp, not the ambient temps. I keep my car overnight in a heated garage, so battery is likely 50-60 degrees when I leave my house. Probably warmer if I’ve been charging. But even after getting cold-soaked for >12 hours in ambient temps from 20-32 degrees I have only seen “1% battery conditioning” on the energy info screen a couple of times. We will see what happens when ambient temps get into negative teens, which is not uncommon in our area.

devbolt
Posts: 466
Joined: Wed Sep 28, 2016 2:17 am
Location: Bay Area, California.

Re: Bolt Winter Range and Driving Experience

Wed Dec 06, 2017 9:02 am

With a Bluetooth OBDII reader and the right software on a tablet, it is possible to read the battery’s temperature. I believe that you can even read that data while the car is off. The OBDII port always has power, and some devices on the CAN bus never go to sleep, especially if the car is plugged in to charge (even if not active).

d2170
Posts: 47
Joined: Fri Dec 02, 2016 7:53 pm

Re: Bolt Winter Range and Driving Experience

Wed Dec 06, 2017 8:14 pm

How come the OP only charged the car every 3 or 4 days? (To preserve the battery for longer life I presume) Why not charge the car to 80 or 85% each night instead?

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