DNAinaGoodWay
Posts: 240
Joined: Fri Sep 23, 2016 11:19 am
Location: Central Massachusetts

Re: Winter, hilltop reserve, and battery conditioning

Tue Oct 17, 2017 11:53 am

30 F this morning and no conditioning recorded. I used a good bit warming it up before I left, in the driveway, unplugged. IIRR, Bolt doesn't have a heat pump, just a power sucking resistance heater, so in a mild cold it'll use more power. Luckily there's lots to spare.
Leaf SL 2012-2014
Leaf SV 2014-2017
Bolt LT 2017-
6.72 kW Solar

MikeDabrowski2017
Posts: 51
Joined: Sat Aug 19, 2017 1:25 am
Location: North East Ct
Contact: Website

Re: Winter, hilltop reserve, and battery conditioning

Thu Oct 19, 2017 11:23 pm

Thanks for the real world experience positronic
Have not seen a miles/ kwh hit from the cold yet

No battery conditioning yet.

On a 38 degree morning I noticed what seemed to be a reduced max kwh into the motor and lower than normal acceleration rate?

Lithium Batterys gradually loose their high drain capabilities as they get cooler
Probably not good to hotrod when it's cold

MikeDabrowski2017
Posts: 51
Joined: Sat Aug 19, 2017 1:25 am
Location: North East Ct
Contact: Website

Re: Winter, hilltop reserve, and battery conditioning

Thu Nov 09, 2017 8:27 pm

Well it looks like we will learn about cold battery conditioning first hand
Friday night is supposed to get down to 13 f and Saturday night to 19 f
This morning it was 29 and I saw no battery conditioning ?
My evse datalogs each charge so it should clearly show if it needs conditioning and how much.
Wonder if the car will show conditioning if it comes from the grid?
Will leave it plugged in.

SeanNelson
Posts: 1286
Joined: Tue Jul 05, 2016 2:43 am
Location: Vancouver, BC

Re: Winter, hilltop reserve, and battery conditioning

Fri Nov 10, 2017 1:51 am

MikeDabrowski2017 wrote:Wonder if the car will show conditioning if it comes from the grid?
Will leave it plugged in.

The display page with percentage of energy used for battery conditioning is showing statistics "since the last full charge". I assume this means the stats won't start being measured until you unplug the car.

I've seen a few percentage points of battery conditioning with the car unplugged and the temperatures just a degree or two below freezing. Based on the percentage and the total kWh consumed it worked out to about 0.5 kWh used for conditioning.

blondejd
Posts: 3
Joined: Fri Nov 10, 2017 1:48 pm

Re: Winter, hilltop reserve, and battery conditioning

Fri Nov 10, 2017 2:12 pm

Just got my Bolt, and the weather almost immediately started to drop to near- or below freezing (I'm in Canada, Toronto area). Temperature dropped to 0C (32F) the other day, and without warming up the car before unplugging, I noticed a few percentage points of power used to condition the battery for the first part of my commute.

This morning, with temperatures dropping to an icy -10C (14F), I warmed it up for 15 minutes or so before unplugging, and there was no battery wasted on conditioning.

It did consume quite a bit more kWh on the way in compared to what I saw with warmer temperatures. Not sure how much of this is due to more cabin heating, and how much of it is due to a cold battery?

LeftieBiker
Posts: 792
Joined: Tue Jan 10, 2017 7:13 am

Re: Winter, hilltop reserve, and battery conditioning

Fri Nov 10, 2017 7:54 pm

The car uses resistance heat only, so most of the extra power used was from the heater.

MikeDabrowski2017
Posts: 51
Joined: Sat Aug 19, 2017 1:25 am
Location: North East Ct
Contact: Website

Re: Winter, hilltop reserve, and battery conditioning

Sun Nov 12, 2017 3:06 pm

Ok have some data points
At ambient of ~ 20 degrees f
Conditioning used ~ 1kwh/ 6 hours of sitting
http://99mpg.com/blog/finally-i-have-an ... hevy-bolt/
I expect it works the same when not plugged in
Not as bad as I had anticipated.
The in car energy graph showed no battery conditioning , so it seems that only shows conditioning when it comes from the battery.

DNAinaGoodWay
Posts: 240
Joined: Fri Sep 23, 2016 11:19 am
Location: Central Massachusetts

Re: Winter, hilltop reserve, and battery conditioning

Mon Nov 13, 2017 7:00 pm

From Friday to today mine used 4% on conditioning, not plugged in, at temperatures down to 15 F. That’s about 2.4 kWh or maybe 10 miles tops.
Leaf SL 2012-2014
Leaf SV 2014-2017
Bolt LT 2017-
6.72 kW Solar

MikeDabrowski2017
Posts: 51
Joined: Sat Aug 19, 2017 1:25 am
Location: North East Ct
Contact: Website

Re: Winter, hilltop reserve, and battery conditioning

Tue Nov 14, 2017 3:26 pm

The % of energy used for conditioning is a true % of energy used up to that point relative to total energy used to that point.

I unplugged the evse with the battery full to the hilltop reserve but not finished the conditioning


the circle graph indicated100% energy was battery conditioning and the driving % was 0
soon as I drove away and the driving %
Started to rise the conditioning part of the circle quickly dropped to zero

Another single conditioning was captured this morning
Evse showed .7 kWh consumed in the 30 minute event

GetOffYourGas
Posts: 1016
Joined: Tue Oct 20, 2015 5:25 pm
Location: Syracuse, NY

Re: Winter, hilltop reserve, and battery conditioning

Tue Nov 14, 2017 4:01 pm

I saw the battery conditioning this past weekend for the first time. It was 23F when I departed. The energy used (% to conditioning compared to the total energy) worked out to about 0.6kWh. It remained at 0.6kWh as I drove, implying that the car did not condition again. This despite being parked at a trail head in 30F weather for about 4 hours. I'm guessing the battery cools off very slowly.
~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

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