LeftieBiker
Posts: 7686
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: battery heater and days subzero parking

Fri Jan 05, 2018 11:03 pm

arnis wrote:9 temperature bars very "temporarily" is absolutely fine. Don't worry.
Just don't do this every week for years.


We don't actually know this. It may cause smaller amounts of damage that only add up to a substantial amount over time.
2013 "Brilliant Silver" SV with Premium and no QC, a 2009 Vectrix VX-1 W/18 Leaf modules, and 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

arnis
Posts: 762
Joined: Sat Jan 23, 2016 3:21 pm
Delivery Date: 23 Jul 2014
Leaf Number: 015896
Location: Estonia, Europe

Re: battery heater and days subzero parking

Sun Jan 07, 2018 3:11 pm

Exactly. There is no need to worry about battery degrading of "few days" in "that one day it got to 9 bars for few hours".
aka battery degraded for 5 days in 1 hour, or smth like that.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

Dooglas
Posts: 182
Joined: Thu Apr 03, 2014 10:08 pm
Delivery Date: 04 Jan 2017
Leaf Number: 314779
Location: Oregon City, OR

Re: battery heater and days subzero parking

Tue Jan 16, 2018 6:40 pm

Levenkay wrote:Hitting 9 temperature bars (about 5 bars of "rise") during a multiple-QC journey from Bellingham to Portland in mid-40 degree F weather. I haven't bothered to chase down exact numbers, but isn't that about a 50 or 60 degree difference between the pack and a highway-speed airflow? I have to believe that even a modest forced-circulation liquid heat exchange system would get the heat out with way less temperature drop, and still let the pack stay insulated in cold environments (just don't run the circulation pump in that case).

This is sure hard for me to understand. I have driven a Leaf as my primary vehicle in the Pacific NW for the past 5 years, including numerous trips on I-5. I don't recall ever seeing above 6 temperature bars. With air temperatures in the mid-40s, it is difficult to comprehend why passive cooling while underway wouldn't do any cooling job that needed to be done.
2013 Leaf SV - lease ended, 2016 Leaf S30

LeftieBiker
Posts: 7686
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: battery heater and days subzero parking

Tue Jan 16, 2018 7:50 pm

This is sure hard for me to understand. I have driven a Leaf as my primary vehicle in the Pacific NW for the past 5 years, including numerous trips on I-5. I don't recall ever seeing above 6 temperature bars. With air temperatures in the mid-40s, it is difficult to comprehend why passive cooling while underway wouldn't do any cooling job that needed to be done.


Low speeds and/or short driving times. The pack has a lot of mass compared to the passive cooling's ability to move heat.
2013 "Brilliant Silver" SV with Premium and no QC, a 2009 Vectrix VX-1 W/18 Leaf modules, and 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

Dooglas
Posts: 182
Joined: Thu Apr 03, 2014 10:08 pm
Delivery Date: 04 Jan 2017
Leaf Number: 314779
Location: Oregon City, OR

Re: battery heater and days subzero parking

Thu Jan 18, 2018 10:06 am

LeftieBiker wrote:Low speeds and/or short driving times. The pack has a lot of mass compared to the passive cooling's ability to move heat.

Yes, I understand that passive cooling will not be as efficient at low speeds or when the vehicle is parked. A drive between Bellingham and Portland would not, however, involve short driving times and typically would be conducted at speeds of 50-70 mph with the possible exception of congestion around Seattle or Tacoma. And all this at air temperatures in the mid-40s?
2013 Leaf SV - lease ended, 2016 Leaf S30

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