knightmb
Posts: 420
Joined: Mon Jan 12, 2015 7:41 pm
Delivery Date: 15 Sep 2013
Leaf Number: 414897
Location: Franklin, TN

Re: Cabin Air Cooling the Battery

Fri Jul 22, 2016 4:25 pm

Danl wrote:I Have a 2013. I am doing some experimenting with battery temperature and I think the cabin air exhausts down into the Battery area.

I've been meaning to ask, is there a way to test this? I thought about getting a smoker and just filling the cabin with some harmless smoke and blasting the fresh mode to see where it all comes out. :D

Danl
Posts: 69
Joined: Sun Mar 06, 2016 3:29 pm
Delivery Date: 04 Mar 2016
Leaf Number: 404384
Location: Vancouver, Wa

Re: Cabin Air Cooling the Battery

Fri Jul 22, 2016 4:36 pm

knightmb wrote:
Danl wrote:I Have a 2013. I am doing some experimenting with battery temperature and I think the cabin air exhausts down into the Battery area.

I've been meaning to ask, is there a way to test this? I thought about getting a smoker and just filling the cabin with some harmless smoke and blasting the fresh mode to see where it all comes out. :D

This was the reason I ran the AC in the first place. I have a hand held infrared temp meter. Between that and just feeling around under the car, it was obvious where the cool air was coming out.

Thanks,
Dan
2013 SilverLeaf, bought used with 25200 miles

knightmb
Posts: 420
Joined: Mon Jan 12, 2015 7:41 pm
Delivery Date: 15 Sep 2013
Leaf Number: 414897
Location: Franklin, TN

Re: Cabin Air Cooling the Battery

Sun Jul 24, 2016 12:22 pm

Danl wrote:
knightmb wrote:
Danl wrote:I Have a 2013. I am doing some experimenting with battery temperature and I think the cabin air exhausts down into the Battery area.

I've been meaning to ask, is there a way to test this? I thought about getting a smoker and just filling the cabin with some harmless smoke and blasting the fresh mode to see where it all comes out. :D

This was the reason I ran the AC in the first place. I have a hand held infrared temp meter. Between that and just feeling around under the car, it was obvious where the cool air was coming out.

Thanks,
Dan

Ok, where? :D

Image

LeftieBiker
Posts: 9387
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: Cabin Air Cooling the Battery

Sun Jul 24, 2016 2:03 pm

Remember, it's easy to draw on a photo if you import it into Windows Paint. You wouldn't expect that primitive little program to handle real photos, but it does.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

Lambtron
Posts: 63
Joined: Mon May 25, 2015 12:39 pm
Delivery Date: 05 Aug 2011
Leaf Number: 6977
Location: North Las Vegas, Nevada

Re: Cabin Air Cooling the Battery

Wed Jul 27, 2016 11:38 am

Danl wrote:Image

Here is todays data.
You see that during the last charge T3 stayed level and did not climb as it had done in the first charge of the day when the AC had not been on.

Thanks,
Dan


Unless I'm missing something it looks like only a 3 or 4 degree drop maximum. You're shoveling against the tide with a spoon. No advantage gained in the limited time the car is driven or charged.

Danl
Posts: 69
Joined: Sun Mar 06, 2016 3:29 pm
Delivery Date: 04 Mar 2016
Leaf Number: 404384
Location: Vancouver, Wa

Re: Cabin Air Cooling the Battery

Thu Jul 28, 2016 8:45 am

Lambtron wrote:
Unless I'm missing something it looks like only a 3 or 4 degree drop maximum. You're shoveling against the tide with a spoon. No advantage gained in the limited time the car is driven or charged.


Yes, it seems that way.

This 3-4 degF temp is about what you add with a 15 mile drive and charge. So much more than a Spoon but not near as much as what we would like. The key here is to continue taking data and experimenting to see if there is a process that would make a difference.

Thanks,
Dan
2013 SilverLeaf, bought used with 25200 miles

Jbechtold
Posts: 1
Joined: Wed Jul 05, 2017 12:03 pm
Delivery Date: 05 Jul 2017
Leaf Number: 416312

Re: Cabin Air Cooling the Battery

Wed Jul 05, 2017 12:21 pm

Aftrr reading all of this, I'm wondering if the heater is a heat pump. If so, perhaps running the heat, and letting it out the windows may flow the "waste cold" over the battery, similar to the a/c flowing waste heat over the battery.

Whatdo you think?

John B
15 Leaf SV, 15,000 MI,
Purchased new
still close to 100% capacity
NO QUICK CHARGER
13 Leaf SL 33,000 MI
Purchased 5/17
With QuickCharger
Down to 16 KW capacity

arnis
Posts: 900
Joined: Sat Jan 23, 2016 3:21 pm
Delivery Date: 23 Jul 2014
Leaf Number: 015896
Location: Estonia, Europe

Re: Cabin Air Cooling the Battery

Tue Jul 11, 2017 8:10 am

Outside fan itself is enough. Air quantity through the radiator is massive. Air temperature changes only few degrees.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

alkeng
Posts: 2
Joined: Sun Aug 20, 2017 5:39 am
Delivery Date: 20 Aug 2017

Re: Cabin Air Cooling the Battery

Sun Jun 17, 2018 5:37 am

I have a 2018 Leaf. I did a simple test using my level 2 garage charger. I did two normal charge sessions. The first with the cabin fan off, then again with the fan on intake at full speed the next time I needed to charge. Both were 4 hour sessions, The second charge was early in the morning when the ambient temperature was well below the starting battery temperature.

With the fan off the battery temperature (Leaf Spy pro) rose from 73.8 to 83.7 deg F. Up 9.9 Deg in 4 hours.
With the fan running full speed the temperature rose from 79.2 to 86.7 Deg F. Up 7.5 Deg in 4 ours.

There might be something to this!

This needs to be tested after a quick-charge on a log trip.

Al Klappenberger

arnis
Posts: 900
Joined: Sat Jan 23, 2016 3:21 pm
Delivery Date: 23 Jul 2014
Leaf Number: 015896
Location: Estonia, Europe

Re: Cabin Air Cooling the Battery

Sun Jul 29, 2018 1:01 pm

Today did a short chilldown after heavy trip. Battery was
37,7C, 36,3C, 33,7C, Sprayed some water through service hatch (rear seat) for 10 minutes. And 20 minutes later temperatures were:
36,6C, 34,5C, 31,2C. And ambient was 29C. So 2 degrees (in metric) within very short duration.
Water trick does work. Unfortunately, without preparation (piping above the pack) it is hard to get water onto
rear seat cellstack. Hose trick works but it cumbersome. Manual spray from back seat :lol:

Also measured wind speed OVER the pack while driving. Yes it is there. And also there is airflow when AC fans are active (1m/s).
Therefore they do help if vehicle is stationary and there is no wind outside. But AC load must be minimal. Either set HEAT on newer
vehicles with heatpump or set fans speed to minimum and recirculation on. This way outside air is hardly warmer than it should be.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

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