Danl
Posts: 68
Joined: Sun Mar 06, 2016 3:29 pm
Delivery Date: 04 Mar 2016
Leaf Number: 404384
Location: Vancouver, Wa

Cabin Air Cooling the Battery

Wed Jul 20, 2016 3:43 pm

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

If this is true, I am amazed that someone has not found it before in order to cool the battery and therefore prolong its life.

What I did was to turn on the AC set at 73degF with the fan running full. It is set to outside air input and then I rolled all the windows up. I did this with an L2 charge happening at the same time.

First I checked Leafspy. 4kw going into the charger. 2.5kw going into the battery. so we have 1.5kw going into the AC. After 15 minutes or so, the AC power drops to about 0.75kw. Also I see T1 is the lowest temp. Without AC T1 is normally the highest.

Then look for warm and cool airflow around the car.
The radiator fans are running. Hot air is blowing out over the front tires.
The cabin blower is running. it is sucking air in at the bottom of the windshield.
The cool air exhausting from the cabin appears to be coming out around the battery shield.

I have data logging going on LeafSpy so later I will chart the temps and see if the battery is being cooled.

This is important Because this gives us a tool to cool the battery during charging and therefore increase the life of the battery.

Has anyone else seen this?
Am I crazy, or has this been available but Nissan has not given us instructions on how to improve the battery life?

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

Wed Jul 20, 2016 5:28 pm

I take it this would only work with the "fresh air" setting and not "recirculate" setting? You can get right into the battery from the safety disconnect fuse in the center, I've often though about running a tub down into it to force cool air into the battery compartment. :)

Danl
Posts: 68
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

Wed Jul 20, 2016 6:25 pm

knightmb wrote:I take it this would only work with the "fresh air" setting and not "recirculate" setting? You can get right into the battery from the safety disconnect fuse in the center, I've often though about running a tub down into it to force cool air into the battery compartment. :)

Hello Knightmb,
Yes, you are correct. Run in Fresh air mode all the time. Then turn on the cabin fan while charging.

No, you do not need to run a tube, the Leaf is already plumbed for the cabin air to exhaust into the battery area.

Thanks,
Dan
2013 SilverLeaf, bought used with 25200 miles

LeftieBiker
Posts: 6940
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: Cabin Air Cooling the Battery

Wed Jul 20, 2016 7:05 pm

It might explain why some cars do much better than others in similar situations and locations. I *always* use the A/C if it's Hot, and while it's often on Recirculate, when I switch to Fresh (which do regularly while driving) that would blow extra chilly air down around the battery cases...
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

Danl
Posts: 68
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

Wed Jul 20, 2016 7:13 pm

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
2013 SilverLeaf, bought used with 25200 miles

Danl
Posts: 68
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

Wed Jul 20, 2016 7:18 pm

LeftieBiker wrote:It might explain why some cars do much better than others in similar situations and locations. I *always* use the A/C if it's Hot, and while it's often on Recirculate, when I switch to Fresh (which do regularly while driving) that would blow extra chilly air down around the battery cases...


Yes, I would advise never run in Recirculate. The cool exhausted cabin air is of more value to cool the battery than the cost to cool down new air coming into the cabin.

In addition I would advise running the cabin fan with the windows up even when the AC is not needed.

Thanks,
Dan
2013 SilverLeaf, bought used with 25200 miles

LeftieBiker
Posts: 6940
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: Cabin Air Cooling the Battery

Wed Jul 20, 2016 7:36 pm

Yes, I would advise never run in Recirculate. The cool exhausted cabin air is of more value to cool the battery than the cost to cool down new air coming into the cabin.

In addition I would advise running the cabin fan with the windows up even when the AC is not needed.



I use Recirculate to block exhaust fumes more than as an energy saver. I still have 12 bars and 89% SOH, and my lease is ending in the next 12 months, so I'll keep up what I'm doing. If this info proves true, it will help those who regularly avoid A/C use to extend range, to reconsider.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

Danl
Posts: 68
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

Wed Jul 20, 2016 8:23 pm

LeftieBiker wrote: I use Recirculate to block exhaust fumes more than as an energy saver. I still have 12 bars and 89% SOH, and my lease is ending in the next 12 months, so I'll keep up what I'm doing. If this info proves true, it will help those who regularly avoid A/C use to extend range, to reconsider.


Yes, I use Recirculate when I get on a gravel road and then turn it off when the dust clears.
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

Thu Jul 21, 2016 9:36 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

Now that is fascinating for sure! I can actually run some data logging on LeafSpy because my Charger Connection and Office Window are right next to each other. So I can run LeafSpy from my Phone inside the office (bluetooth link can reach just far enough for LeafSpy). I'll see if I can get the same result. :mrgreen:

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Stanton
Forum Supporter
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Re: Cabin Air Cooling the Battery

Thu Jul 21, 2016 10:44 am

You are full of surprises @Danl! I don't remember this phenomena being discussed much way back, but there's one thing I would like to see (with all of your data actually): hotter ambient temps (like 100 degrees). If this method can drive a 7TB event to a 6TB event (or even lower), that would be a big benefit to the battery pack.
2011 Blue Ocean SV w/floor mats & window tint
12v LiFePO4 battery & FIAMM 74100 horns
Wet Okole seat covers (front)
Tor's low-power heater mod
2013 sun visor
3G modem upgrade
L2 EVSE Upgrade
Battery Pack replaced (Rev E) @51 months and 41k miles

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