Stoaty
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Re: Temperature Bar data collection

Sat Jun 15, 2013 10:09 pm

LEAFfan wrote:Another interesting observation today: The car sat in the garage for 6 hours today with the garage being 100-104F during those six hours. The highest TS was 93 and the other two around 92.4. I'm wondering what the '11-'12's highest TS would be at those ambient temps for six hours?
In order to make a determination, would have to know what pack temperatures were before the Leaf sat in the garage.
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LEAFfan
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Re: Temperature Bar data collection

Sat Jun 15, 2013 10:33 pm

Stoaty wrote:
LEAFfan wrote:Another interesting observation today: The car sat in the garage for 6 hours today with the garage being 100-104F during those six hours. The highest TS was 93 and the other two around 92.4. I'm wondering what the '11-'12's highest TS would be at those ambient temps for six hours?
In order to make a determination, would have to know what pack temperatures were before the Leaf sat in the garage.
When I pulled in late morning, the highest TS was 92F. The garage reached 100F around 1:30PM then was 104F at 7:30PM.
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Stoaty
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Re: Temperature Bar data collection

Sun Jun 16, 2013 6:50 am

LEAFfan wrote:
Stoaty wrote:
LEAFfan wrote:Another interesting observation today: The car sat in the garage for 6 hours today with the garage being 100-104F during those six hours. The highest TS was 93 and the other two around 92.4. I'm wondering what the '11-'12's highest TS would be at those ambient temps for six hours?
In order to make a determination, would have to know what pack temperatures were before the Leaf sat in the garage.
When I pulled in late morning, the highest TS was 92F. The garage reached 100F around 1:30PM then was 104F at 7:30PM.
Without doing calculations, that certainly sounds a lot slower equilibration to ambient than my Leaf. I wonder if Nissan added more insulation to smooth out the peaks. The way to test that would be to see if the rate of cooling when ambient temp is at least 10 degrees lower than the battery pack temp is equally slow.
2011 Leaf with 62,000 miles given to Nephew
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LEAFfan
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Re: Temperature Bar data collection

Sun Jun 16, 2013 7:09 pm

It happened again: As soon as the highest TS reached 95.9F, I watched the TBs move from 6 to 7. This time it was the #1 sensor. The other two TSs (#4,#2) were about .4F lower.
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DaveEV
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Re: Temperature Bar data collection

Mon Jun 17, 2013 8:28 am

Stoaty wrote:
LEAFfan wrote:When I pulled in late morning, the highest TS was 92F. The garage reached 100F around 1:30PM then was 104F at 7:30PM.
Without doing calculations, that certainly sounds a lot slower equilibration to ambient than my Leaf. I wonder if Nissan added more insulation to smooth out the peaks. The way to test that would be to see if the rate of cooling when ambient temp is at least 10 degrees lower than the battery pack temp is equally slow.
It seems more likely that LEAFfan's car is reading temperatures low for some reason. It seems highly unlikely that a battery pack stored and operated in 100F+ ambient temperatures would stay well below that temperature.

The coolest my pack has been is around 71-72F - a few degrees above my garage temperature with ambient temperatures in the 70-80F range. Driving the car with the pack around ambient quickly rises pack temps up a few degrees.

Some of the highest 5TB readings I've seen:
77.8 78.2 76.0 75.8

GregH
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Re: Temperature Bar data collection

Mon Jun 17, 2013 8:32 am

On the drive to work this morning I was watching the max temp creep up...
24.5, 24.6, 24.7, 24.8, 24.9...

Sure enough as soon as it hit 25 degrees the 6th bar popped on.
the exact temps at that time were
T1=25.0
T2=24.9
T3=24.4
T4=23.8
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LEAFfan
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Re: Temperature Bar data collection

Mon Jun 17, 2013 4:23 pm

drees wrote:
Stoaty wrote:
LEAFfan wrote:When I pulled in late morning, the highest TS was 92F. The garage reached 100F around 1:30PM then was 104F at 7:30PM.
Without doing calculations, that certainly sounds a lot slower equilibration to ambient than my Leaf. I wonder if Nissan added more insulation to smooth out the peaks. The way to test that would be to see if the rate of cooling when ambient temp is at least 10 degrees lower than the battery pack temp is equally slow.
It seems more likely that LEAFfan's car is reading temperatures low for some reason. It seems highly unlikely that a battery pack stored and operated in 100F+ ambient temperatures would stay well below that temperature.

The coolest my pack has been is around 71-72F - a few degrees above my garage temperature with ambient temperatures in the 70-80F range. Driving the car with the pack around ambient quickly rises pack temps up a few degrees.

Some of the highest 5TB readings I've seen:
77.8 78.2 76.0 75.8
Yeah, it's starting to get exciting. Whatever Nissan did (the chem tweaking) to the 2013 pack seems to be working as far as keeping the temps lower. Maybe the 'vents' help keep it cooler when just sitting and your theory about having lower resistance is probably helping too. It will be even more exciting if these packs don't degrade as fast or as much as the '11-'12s. So no one with an '11-'12 has seen battery temps lower than ambient? Mine is always lower even in the hundred degree temps here. And our garage reaches 100 degrees around 1PM and stays there for at least 7 hours, but the pack still stays below garage temp. Right now, the garage is 102F and has been between 100 and 102 for four and a half hours with my highest TS at 92F.
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LEAFer
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Re: Temperature Bar data collection

Mon Jun 17, 2013 5:07 pm

I can't explain it, but take a look at http://www.mynissanleaf.com/viewtopic.p ... 3&start=30" onclick="window.open(this.href);return false;
There's very little variation in temperatures reported by the sensors. The P3227 could have had something to do with it ??

I delivered the LEAF with 6TBs showing. After the car wash and return to me it was 5TBs. That didn't last very long though ... half-way home (after less than 10 miles) I noticed it at 6TBs again.
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06Jun2013 Status [28.5 months][34,173 miles][11 bars]
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dgpcolorado
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Re: Temperature Bar data collection

Thu Jun 20, 2013 8:49 am

GregH wrote:On the drive to work this morning I was watching the max temp creep up...
24.5, 24.6, 24.7, 24.8, 24.9...

Sure enough as soon as it hit 25 degrees the 6th bar popped on.
the exact temps at that time were
T1=25.0
T2=24.9
T3=24.4
T4=23.8
Yesterday I noticed that the sixth bar had come on and the max temp was 24.9º. What was interesting was that this morning the temp was about 26º (six temp bars, of course) after charging and started falling as I drove (due to cool ambient temperatures). By the time I got to my destination the highest temp was 24.3º but the sixth bar was still on. That has me wondering whether the threshold for turning a temp bar on is the same as for turning it off?
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Stoaty
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Re: Temperature Bar data collection

Thu Jun 20, 2013 9:26 am

Just saw the 6th temperature bar turn on today at maximum temperature of 79.5 degrees F. Didn't have the Leaf Battery App on (used LeafDD), so didn't have access to other temperatures. For me, it still seems to be the minimum battery temp getting over a certain threshold (around 77 degrees F.) that triggers the change from 5 to 6 TB.
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2013 Tesla Model S85 with 251 miles rated range at full charge
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