ILETRIC
Posts: 740
Joined: Sun Dec 19, 2010 9:36 pm
Delivery Date: 04 Jun 2011
Location: Marin County

Re: POST YOUR BATTERY DEGRADATION RESULTS

Tue Jun 25, 2013 4:23 pm

Or we just need better batt chemistries. Waiting for Li-Sulfur, Li-Air with double-triple density.

Then we need those batteries to be available for purchase to be applied into the Leafs by a new breed of electro auto mechanics. And then bye bye Nissan's dummy battery swap plan.

Future. It can't come fast enough.
------------------------------------------------
1st bar lost at 38,700 miles/22 months
2nd bar lost at 45,750 miles/27 months

Traded-in on 10-19-2014 at 56,150 miles
-------------> for Kia Soul EV+ <-------------

GregH
Posts: 860
Joined: Fri Jul 01, 2011 4:16 pm
Delivery Date: 13 Jun 2011
Leaf Number: 26967
Location: Irvine, CA

Re: POST YOUR BATTERY DEGRADATION RESULTS

Tue Jun 25, 2013 5:05 pm

tbleakne wrote:Ahr Capacity 57.88 (87.36%)
Above has declined about 1% (from 88.5%) since I got Elm a month ago.


You mean about 1.3%.. 57.88/(66.25*0.885) = 98.7%
'17 blue Volt Premier w/ACC
'12 SL black Leaf
'11 SL blue Leaf
RAV4-EV 2002-2005
Gen1 & Gen2 EV1 1997-2003
PV 2.4Kw, 10kWh lithium battery SCE TOU-DA

User avatar
drees
Moderator
Posts: 6221
Joined: Fri Apr 23, 2010 3:51 pm
Location: San Diego

Re: POST YOUR BATTERY DEGRADATION RESULTS

Tue Jun 25, 2013 10:49 pm

tbleakne wrote:I really wish Nissan would offer an active liquid cooling loop option. They could engineer the battery pack with the coolant channels in place, and these would be connected and filled with coolant if you bought the option.

It would be nice to be able to chill the pack to < 75F regardless of ambient temperature like cars with TMS do... In the mean time, you seem to be doing everything possible to keep your pack cool while keeping it garaged. I need to finish up the gable vent install in my garage to let in the cool night air. I might even add an exhaust fan to it to help move more air depending on how much airflow it helps generate. It's a 10F temp difference between the floor and ceiling when it warms up - I'm hoping convection is enough to bring the garage temps down.
'11 LEAF SL Powered By 3.24 kW Enphase Solar PV

tbleakne
Gold Member
Posts: 979
Joined: Wed Jul 28, 2010 12:05 pm
Delivery Date: 03 Jun 2011
Leaf Number: 2400
Location: Claremont, CA

Re: POST YOUR BATTERY DEGRADATION RESULTS

Sun Jun 30, 2013 1:59 pm

The heat wave is having a substantial impact.
Late PM, Morning
Ambient. 95-100., 68-72
Garage. 82-85. , 72-75
Battery. 88-93. , 79-82

Very modest driving in afternoons raises battery temperature 10+ deg F.
Maintaining differential between garage and ambient is costing 4-10 kWh per day. Trying to keep the battery somewhat cooler by cooling the whole garage is very inefficient, but it still is an interesting experiment. In a few weeks I should be able to see whether this cooling is helping mitigate capacity loss at all or not.
LEAF Ocean Blue SL, "100 % Electric" decals, Delivered June 3, 2011
Sold June 2014 27K miles, 18% capacity loss, 1 bar, 5.0 mi/kWh.
Solar 4.6 KW DC with both string and micro-inverters.

ELROY
Posts: 292
Joined: Sun Nov 04, 2012 10:36 pm
Delivery Date: 27 Oct 2012
Leaf Number: 023406
Location: Camarillo, CA

Re: POST YOUR BATTERY DEGRADATION RESULTS

Tue Jul 02, 2013 1:18 am

tbleakne wrote:The heat wave is having a substantial impact.
Late PM, Morning
Ambient. 95-100., 68-72
Garage. 82-85. , 72-75
Battery. 88-93. , 79-82

Very modest driving in afternoons raises battery temperature 10+ deg F.
Maintaining differential between garage and ambient is costing 4-10 kWh per day. Trying to keep the battery somewhat cooler by cooling the whole garage is very inefficient, but it still is an interesting experiment. In a few weeks I should be able to see whether this cooling is helping mitigate capacity loss at all or not.


Interesting stuff. Yesterday I completed a 200 mile trip. Used the DCQC for the first time. In fact, I visited 3 different DCQC stations, and one Level 2 station to make the 200 mile trip. Battery temps reached around 109F, and pretty much stayed there for a while. I can definitely confirm it takes forever to cool off! Driving through Woodland hills approached 110F ambient temps. Made sure I didn't stop to charge there! Too bad they did have a hose fitting, where you could just hook up your garden hose to cool off the pack when it is heat saturated. At 109F pack temp, the temp gauge read 7 bars. What are the battery temps others have approached? Is 7 bars, really typical, as far as it being far from the max readings on the temp gauge bars? When it was all said and done, I seemed to have lost over 1% capacity yesterday, even after the battery cooled off. There really seems to have been this downhill spiral with capacity. It usually goes down, and rarely goes up for any significant period of time. I was at 96% capacity just the other month. Now I am at 91%. Will post details of my trip, and all my battery readouts before and after each charge session, during my trek.

LEAFfan
Posts: 4828
Joined: Fri Apr 23, 2010 6:08 pm
Delivery Date: 08 Jun 2011
Leaf Number: 1855
Location: Phoenix Area

Re: POST YOUR BATTERY DEGRADATION RESULTS

Tue Jul 02, 2013 3:21 am

ELROY wrote:
tbleakne wrote:The heat wave is having a substantial impact.
Late PM, Morning
Ambient. 95-100., 68-72
Garage. 82-85. , 72-75
Battery. 88-93. , 79-82

Very modest driving in afternoons raises battery temperature 10+ deg F.
Maintaining differential between garage and ambient is costing 4-10 kWh per day. Trying to keep the battery somewhat cooler by cooling the whole garage is very inefficient, but it still is an interesting experiment. In a few weeks I should be able to see whether this cooling is helping mitigate capacity loss at all or not.




Interesting stuff. Yesterday I completed a 200 mile trip. Used the DCQC for the first time. In fact, I visited 3 different DCQC stations, and one Level 2 station to make the 200 mile trip. Battery temps reached around 109F, and pretty much stayed there for a while. I can definitely confirm it takes forever to cool off! Driving through Woodland hills approached 110F ambient temps. Made sure I didn't stop to charge there! Too bad they did have a hose fitting, where you could just hook up your garden hose to cool off the pack when it is heat saturated. At 109F pack temp, the temp gauge read 7 bars. What are the battery temps others have approached? Is 7 bars, really typical, as far as it being far from the max readings on the temp gauge bars? When it was all said and done, I seemed to have lost over 1% capacity yesterday, even after the battery cooled off. There really seems to have been this downhill spiral with capacity. It usually goes down, and rarely goes up for any significant period of time. I was at 96% capacity just the other month. Now I am at 91%. Will post details of my trip, and all my battery readouts before and after each charge session, during my trek.


Was that 109F pack temp your highest sensor? Now I KNOW the 2013s' battery packs are a lot different! At 95.9F (highest sensor) triggers the 7th bar and 103.5F trips the 8th. When I had 9 TBs, the highest TS was 112F.
2013 LEAF SV Del. 2/28/13
2013 LEAF World Record for Most Miles Driven On One Charge-188 miles/8.8 m/kW h
4.8 kW DC PV ($ .91/W fully installed)/ Dec., 2010

GregH
Posts: 860
Joined: Fri Jul 01, 2011 4:16 pm
Delivery Date: 13 Jun 2011
Leaf Number: 26967
Location: Irvine, CA

Re: POST YOUR BATTERY DEGRADATION RESULTS

Tue Jul 02, 2013 7:03 am

LEAFfan wrote:
ELROY wrote:
tbleakne wrote:The heat wave is having a substantial impact.
Late PM, Morning
Ambient. 95-100., 68-72
Garage. 82-85. , 72-75
Battery. 88-93. , 79-82

Very modest driving in afternoons raises battery temperature 10+ deg F.
Maintaining differential between garage and ambient is costing 4-10 kWh per day. Trying to keep the battery somewhat cooler by cooling the whole garage is very inefficient, but it still is an interesting experiment. In a few weeks I should be able to see whether this cooling is helping mitigate capacity loss at all or not.




Interesting stuff. Yesterday I completed a 200 mile trip. Used the DCQC for the first time. In fact, I visited 3 different DCQC stations, and one Level 2 station to make the 200 mile trip. Battery temps reached around 109F, and pretty much stayed there for a while. I can definitely confirm it takes forever to cool off! Driving through Woodland hills approached 110F ambient temps. Made sure I didn't stop to charge there! Too bad they did have a hose fitting, where you could just hook up your garden hose to cool off the pack when it is heat saturated. At 109F pack temp, the temp gauge read 7 bars. What are the battery temps others have approached? Is 7 bars, really typical, as far as it being far from the max readings on the temp gauge bars? When it was all said and done, I seemed to have lost over 1% capacity yesterday, even after the battery cooled off. There really seems to have been this downhill spiral with capacity. It usually goes down, and rarely goes up for any significant period of time. I was at 96% capacity just the other month. Now I am at 91%. Will post details of my trip, and all my battery readouts before and after each charge session, during my trek.


Was that 109F pack temp your highest sensor? Now I KNOW the 2013s' battery packs are a lot different! At 95.9F (highest sensor) triggers the 7th bar and 103.5F trips the 8th. When I had 9 TBs, the highest TS was 112F.


I flirted with 37.0C (98.6F) yesterday on my max temp and never saw the 7th TB (2012 SL 94% health)
'17 blue Volt Premier w/ACC
'12 SL black Leaf
'11 SL blue Leaf
RAV4-EV 2002-2005
Gen1 & Gen2 EV1 1997-2003
PV 2.4Kw, 10kWh lithium battery SCE TOU-DA

ILETRIC
Posts: 740
Joined: Sun Dec 19, 2010 9:36 pm
Delivery Date: 04 Jun 2011
Location: Marin County

Re: POST YOUR BATTERY DEGRADATION RESULTS

Tue Jul 02, 2013 7:18 pm

Right now the Leafs are suffering everywhere you look. :roll:
------------------------------------------------
1st bar lost at 38,700 miles/22 months
2nd bar lost at 45,750 miles/27 months

Traded-in on 10-19-2014 at 56,150 miles
-------------> for Kia Soul EV+ <-------------

MarvGordon
Posts: 38
Joined: Tue Mar 05, 2013 1:13 pm
Delivery Date: 15 Mar 2013
Leaf Number: 403176
Location: Buffalo, MN

Re: POST YOUR BATTERY DEGRADATION RESULTS

Fri Jul 12, 2013 7:36 pm

2013 SL delivered 3/15. ~7400 miles. Charged to 100%...sit 4 hours...charge to 100% Plug in ELM.....

Ahr=67.36
CAP= 101.67
SOC=96.7
23.4kWh
293 gids

User avatar
TomT
Posts: 10607
Joined: Sun Aug 08, 2010 12:09 pm
Delivery Date: 01 Mar 2011
Leaf Number: 000360
Location: California, now Georgia
Contact: Website

Re: POST YOUR BATTERY DEGRADATION RESULTS

Sat Jul 13, 2013 8:31 am

That doesn't necessarily mean the packs are any different, just that they changed the temperature gauge or sensor calibration... Or that the data that is coming back from the 2013s is different and not indicating the temperature we think it is... The 2013 service manual should have the answer to gauge calibration...

LEAFfan wrote:Was that 109F pack temp your highest sensor? Now I KNOW the 2013s' battery packs are a lot different! At 95.9F (highest sensor) triggers the 7th bar and 103.5F trips the 8th. When I had 9 TBs, the highest TS was 112F.
59,991 miles/12 bars/289 Gids/68.54 AHr/101% SOH/101.64% Hx 7May15 w/ new Lizard (barely made the warranty).
71,770 miles/12 bars/256 Gids/59.04 AHr/88% SOH/87.92% Hx 3Mar16 at lease return.

Now driving a 2016 Volt Premier.

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