EnigmaEV
Posts: 20
Joined: Mon May 07, 2018 9:52 am
Delivery Date: 31 Mar 2018
Leaf Number: 301349
Location: Saskatchewan, Canada

Re: The 40KWH Battery Topic

Sun Mar 10, 2019 1:26 pm

TexasLeaf wrote:2018 SL
Purchase date 17-MAR-18

SOH 93.93%
AHr 108.43
Hx 107.67%

Odo 14,550 miles
L2 charges 176
DC fast charges 164
Here are my current 2018 SL stats - purchased March 31, 2018

SOH 94.30%
AHr 108.86
Hx 121.46

Odo 13,601 miles
L2 charges 616 (by LeafSpy - likely closer to 200 in reality)
DC fast charges 1

We are finally starting to see some temperatures above freezing in our forecast after more than a month of -20 to -40C. I would have expected to see more of spread in SOH numbers from a frozen Canadian Leaf to a hot Texas Leaf. Based on this comparison it would seem ambient temperature may not be as big a factor in the 40 kWh battery.
2018 Leaf SL, 32,116 km, SOH - 93.77%, Hx - 115.62, AHr - 108.248

sptleaf
Posts: 20
Joined: Sun Feb 17, 2019 10:57 pm
Delivery Date: 18 Feb 2019
Location: San Diego

Re: The 40KWH Battery Topic

Sun Mar 10, 2019 5:17 pm

Interesting how they are both about 6% SOH loss per year. If it's a linear degradation of 6% SOH loss per year, would that mean a 4 bar drop in 6 years? In the past, has it been the 4th bar lost around 64% SOH? Who knows how they calculate the 4 bars now though?

LeftieBiker
Moderator
Posts: 12779
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: The 40KWH Battery Topic

Sun Mar 10, 2019 7:23 pm

It is likely that the first year isn't an indicator of subsequent annual drops. I hope not anyway: I'm on track for an 11% drop the first year.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

DaveinOlyWA
Posts: 14037
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 16 Feb 2018
Leaf Number: 314199
Location: Olympia, WA
Contact: Website

Re: The 40KWH Battery Topic

Mon Mar 11, 2019 6:28 am

Interesting is not a word I would use. I think the wide geographical differences and climates each is seeing and we all still have nearly the same degradation based loosely on time/mileage tells me that the BMS SW is not right.
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 deceased. 29,413 miles. 2018 S40; 15,000 miles, 478 GIDs, 37.0 kwh 109.81 Ahr , SOH 94.61, Hx 120.15
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

SageBrush
Posts: 4590
Joined: Sun Mar 06, 2011 2:28 am
Delivery Date: 13 Feb 2017
Location: NM

Re: The 40KWH Battery Topic

Mon Mar 11, 2019 7:04 am

DaveinOlyWA wrote:Interesting is not a word I would use. I think the wide geographical differences and climates each is seeing and we all still have nearly the same degradation based loosely on time/mileage tells me that the BMS SW is not right.
I would wonder the same if a large data set develops. We will be back to measuring kWh put into the pack from VLB to be sure.
2013 LEAF 'S' Model with QC & rear-view camera
Bought off-lease Jan 2017 from N. California
Two years in Colorado, now in NM
03/2018: 58 Ahr, 28k miles
11/2018: 56.16 Ahr, 30k miles
-----
2018 Tesla Model 3 LR, Delivered 6/2018

Astros
Posts: 100
Joined: Wed Oct 11, 2017 11:21 am
Delivery Date: 28 Apr 2018
Leaf Number: 310136
Location: Seattle, WA

Re: The 40KWH Battery Topic

Mon Mar 11, 2019 10:44 am

My stats, on a 2018 SV bought last April:

~13000 miles
43 L3
252 L2
AHr 109.92
SOH 95.22%
Hx 114.63%
Driven mostly in Western Washington.

I track the stats roughly once a week, and have seen almost all of the degradation happen over three sudden drops, spaced every ~90 days. One of those drops happened during a long trip in the summer, but another one happened over the course of a few hours on a cool evening with only a few miles driven around town.
2019 Deep Blue SL Plus

LeftieBiker
Moderator
Posts: 12779
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: The 40KWH Battery Topic

Mon Mar 11, 2019 12:13 pm

Astros wrote:My stats, on a 2018 SV bought last April:

~13000 miles
43 L3
252 L2
AHr 109.92
SOH 95.22%
Hx 114.63%
Driven mostly in Western Washington.

I track the stats roughly once a week, and have seen almost all of the degradation happen over three sudden drops, spaced every ~90 days. One of those drops happened during a long trip in the summer, but another one happened over the course of a few hours on a cool evening with only a few miles driven around town.
You may have the lowest degradation we've seen, by a small margin. 5% a year would be tolerable for me.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

Astros
Posts: 100
Joined: Wed Oct 11, 2017 11:21 am
Delivery Date: 28 Apr 2018
Leaf Number: 310136
Location: Seattle, WA

Re: The 40KWH Battery Topic

Mon Mar 11, 2019 2:40 pm

LeftieBiker wrote: You may have the lowest degradation we've seen, by a small margin. 5% a year would be tolerable for me.
It's the sudden drops every three months that worry me. Without them my degradation has been fit perfectly by a double-linear trend, losing 3aHr/10,000 miles for the first 6,000 miles, and less than 1aHr/10,000 miles after that. If that was all there was to it, I would have only 13% degradation after 8 years and 120,000 miles. If I include those drops, then it looks like I would have 30% degradation over those 8 years. However, I notice that the amplitude of the drops is decreasing each time: the first one was 2.25 aHr, the second 1.4 aHr, and the last one was 1.0 aHr. If they keep to the past pattern, I expect to see another drop this week or next, so we'll see if the amplitude really does keep decreasing.

One thing I should note is that we don't baby the battery. My wife primarily drives the car during the week, and she likes to have a full battery every morning, so we almost always charge to 100% in the evening. We also take our Leaf on long trips in the summer, and when we do we have to "quick" charge multiple times in a day. It is pretty frustrating to get only ~22kW from the second charge and ~18kW from the third or fourth! Given the substantial degradation just with time, and no apparent correlation between those fast charges and measurable degradation, I would really like to get the software fix for #rapidgate over here.
2019 Deep Blue SL Plus

LeftieBiker
Moderator
Posts: 12779
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: The 40KWH Battery Topic

Mon Mar 11, 2019 5:02 pm

I suspect that the QCs are the explanation for both the good stats and the odd drops. There is evidence, with past Leafs, that frequent QC sessions inflate the SOH. Those periodic drops may be the BMS suddenly "realizing" that it's been fooled by them...
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

DaveinOlyWA
Posts: 14037
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 16 Feb 2018
Leaf Number: 314199
Location: Olympia, WA
Contact: Website

Re: The 40KWH Battery Topic

Mon Mar 11, 2019 7:10 pm

Astros wrote:My stats, on a 2018 SV bought last April:

~13000 miles
43 L3
252 L2
AHr 109.92
SOH 95.22%
Hx 114.63%
Driven mostly in Western Washington.

I track the stats roughly once a week, and have seen almost all of the degradation happen over three sudden drops, spaced every ~90 days. One of those drops happened during a long trip in the summer, but another one happened over the course of a few hours on a cool evening with only a few miles driven around town.

Ok, guessing I know of you in another life but have you seen my blog? I did a rather extensive one year review and the last part on degradation you might find interesting. Pay close attention to the last chart when I charted my stats every 1000 miles. The first drop was only 58 days after delivery but only tells me when I car was built and first tested. It had 4 QCs on it when I picked it up.

https://daveinolywa.blogspot.com/2019/0 ... -leaf.html
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 deceased. 29,413 miles. 2018 S40; 15,000 miles, 478 GIDs, 37.0 kwh 109.81 Ahr , SOH 94.61, Hx 120.15
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

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