DaveinOlyWA
Posts: 15049
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 16 Nov 2019
Leaf Number: 319862
Location: Olympia, WA
Contact: Website

Re: Reset Capacity Bars

Sat Oct 29, 2016 9:03 am

SurfHawk wrote:I used Leaf Spy to buy a 12 bar 2013 a month ago. SOH was 91% and AHR was 59, so I bought it. Now a month later im 87% SOH and 56 AHR. Not sure what's going on, but I didn't think it was reset based on AHR.
not reset. its just you. your driving habits can easily sway the numbers +/- 2-3 ahr

http://daveinolywa.blogspot.com/2016/05 ... 36000.html

http://daveinolywa.blogspot.com/2014/09 ... stats.html

http://daveinolywa.blogspot.com/2014/10 ... t-two.html
2011 SL; 44,598 mi, 87% SOH. 2013 S; 44,840 mi, 91% SOH. 2016 S30; 29,413 mi, 99% SOH. 2018 S; 25,185 mi, SOH 92.23%. 2019 S Plus; 13,705 mi, 93.41% SOH
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

DaveinOlyWA
Posts: 15049
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 16 Nov 2019
Leaf Number: 319862
Location: Olympia, WA
Contact: Website

Re: Reset Capacity Bars

Sat Oct 29, 2016 9:13 am

AntronX wrote:
baustin wrote:The charge cycle has to completely finish for the cells to be balanced...
I keep seeing this posted here, and it does not make sense. Look at first leafspy page. All those red lines are cells being bled off via balancing resistors in BMS. It happens all the time, regardless of the SOC. I think you are perpetuating the myth that you need to charge to full in order for balancing to occur.
balancing happens all the time but there is a benefit to top end balancing and that is more range.

The issue we have is that even slight amount of overcharging will degrade your cells MUCH faster so the charging profile insures that does not happen but cutting off charging when the fullest cell hits a certain voltage. in a perfect world, all the cells would be at that same voltage but no... not happening. Some will get left behind. this is why the charge cycle will kick back on for 3-4 short charge cycles after the main charging has been completed.

there is also a factor on the discharge curve because Li likes to give its all until its nearly exhausted which means SOC tends to fall off a cliff at a certain point. this means weaker cells get weaker at a faster rate. This explains why voltage delta is so small when SOC is high but grows considerably as SOC drops

so what happens when you to top end balance? You will have the cells that fell behind will potentially continue to fall behind. they won't get that far behind because they will be in a perpetual state of 24/7 trickle charge. (ok not quite that bad!) so is this bad? not really if

1) you don't spend a lot of time at real low SOC (if you are then you need to tell me why you are not charging to full...)
2) you don't need that extra few miles of range

so top end balancing is important... if you need it.
2011 SL; 44,598 mi, 87% SOH. 2013 S; 44,840 mi, 91% SOH. 2016 S30; 29,413 mi, 99% SOH. 2018 S; 25,185 mi, SOH 92.23%. 2019 S Plus; 13,705 mi, 93.41% SOH
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

SurfHawk
Posts: 83
Joined: Thu Sep 22, 2016 1:43 pm
Delivery Date: 04 Oct 2016
Location: Santa Barbara

Re: Reset Capacity Bars

Sat Oct 29, 2016 1:00 pm

Thanks for directing me to your blog posts, Dave. Super helpful. I think I shouldn't look at AHR daily as it will drive me crazy. Hopefully my driving/charging habits have it at this number and it won't get worse
2013 Leaf S - Purchased 10/2016
4kW Solar - Installed 11/2016

DaveinOlyWA
Posts: 15049
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 16 Nov 2019
Leaf Number: 319862
Location: Olympia, WA
Contact: Website

Re: Reset Capacity Bars

Sat Oct 29, 2016 3:26 pm

SurfHawk wrote:Thanks for directing me to your blog posts, Dave. Super helpful. I think I shouldn't look at AHR daily as it will drive me crazy. Hopefully my driving/charging habits have it at this number and it won't get worse
TY TY
well thinking daily fluctuations matter will drive you crazy. As you probably read, I had my batt stats in the 57 ahr 87% Hx range was still able to bring both up to near 100% by changing driving/charging habits. I record my stats daily but only really look at the numbers on a monthly basis.

I am over 44,000 on a 45,000 mile lease so soon will have a new set of numbers to play with if I stick with Nissan and will be going stir crazy with wonder if I dont! :shock:
2011 SL; 44,598 mi, 87% SOH. 2013 S; 44,840 mi, 91% SOH. 2016 S30; 29,413 mi, 99% SOH. 2018 S; 25,185 mi, SOH 92.23%. 2019 S Plus; 13,705 mi, 93.41% SOH
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

cwerdna
Posts: 11136
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: Reset Capacity Bars

Sat Oct 29, 2016 7:49 pm

SurfHawk wrote:Thanks for directing me to your blog posts, Dave. Super helpful. I think I shouldn't look at AHR daily as it will drive me crazy. Hopefully my driving/charging habits have it at this number and it won't get worse
Keep us posted.

If you could answer my questions at http://www.mynissanleaf.com/viewtopic.p ... 32#p473832, that would help us in better guessing whether you were a reset victim, or not.

A big red flag is if the vehicle previously had resided in a hot climate.

'19 Bolt Premier
'13 Leaf SV w/premium (owned)
'13 Leaf SV w/QC + LED & premium (lease over)

Please don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

SurfHawk
Posts: 83
Joined: Thu Sep 22, 2016 1:43 pm
Delivery Date: 04 Oct 2016
Location: Santa Barbara

Re: Reset Capacity Bars

Sat Oct 29, 2016 9:35 pm

Build month was 4/13. The former owner bought it in Santa Monica and lived in Malibu, two coastal climates I'd expect to average in the mid 70s. I bought it from an independent dealer in Tarzana who got it at auction the week before.
2013 Leaf S - Purchased 10/2016
4kW Solar - Installed 11/2016

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RegGuheert
Posts: 6419
Joined: Mon Mar 19, 2012 4:12 am
Delivery Date: 16 Mar 2012
Leaf Number: 5926
Location: Northern VA

Re: Reset Capacity Bars

Mon Oct 31, 2016 4:45 am

SurfHawk wrote:Build month was 4/13. The former owner bought it in Santa Monica and lived in Malibu, two coastal climates I'd expect to average in the mid 70s. I bought it from an independent dealer in Tarzana who got it at auction the week before.
I think part (most?) of what you are seeing is due to degradation that occurred while the car sat on car lots. Unfortunately, the BMS cannot know about this degradation until the car is driven and charged for a while. As a result, your first LeafSpy measurement likely recorded the capacity of the battery as it was when the original owner sold it while what you are measuring now is closer to what it ACTUALLY had when you purchased it.
RegGuheert
2011 Leaf SL Demo vehicle
10K mi. on 041413; 20K mi. (55.7Ah) on 080714; 30K mi. (52.0Ah) on 123015; 40K mi. (49.8Ah) on 020817; 50K mi. (47.2Ah) on 120717; 60K mi. (43.66Ah) on 091918.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

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JimSouCal
Posts: 860
Joined: Tue Feb 08, 2011 12:54 pm

Re: Reset Capacity Bars

Mon Oct 31, 2016 8:25 am

RegGuheert wrote:
SurfHawk wrote:Build month was 4/13. The former owner bought it in Santa Monica and lived in Malibu, two coastal climates I'd expect to average in the mid 70s. I bought it from an independent dealer in Tarzana who got it at auction the week before.
I think part (most?) of what you are seeing is due to degradation that occurred while the car sat on car lots. Unfortunately, the BMS cannot know about this degradation until the car is driven and charged for a while. As a result, your first LeafSpy measurement likely recorded the capacity of the battery as it was when the original owner sold it while what you are measuring now is closer to what it ACTUALLY had when you purchased it.
While not great news, seems a very logical explanation...

SurfHawk
Posts: 83
Joined: Thu Sep 22, 2016 1:43 pm
Delivery Date: 04 Oct 2016
Location: Santa Barbara

Re: Reset Capacity Bars

Mon Oct 31, 2016 9:05 am

Does seem logical. It has stabilized around 57Ahr and 87% SOH so maybe that's what happened. The previous owner's paperwork was in glove box, he bought late May of 2013, and if he turned it in May of 2016, so it could have been sitting around for 4 months before being auctioned. I guess if you are in the market to buy an off-lease 2013, try to get one as close as possible to 3 years old so it might be fresh off lease.
2013 Leaf S - Purchased 10/2016
4kW Solar - Installed 11/2016

cwerdna
Posts: 11136
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: Reset Capacity Bars

Fri Nov 18, 2016 1:05 am

SurfHawk wrote:Does seem logical. It has stabilized around 57Ahr and 87% SOH so maybe that's what happened.
Out of curiosity, is it still at about this level or has it gotten significantly worse?

I posted some of my stats earlier at http://www.mynissanleaf.com/viewtopic.p ... 32#p473832, but as of tonight, mine have improved from ~3 weeks ago.

Readings of my car taken a few hours ago are:
AHr: 57.60
SOH: 88%
Hx: 86.78%
odo: 39,507 miles

'19 Bolt Premier
'13 Leaf SV w/premium (owned)
'13 Leaf SV w/QC + LED & premium (lease over)

Please don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

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