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philaphonic
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Capacity bar disappears, then reappears

Sun Aug 19, 2012 9:08 am

FYI, I searched on "capacity reappear" and got nothing so I will assume no one has had this happen yet (life is too short to read through 300+ posts on the early capacity loss issue).

Yesterday morning, after charging to 100% overnight, with odometer at about 9450 miles and < 15 months of ownership, I saw what several others in hot climates have been seeing: the top capacity bar on the battery gauge was unlit. Yet after driving for a few miles, I looked down at the dash and saw it was back on! And it has stayed on, so far. :) Am I on the cusp? When I took the Leaf in for its 1 year service/battery check back in May, the battery got 5 stars and from then on I noticed the estimated max range on the guessometer was less optimistic than before,which I assumed was due to a software update. E.g., last August a 100% charge would result in a guess of about 115 mile range, and now it's guessing 98 miles. That's about right for a capacity bar loss, but not if the software is making a less wild guess.

I mostly charge using level 2, 5 nights a week at 80%, 2 nights a week to 100%.

Reporting from Houston,
Phil A. Phonic
Phil A. Phonic
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Stoaty
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Re: Capacity bar disappears, then reappears

Sun Aug 19, 2012 9:19 am

I believe there was one similar report, but I am not able to find it (yet). Probably means you are about to lose a capacity bar. Let us know when it happens, report to Nissan and get a case number, and provide info for the Wiki:

wiki/index.php?title=Real_World_Battery_Capacity_Loss

Edit: Found it: viewtopic.php?f=30&t=8802&p=221281&hilit=+capacity+bar#p221281

Reported by leiko49 on 8/16/12.

SierraQ wrote:
EdmondLeaf wrote:
leiko49 wrote:I observed two days ago, while I was driving, during my first mile on my journey to work, I lost a bar (first one), was down to 11 bars, and then it returned about a mile later, and I currently have 12 bars.

Is this common?

I have 9K miles on my Leaf.

This happened to RickS from Phoenix he got back 12 battery capacity bar for short time, but after few weeks bar gone for good. Can you provide more details where you located and where car is parked day and night. Thank you


Interesting. I wonder how the capacity gauge makes its calculations?
  • It seems to be based on readings from some set of sensors which may not be consistently calibrated--one of the Leafs taken for testing in Arizona was re-calibrated and bars came back.
  • Possibly can be reset although reports of such may just be due to calibration corrections.
  • Bars can come and go as reported above. So it is not based on some aging algorithm that decays but rather live analysis.

There has been speculation that bars may come back when the weather cools in a month or two. However, the capacity meter seems to offset for cold temperatures otherwise some of us would have seen temporary drops in winter. So I don't think the meter measures absolute, instantaneous capacity. Perhaps then it projects capacity in ideal conditions, which means it is making some estimates. (A Leaf gauge that makes estimates? How shocking!) If that is true then likely we will not see any bars come back when the weather cools.
Last edited by Stoaty on Sun Aug 19, 2012 9:39 am, edited 1 time in total.
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edatoakrun
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Re: Capacity bar disappears, then reappears

Sun Aug 19, 2012 9:36 am

Stoaty wrote:I believe there was one similar report, but I am not able to find it (yet). Probably means you are about to lose a capacity bar. Let us know when it happens, report to Nissan and get a case number, and provide info for the Wiki:

wiki/index.php?title=Real_World_Battery_Capacity_Loss


The only report I am aware of of bars coming back, and staying for some time, is By TickTock, who's LEAF came back from testing with two bars "restored".

For discussion of what this may mean, see:

1 gid *mostly* equals 80Wh

viewtopic.php?f=44&t=9689

TickTock's spreadsheet of his battery history is here:

https://docs.google.com/spreadsheet/ccc ... li=1#gid=3
no condition is permanent

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philaphonic
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Re: Capacity bar disappears, then reappears

Sun Aug 19, 2012 9:57 am


Thanks Stoaty! And the graph you did on that page is very interesting, too. I would fall near the lower end in terms of miles driven per month, and it seems I will soon be able to put a data point on it that fits the trend nicely. Sigh.
Phil A. Phonic
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Stoaty
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Re: Capacity bar disappears, then reappears

Sun Aug 19, 2012 10:06 am

philaphonic wrote:Thanks Stoaty! And the graph you did on that page is very interesting, too. I would fall near the lower end in terms of miles driven per month, and it seems I will soon be able to put a data point on it that fits the trend nicely. Sigh.

Sorry to hear the news, and sorry to have to break the additional news that you won't even be able to put a data point on that graph--the analysis is confined to Phoenix metro area to make sure that cars were exposed to very similar temperatures. :(
2011 Leaf with 62,000 miles given to Nephew
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DaveinOlyWA
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Re: Capacity bar disappears, then reappears

Sun Aug 19, 2012 10:25 am

philaphonic wrote:FYI, I searched on "capacity reappear" and got nothing so I will assume no one has had this happen yet (life is too short to read through 300+ posts on the early capacity loss issue).

Yesterday morning, after charging to 100% overnight, with odometer at about 9450 miles and < 15 months of ownership, I saw what several others in hot climates have been seeing: the top capacity bar on the battery gauge was unlit. Yet after driving for a few miles, I looked down at the dash and saw it was back on! And it has stayed on, so far. :) Am I on the cusp? When I took the Leaf in for its 1 year service/battery check back in May, the battery got 5 stars and from then on I noticed the estimated max range on the guessometer was less optimistic than before,which I assumed was due to a software update. E.g., last August a 100% charge would result in a guess of about 115 mile range, and now it's guessing 98 miles. That's about right for a capacity bar loss, but not if the software is making a less wild guess.

I mostly charge using level 2, 5 nights a week at 80%, 2 nights a week to 100%.

Reporting from Houston,
Phil A. Phonic


Am I on the cusp?


you might be. how hot has it been? what is your normal charging habits? parked inside or out? did you have any regen circles available when you first started out?

blog.php?u=291&b=171
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philaphonic
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Re: Capacity bar disappears, then reappears

Sun Aug 19, 2012 3:24 pm

DaveinOlyWA wrote:
philaphonic wrote:Am I on the cusp?

you might be. how hot has it been? what is your normal charging habits? parked inside or out? did you have any regen circles available when you first started out?

blog.php?u=291&b=171


how hot has it been?
Highs lately in mid 90s.

what is your normal charging habits?
Usually: @240V, Midnight to 6 AM. 80% for 5 days/week, 100% for 2 days/week.

parked inside or out?
Outside, but covered.

did you have any regen circles available when you first started out?
Did not notice.
Phil A. Phonic
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Houston, TX
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grid electricity = 100% wind

leiko49
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Re: Capacity bar disappears, then reappears

Thu Aug 23, 2012 3:15 am

Over several weeks my capacity bars went from 12 to 11 back to 12 back to 11 back to 12. Then I brought in for my year service two days ago at 12, when I got it back from Nissan dealer back to 11 for a day (more then before). Nissan report stated it was 11 during their battery check. The main issue is the top range at 100 percent is not wavering whether 11 or 12, so the fluctuation signifies about 15 percent loss, period. I called the hot line when it was 11 (reflected in official battery report).
Last edited by leiko49 on Mon Oct 08, 2012 10:16 am, edited 1 time in total.
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Date Leased 9/1/2011
Phoenix, Arizona

User avatar
philaphonic
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Delivery Date: 16 Apr 2018
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Re: Capacity bar disappears, then reappears

Sun Aug 26, 2012 1:32 pm

My capacity bar loss appears to be permanent now. I'll be reporting this as suggested in the wiki soon and making an entry in the spreadsheet.

Also, on Friday, I managed to drive 64 miles with remaining miles on the GOM of 7. Dash reported efficiency of 4.5 m/kwh.
Phil A. Phonic
2018 Pearl White SV
Houston, TX
24 Schuco 230 W panels, 5.5 kW DC rooftop
grid electricity = 100% wind

Stoaty
Posts: 4467
Joined: Fri Jun 18, 2010 9:50 pm
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Re: Capacity bar disappears, then reappears

Sun Aug 26, 2012 3:02 pm

philaphonic wrote:My capacity bar loss appears to be permanent now. I'll be reporting this as suggested in the wiki soon and making an entry in the spreadsheet.

Also, on Friday, I managed to drive 64 miles with remaining miles on the GOM of 7. Dash reported efficiency of 4.5 m/kwh.

I went ahead and added you to the Wiki. Feel free to make any corrections or updates, or post them here and I will update your entry.
2011 Leaf with 62,000 miles given to Nephew
2013 Tesla Model S85 with 251 miles rated range at full charge
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