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DNAinaGoodWay
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Delivery Date: 03 Dec 2012
Leaf Number: 23156
Location: Central Massachusetts

Re: 2015: Battery Data Report @ 100% Charge

Tue Apr 04, 2017 5:51 am

Compare this to the numbers in my signature:

IMG_6518.JPG


IMG_6517.JPG


How? Last week it went on a 180 mile trip with 3 QCs on Monday and a 100 mile trip with 1 QC on Tuesday then sat in the garage at 40% from Wednesday to Sunday while I was away. The above is after a full L2 charge on Monday.
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'12 SL last reading @ 2 yr, 22k, 260 GIDs, 62.35 Ahr

'15 SV w/QC, Mfd 5/14, Leased 8/14, 292 GIDs, 64.38 Ahr when new
@ 36 months, 34k, 270 GID, 57.49 Ahr

'17 Bolt LT



6.72 kW Array

DaveinOlyWA
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Posts: 12218
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 10 Nov 2016
Leaf Number: 314199
Location: Olympia, WA
Contact: Website

Re: 2015: Battery Data Report @ 100% Charge

Fri Apr 07, 2017 6:10 am

DNAinaGoodWay wrote:Compare this to the numbers in my signature:

IMG_6518.JPG


IMG_6517.JPG


How? Last week it went on a 180 mile trip with 3 QCs on Monday and a 100 mile trip with 1 QC on Tuesday then sat in the garage at 40% from Wednesday to Sunday while I was away. The above is after a full L2 charge on Monday.


so this reading was taken several days after your last significant usage of the car?

This is impressive. My ahr/GIDs are pretty stable but my Hx drops daily between fast charges. Only takes 3 days of light usage to get below 100%
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 (build 10/2016)"low water marks" 26,100.2 miles.363GID Ahr 79.55Hx95.35%kwh28.1QCs227,L2's 237
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

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DNAinaGoodWay
Posts: 2751
Joined: Mon Dec 17, 2012 1:43 am
Delivery Date: 03 Dec 2012
Leaf Number: 23156
Location: Central Massachusetts

Re: 2015: Battery Data Report @ 100% Charge

Fri Apr 07, 2017 2:32 pm

Four days of regular commuting, 30-50 miles/day, and 2 L2s later and it's starting to fade.

IMG_6526.JPG


IMG_6525.JPG
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'12 SL last reading @ 2 yr, 22k, 260 GIDs, 62.35 Ahr

'15 SV w/QC, Mfd 5/14, Leased 8/14, 292 GIDs, 64.38 Ahr when new
@ 36 months, 34k, 270 GID, 57.49 Ahr

'17 Bolt LT



6.72 kW Array

User avatar
DNAinaGoodWay
Posts: 2751
Joined: Mon Dec 17, 2012 1:43 am
Delivery Date: 03 Dec 2012
Leaf Number: 23156
Location: Central Massachusetts

Re: 2015: Battery Data Report @ 100% Charge

Sat Apr 08, 2017 7:24 am

So, how does this work again? How does heavy usage temporarily restore capacity? If a battery degrades, shouldn't it stay degraded? Not that I'm complaining, it just doesn't make sense to me.
'12 SL last reading @ 2 yr, 22k, 260 GIDs, 62.35 Ahr

'15 SV w/QC, Mfd 5/14, Leased 8/14, 292 GIDs, 64.38 Ahr when new
@ 36 months, 34k, 270 GID, 57.49 Ahr

'17 Bolt LT



6.72 kW Array

Phatcat73
Posts: 433
Joined: Fri Feb 08, 2013 2:44 pm
Leaf Number: 401511
Location: Buffalo Grove, Il

Re: 2015: Battery Data Report @ 100% Charge

Sat Apr 08, 2017 9:39 am

I've learned it can fluctuate based on numerous variables. I've seen my 13 go from 81% SOH to 88 then back doen to 81 over the course of a year in a seasonal setting.
2016 SV; purchased 20-Jan-17, <5k, 98% SOH; 01-Apr-17
2013 SV; purchased 6-March-13 44k, 81% SOH; 3-Apr-17
2015 S; purchased 29-July-14, moved to AZ Nov-2014, 19k, 83% SOH; 30-Mar-17
(LD storage) 2009 Ford Escape Hybrid 4x2), 101k

DaveinOlyWA
Gold Member
Posts: 12218
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 10 Nov 2016
Leaf Number: 314199
Location: Olympia, WA
Contact: Website

Re: 2015: Battery Data Report @ 100% Charge

Sat Apr 08, 2017 12:57 pm

DNAinaGoodWay wrote:So, how does this work again? How does heavy usage temporarily restore capacity? If a battery degrades, shouldn't it stay degraded? Not that I'm complaining, it just doesn't make sense to me.


lower numbers don't always mean permanent capacity loss. It could simply be poor pack balance. Improving pack balance at the top end means more range, improving it on the low end means more longevity.

So why is this most noticeable during heavy usage? Could be longer charging times, more time to balance?
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 (build 10/2016)"low water marks" 26,100.2 miles.363GID Ahr 79.55Hx95.35%kwh28.1QCs227,L2's 237
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

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DNAinaGoodWay
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Joined: Mon Dec 17, 2012 1:43 am
Delivery Date: 03 Dec 2012
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Location: Central Massachusetts

Re: 2015: Battery Data Report @ 100% Charge

Sat Apr 08, 2017 1:22 pm

I dunno. I almost always charge to 100% and my pack is as balanced as it could be. But last week's trips involved QCs from a low SOC to maybe 80% tops, only about 20 minute sessions. Then some highway driving. Somehow, fast flows in and out "undegrades" it? Overcomes the built up resistance, if only temporarily?
'12 SL last reading @ 2 yr, 22k, 260 GIDs, 62.35 Ahr

'15 SV w/QC, Mfd 5/14, Leased 8/14, 292 GIDs, 64.38 Ahr when new
@ 36 months, 34k, 270 GID, 57.49 Ahr

'17 Bolt LT



6.72 kW Array

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drees
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Re: 2015: Battery Data Report @ 100% Charge

Sat Apr 08, 2017 3:42 pm

DNAinaGoodWay wrote:So, how does this work again? How does heavy usage temporarily restore capacity? If a battery degrades, shouldn't it stay degraded? Not that I'm complaining, it just doesn't make sense to me.

That's because the numbers are just the computer's estimate of capacity. It's not perfect. To do that you need to fully cycle the pack under controlled conditions.
'11 LEAF SL Powered By 3.24 kW Enphase Solar PV

User avatar
DNAinaGoodWay
Posts: 2751
Joined: Mon Dec 17, 2012 1:43 am
Delivery Date: 03 Dec 2012
Leaf Number: 23156
Location: Central Massachusetts

Re: 2015: Battery Data Report @ 100% Charge

Sun Apr 09, 2017 4:08 am

drees wrote:
DNAinaGoodWay wrote:So, how does this work again? How does heavy usage temporarily restore capacity? If a battery degrades, shouldn't it stay degraded? Not that I'm complaining, it just doesn't make sense to me.

That's because the numbers are just the computer's estimate of capacity. It's not perfect. To do that you need to fully cycle the pack under controlled conditions.


So the computer is wrong. That makes sense as the battery pack must be degraded at this point. So, somehow fast flows trick the computer into temporarily reporting restored capacity?
'12 SL last reading @ 2 yr, 22k, 260 GIDs, 62.35 Ahr

'15 SV w/QC, Mfd 5/14, Leased 8/14, 292 GIDs, 64.38 Ahr when new
@ 36 months, 34k, 270 GID, 57.49 Ahr

'17 Bolt LT



6.72 kW Array

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drees
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Location: San Diego

Re: 2015: Battery Data Report @ 100% Charge

Sun Apr 09, 2017 7:52 am

Exactly. I should also clarify my earlier statement - you need external tools to measure capacity, a controlled cycle of the battery won't help the onboard computer. Think of something similar to what the AVTA tests do where they pull the pack and use lab equipment to charge / discharge the pack.

The closest way to do that without pulling the pack is to measure energy from the wall used to charge from a defined setpoint to full, but even that has a decent amount of variance so you have to run a few cycles to get an average.
'11 LEAF SL Powered By 3.24 kW Enphase Solar PV

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