DaveinOlyWA
Gold Member
Posts: 12049
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 10 Nov 2016
Leaf Number: 314199
Location: Olympia, WA
Contact: Website

Re: Capacity Loss on 2011-2012 LEAFs

Sat Sep 30, 2017 10:48 am

abasile wrote:
This is the sort of issue that leads to calls for more regulation. Perhaps all EV manufacturers should be forced to disclose metrics related to battery life, such as coulombic efficiency which has been shown to be a proxy for how rapidly a Li-ion battery is likely to degrade.


they could provide it and the 3 people who would read it would undoubtedly come away with more insight...

but as we all know; charts and graphs will do nothing. Nissan put out a chart that was actually quite realistic (if you could find those driving conditions that is...) and it did nothing... Very few knew about it and even less could extrapolate the data into their personal existence.
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 (build 10/2016)"low water marks" 24,261.3 miles.363 GIDAhr 80.66Hx95.95%kwh28.1QCs205,L2's 226
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abasile
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Posts: 1874
Joined: Thu Sep 02, 2010 10:49 am
Delivery Date: 20 Apr 2011
Location: Arrowbear Lake, CA

Re: Capacity Loss on 2011-2012 LEAFs

Sat Sep 30, 2017 12:17 pm

DaveinOlyWA wrote:they could provide it and the 3 people who would read it would undoubtedly come away with more insight...

but as we all know; charts and graphs will do nothing. Nissan put out a chart that was actually quite realistic (if you could find those driving conditions that is...) and it did nothing... Very few knew about it and even less could extrapolate the data into their personal existence.

It would probably need to be distilled and simplified for a mass audience, but be based on measurable standards.

The metric could be "average battery life expectancy" in years, i.e., 4.6 years before dropping below 80% capacity (maybe for a LEAF).

If properly implemented, this could be nearly as useful as the EPA range ratings for EVs, which are watched very closely.

The downside is that regulations like this could lengthen the path to market for battery improvements. As the market matures, though, this might be a reasonable tradeoff.
2011 LEAF at 69K miles, pre-owned 2012 Tesla S 85 at 89K miles
LEAF battery: 9/12 bars and < 49 Ah (-28% vs. new)
Tesla battery: 250+ miles of range (-5% vs. new)

Philipr144
Posts: 22
Joined: Fri Jul 07, 2017 4:19 am
Delivery Date: 05 Jul 2017
Location: Bakersfield Ca

Re: Capacity Loss on 2011-2012 LEAFs

Tue Oct 10, 2017 9:03 pm

I'm almost certain that degradation is mostly because of heated cells during charging. Since April I've lost 2 bars. I have quick charged about 90 times since then. I watched it go from a 16kw batter to a 14.6kw battery all based on 115 degree quick charging in this Bakersfield summer heat.

I know most wouldn't approve of this type of use but it's what I got.. I drive my kids to school and it's about 100 miles a day. I have to fast charge 2 times a day now that school is back in.
2011 Leaf 76% SOH 212Gids 50ah 66.3k miles 10 bar

Supersleeper
Posts: 75
Joined: Mon Aug 07, 2017 10:04 am
Delivery Date: 06 Aug 2017
Location: SF Bay Area

Re: Capacity Loss on 2011-2012 LEAFs

Wed Oct 11, 2017 2:42 pm

Philipr144 wrote:based on 115 degree quick charging in this Bakersfield summer heat.


YIKES! My best advice? Move. I installed fiberglass insulation one summer in Bakersfield at 115 F, and I about died. I had a broken swamp cooler I learned how to fix REAL FAST. Won't do that again. Visalia, Dinuba, Fresno and similar towns up north are much cooler, and should have similar home prices.

115 F, no thanks...

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