LeftieBiker
Posts: 9222
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: The 40KWH Battery Topic

Sat Jul 21, 2018 11:40 pm

Here are my (late) July stats. I'd like to note that part of the reason I'm cooling my garage is to provide a "control" - a car that isn't getting hot regularly, if at all. So far it doesn't seem to matter much.

SOH: 97.96

AH: 113.08

Hx: 102.91

SOC: 72.7

GIDs: 373

Temp sensors: 74.3, 74.7, 75.4 (These readings are about 4-8F hotter than the may & June readings, and 30F warmer than the April readings.)

June's readings:

SOH = 99.25

AH = 114.57

Hx = 100.77
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

DaveinOlyWA
Posts: 13133
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

Sun Jul 22, 2018 9:57 am

LeftieBiker wrote:Here are my (late) July stats. I'd like to note that part of the reason I'm cooling my garage is to provide a "control" - a car that isn't getting hot regularly, if at all. So far it doesn't seem to matter much.

SOH: 97.96

AH: 113.08

Hx: 102.91

SOC: 72.7

GIDs: 373

Temp sensors: 74.3, 74.7, 75.4 (These readings are about 4-8F hotter than the may & June readings, and 30F warmer than the April readings.)

June's readings:

SOH = 99.25

AH = 114.57

Hx = 100.77



Seems like you are losing capacity faster than me. SOH 1½ in a month? Sounds like you had at least one big drop in there somewhere.

I have now had 2 and there seems to be no reason for them. One happened randomly during a short 3 day period of light usage while the other happened when parked in the Sun for 12½ days.

But I have done a half dozen road trips consisting of 5+ QCs, temps in near or over 120º without any major damage.

So wondering if BMS does a recalibration randomly that accounts for these big drops?
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 deceased. 29,413 miles. 2018 S40; 8743 miles, 485 GIDs, 37.6 kwh 111.39 Ahr , SOH 96.49, Hx 114.98
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

LeftieBiker
Posts: 9222
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: The 40KWH Battery Topic

Sun Jul 22, 2018 2:10 pm

I see two reasons for the big drop. First, the interval is more like 6 weeks - I was late with this measurement. Second, the battery temp as measured by the sensors, while not high at all, was much higher than it was in the Spring. The "Lettuce Pack" may be just like the Canary pack, in that anything above actual cold temps accelerates degradation.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

LeftieBiker
Posts: 9222
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: The 40KWH Battery Topic

Sat Aug 18, 2018 4:23 am

I finally did my August LeafSpy read, and I finally charged to 100% before doing it. The cell voltages leveled out nicely after EQ, with only a 9MV spread. SOH only dropped a little! Maybe the garage cooling is actually helping. Stats:

SOH: 97.76

AH: 112.85 (but only 109 on summary screen!)

Hx: 103.87

SOC: 97.2

GIDs: 485


Temp sensors: 73.8,75.9, 74.1
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

DaveinOlyWA
Posts: 13133
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

Sat Aug 18, 2018 7:51 am

LeftieBiker wrote:I finally did my August LeafSpy read, and I finally charged to 100% before doing it. The cell voltages leveled out nicely after EQ, with only a 9MV spread. SOH only dropped a little! Maybe the garage cooling is actually helping. Stats:

SOH: 97.76

AH: 112.85 (but only 109 on summary screen!)

Hx: 103.87

SOC: 97.2

GIDs: 485


Temp sensors: 73.8,75.9, 74.1



I found that my cells balanced very well even when only charging to full occasionally (about once a month) what is your mileage?

I have screen shot of last full charge the first week of August at 9867 miles. Unlike some, my odometer issues were reported to Jim several months ago and his next update fixed it. The screen shot shows 96.25% and now, 650ish miles later, its 96.16 so the numbers are dropping but gradually.

http://daveinolywa.blogspot.com/2018/08 ... eview.html
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 deceased. 29,413 miles. 2018 S40; 8743 miles, 485 GIDs, 37.6 kwh 111.39 Ahr , SOH 96.49, Hx 114.98
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

LeftieBiker
Posts: 9222
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: The 40KWH Battery Topic

Sat Aug 18, 2018 12:36 pm

I still have to update to fix the odometer issue. I think I have about 900 miles on the car, about 700 of them from me driving it.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

mdeekay
Posts: 1
Joined: Tue Sep 04, 2018 3:26 am
Delivery Date: 15 Mar 2018

Re: The 40KWH Battery Topic

Tue Sep 04, 2018 3:35 am

I also got 2 major drops in SOH on my 2018 Nissan Leaf within the last 6 months of ownership. I lost 2 percent in mai and another 1.5 percent in august. I am living in norway and the car was parked in a garage when the drops happened. So heat can't be an issue.
My leaf has driven 15000km so far and got only one QC during the last 6 months.

Those are my latest readings:
SOH: 95.04%
@ 15400km

If this rapid degradation continues, I will be down to 66% within 3 1/2 years or 100.000km.

LeftieBiker
Posts: 9222
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: The 40KWH Battery Topic

Tue Sep 04, 2018 5:35 am

There is usually more drop in the first year of a lithium battery's life than later years, but 5% is too much if it extends out to 10% annual. Either there is another "BMS Error" in the 40kwh packs, or they are living up to the nickname "Lettuce Pack."

It's about time to check mine again, but we're in a heatwave yet again, and I don't want to charge to 100%. Maybe I'll read it at the 70% or so it's at now.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

DaveinOlyWA
Posts: 13133
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

Tue Sep 04, 2018 6:06 am

mdeekay wrote:I also got 2 major drops in SOH on my 2018 Nissan Leaf within the last 6 months of ownership. I lost 2 percent in mai and another 1.5 percent in august. I am living in norway and the car was parked in a garage when the drops happened. So heat can't be an issue.
My leaf has driven 15000km so far and got only one QC during the last 6 months.

Those are my latest readings:
SOH: 95.04%
@ 15400km

If this rapid degradation continues, I will be down to 66% within 3 1/2 years or 100.000km.


At least you are on pace for a warranty replacement. I am on pace now to have 33% degradation at 100,000 miles so I will just miss it.
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 deceased. 29,413 miles. 2018 S40; 8743 miles, 485 GIDs, 37.6 kwh 111.39 Ahr , SOH 96.49, Hx 114.98
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

Guzziboy
Posts: 8
Joined: Sat Aug 18, 2018 12:17 pm
Delivery Date: 19 Aug 2018

Re: The 40KWH Battery Topic

Tue Sep 04, 2018 8:54 pm

Re: 2016 30 kWh Battery data
EditDelete postReport this postQuote
Tue Sep 04, 2018 11:46 pm

I bought my 2018 Leaf on Aug 25. We live in New Hampshire and ended up doing a little 1200 mile road trip this last week to break the car in which brought us to all 6 New England States and New York State. The weather was quite hot, 90+ degrees most days. The car did better than I had personally expected. I didn't buy this car to take road trips in. Essentially I bought it for winter commuting. However it did quite well for 250 mile days though after 2 DCQC the battery temps were 120+F on those days. Keep in mind those days incurred 70mph highway speeds at summer temps. For the cars price point ( sub $20k after Tax Credit) I think it's a fantastic vehicle. Anyhow here are Leaf Spy numbers the day I brought it home and after returning from the 1200 mile trip.

8/26/18
SOH 98.41
Hx 98.12
AHr 113.604

9/2/18 after 1200 miles
SOH 98.34
HX 101.76
AHr 113.524

Worth noting that in between those two samples the following was recorded around 1000 miles showing that numbers dipped and then increased. Which is sort of interesting.
SOH 98.22
HX 101.35
AHr 113.466

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