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Re: Nissan issues software update to solve 30 kwh battery issues

Posted: Fri Jul 06, 2018 5:20 pm
by SageBrush
jfr2006 wrote:Here are now my VLBW values after the update:

Informative, thanks.

Re: Nissan issues software update to solve 30 kwh battery issues

Posted: Sat Jul 07, 2018 1:02 am
by jfr2006
And here is the energy consumed from the mains for a charge from the VLBW before and after the update, respectively:


Image

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Re: Nissan issues software update to solve 30 kwh battery issues

Posted: Sat Jul 07, 2018 5:14 am
by SageBrush
^^ Most excellent data.
Thanks!

Re: Nissan issues software update to solve 30 kwh battery issues

Posted: Sat Jul 07, 2018 6:59 am
by Paulgreysv
bmw wrote:Just over three months ago I installed Leaf-Spy on my phone. At that time, I had readings as low as AHr = 68.17, SOH = 85.77%, and Hx = 80.92 on my one year old 2017 Leaf with just under 6,7000 miles. Now three months later the readings are AHr = 75.776, SOH=95.34, and Hx = 88.54 at 8,500 miles on the odometer. I have been charging the battery to 100% more often, and have taken the car for longer drives. I am wondering if this dramatic change might be due to the so called software error. In any case, the recent values are encouraging, and are continuing to improve.

Does anyone here have any idea what is going on?


I have a 15 month old 2017. My capacity as measured by leaf spy started at 69 went up to 73 in three months then drifted down to 71 over nine months and came back up to 72.5 over three months as I started fast charging and driving longer distances more. After update I have 76 AHr. I can't make sense of it. I met another leaf owner that fast charges all the time and drives 70mph for 70 miles everyday. He had 82AHr. That is why I started fast charging and my capacity started going up!

Re: Nissan issues software update to solve 30 kwh battery issues

Posted: Sat Jul 07, 2018 7:16 am
by jfr2006
Yes, that's correct. As strange it may be, every time i do a fast charge, the SOH rises or keeps high. That's why i believe the update is: it corrects this problem that requires a fast charge to show the real SOH ;)

I will be checking if it's true and the SOH now holds without the need of fast charging...

Re: Nissan issues software update to solve 30 kwh battery issues

Posted: Sat Jul 07, 2018 8:46 am
by SageBrush
jfr2006 wrote:Yes, that's correct. As strange it may be, every time i do a fast charge, the SOH rises or keeps high. That's why i believe the update is: it corrects this problem that requires a fast charge to show the real SOH ;)

I will be checking if it's true and the SOH now holds without the need of fast charging...

IIRC, EPA measured ~ 32 kWh from the meter to charge from empty to full. VLBW is within a couple percent of empty (say 0.5 kwh ?) so a conservative estimate of capacity loss is 1 - (27.1+0.5)/32 = 0.1375 = 13.75%. Your Ahr readings are jumping around, but consistently higher than the charge amount suggests.

I read this as over-optimistic BMS reporting. Not surprising for the Nissan skeptics amongst us, but more data and more cars are needed to draw firmer conclusions.

Re: Nissan issues software update to solve 30 kwh battery issues

Posted: Sat Jul 07, 2018 9:15 am
by lorenfb
SageBrush wrote:
but more data and more cars are needed to draw firmer conclusions.


And months of data! Guessing not allowed.

Re: Nissan issues software update to solve 30 kwh battery issues

Posted: Sat Jul 07, 2018 9:20 am
by jfr2006
On VLBW, Leafspy measured 1.8kWh remaining ;)

Re: Nissan issues software update to solve 30 kwh battery issues

Posted: Sat Jul 07, 2018 12:35 pm
by SageBrush
jfr2006 wrote:On VLBW, Leafspy measured 1.8kWh remaining ;)

Yes, but that includes an unusable fraction.

Re: Nissan issues software update to solve 30 kwh battery issues

Posted: Sat Jul 07, 2018 12:55 pm
by jfr2006
SageBrush wrote:
jfr2006 wrote:On VLBW, Leafspy measured 1.8kWh remaining ;)

Yes, but that includes an unusable fraction.


No, it does not! I have done the experiment previously until i run out of battery. Got the turtle mode when i was with 0.4kWh measured by LeafSpy ;)