The 40KWH Battery Topic

[danrjones]

I'm the same way, I don't drive enough to notice losses if they are real. In fact I tend to charge about every other night for 2 hrs only on lvl 2. That's all I need. I get down to about 50% and charge back to about 80%.

Though twice a year I'll need to drive a round trip of about 180 miles to get it "serviced". With the chargers popping up it really shouldn't be an issue,

[webeleafowners]

Same with us with our 2016 SV. No noticeable range loss. Every couple weeks we have a road trip so we do a full overnight L2. GOM still usually around 204 km.

[DougWantsALeaf]

I wonder if you could build in a small algorithm which undershoots efficiency to start, then slowly ramps it up over a few years (and maybe shrinking a reserve). This would give you the feeling of a stable usable range, and manage the battery decline for say 3 years, which would give people a good feeling. Then a gentle decline would be considered acceptable as the car would no longer be "new". It would also manage through most lease agreements.

I follow some of the Tesla boards, and the amount of screaming after the software change has been deafening (and as they are well healed lawsuits are following). Also, there are a growing number of Bolt drivers reporting 10% range drops and more after 2-3 years of driving. While I would put both at rates less than what most (now not all) leaf drivers experience, its not 0. Maybe 3% a year across it all. Our 13 leaf, which was at the center of the curve, lost about 20% after 6 years, 11 of 12 bars, but we only put on 6K miles a year (traded it in at 37K miles).

[danrjones]

My 2018 has in theory lost almost 6% but the first 3% was before I bought it, as it sat around for a full year on a hot dealer lot.

But the second part of that is how that loss curve changes over time - will it be linear? Will it level off over time?

Assuming the loss is real, I could see 8% by the end of my first year (two years including the time on the lot)
But the next two years after that could be 4%.

[DougWantsALeaf]

https://www.independent.co.uk/life-styl ... 56226.html

Looks like the eGolf has similar GOM dynamics to the Leaf. Maybe a bit worse.

I still advocate for a kWh remaining on the dash. Its like gallons remaining in the tank. Based on weather, speed, etc. you can you use your super computer on your shoulder to determine remaining range.

[LeftieBiker]

I still advocate for a kWh remaining on the dash. Its like gallons remaining in the tank. Based on weather, speed, etc. you can you use your super computer on your shoulder to determine remaining range.

How would that be different from a SOC display? If I see kwh remaining, I will convert to fractions of full/SOC% in my (formerly) supercomputer.

[SageBrush]

I follow some of the Tesla boards, and the amount of screaming after the software change has been deafening

Err .... what are you talking about ?

[DaveinOlyWA]

My 2018 has in theory lost almost 6% but the first 3% was before I bought it, as it sat around for a full year on a hot dealer lot.

But the second part of that is how that loss curve changes over time - will it be linear? Will it level off over time?

Assuming the loss is real, I could see 8% by the end of my first year (two years including the time on the lot)
But the next two years after that could be 4%.

If it were linear in time or distance, I would be over 10% by now. As reported, I get large adjustments to the BMS every 90 days which have all gone down except the last one which went up. If the next one goes down, that essentially means 6 months of negated changes with a net result near zero.

[danrjones]

Latest Data

Date SOH AMPHr Hx
5/03/2019 97.63 112.70 97.50
5/06/2019 97.62 112.69 97.94
5/07/2019 97.61 112.68 98.03
5/10/2019 97.60 112.67 98.39
5/13/2019 97.59 112.66 98.55
5/15/2019 97.58 112.65 98.73
5/19/2019 97.57 112.63 98.84
5/27/2019 97.55 112.61 99.27
6/01/2019 97.53 112.59 99.61
6/04/2019 97.50 112.55 100.12
6/11/2019 97.44 112.48 101.03
6/12/2019 97.43 112.47 101.25
6/13/2019 97.42 112.46 101.25
6/14/2019 96.49 111.39 101.58
6/15/2019 96.28 111.15 101.58
6/16/2019 95.64 110.41 101.67
6/17/2019 95.42 110.15 101.82
6/19/2019 95.40 110.13 102.15
6/20/2019 95.38 110.11 102.25
7/15/2019 95.19 109.89 103.22
7/24/2019 95.10 109.78 104.04
8/11/2019 94.90 109.55 104.95
8/30/2019 94.73 109.36 106.05
9/05/2019 94.68 109.30 106.27

[danrjones]

Where are the temp sensors on the battery?

Last night I went to bed the temps were 97.7 max and 96.2 min, not a big spread.

This am the temps were 87.4 and 80.6. Pretty big spread?