The 40KWH Battery Topic

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Makes sense but it's still occurring when the highs are 100F & it's only cooling into the 50-60's at night & the pack never gets less than 70Fish so that's why I'm attributing it to degradation. In the winter I have the charge timer set up so I drive the car 5-10 min after it finishes a 2 hour charge session(32A) so there's some heat in the pack for the reasons one wants heat when the car sits in a 41-52F ambient garage at night.
 
HerdingElectrons said:
As an anecdotal observation even though my LS Pro SOH is currently 92.93% after 23K miles & 16 months of use I don't notice any range reduction that impacts my daily needs. In fact I typically only charge to 60-70% in an effort to prolong the packs SOH because 98% of the time I typically only use 20-50% of the packs capacity/range on a given day.

However I have noticed a SUBSTANTIAL drop in how low the SOC has to get to have full Regen available. When the car was new I would have all 18 Regen segments on the dash display once the SOC dropped to 80-79%. The minimum SOC when all 18 segments are available has steadily gone down over the past 16 months. Now when at 79% SOC there's about 6 segments unavailable & the car needs to get to around 72-73%SOC before all 18 are available.

I'm aware temperature will affect this but my observations are when the dash indicated "temp" bar is more than 33% to 50%. When the temp bar is less than 33% & especially less than 25% there's a temporary additional reducing until the pack temperature is high enough to handle the regen amperage.
Click to expand...

Full regen in B Eco is 35-38 KW while E Pedal approaches 60 KW so you really don't want to maximize regen in most situations anyway. I would agree that temperatures (both hot and cold) will limit this to a point.

Your better bet longevity wise is a steadier power draw to maintain speed on flat ground easing the power/regen swings on slopes. Travel "with" the pack and this can be accomplished. There is no realistic way to get it perfect but this is what you should be striving for.
 
I've also noted that my full regen is kicking in at lower charge levels, and I've assumed it has to do with temperature. Though I'm hot as hell here for summer, we are chilly during the winter. My average pack temperature for the last few months has been around 48F (based on the sensors)

Having less regen though hasn't really impacted my efficiency that much, and as I do not charge above 80% anyway, its only been slightly limited. I don't have hard data but I think I noticed not getting full REGEN back until I was around 76% SOC.
 
danrjones said:
I've also noted that my full regen is kicking in at lower charge levels, and I've assumed it has to do with temperature. Though I'm hot as hell here for summer, we are chilly during the winter. My average pack temperature for the last few months has been around 48F (based on the sensors)

Having less regen though hasn't really impacted my efficiency that much, and as I do not charge above 80% anyway, its only been slightly limited. I don't have hard data but I think I noticed not getting full REGEN back until I was around 76% SOC.
Click to expand...

Yep, my battery temps are in the same range. I am rarely as high as 80% though so haven't seen any regen changes but still at 97% SOH so probably a bit too early to see anything anyway. On my 2018, it was pretty much the same, I did charge to a higher SOC generally but only because of the battery pack.

Right now I do the 30 min free DC most of the time usually starting charge at 20-30% SOC so I end no higher than 60-65% more or less. Did the same with 40 although starting at lower SOC was more common and would end up at 70-80% SOC.
 
Specific to the 2018 40 kWh what is the max regen?

There has been several topics and I swear both here and on YouTube videos I have seen folks say that by engaging both ECO and EPedal you can get more or even double your max regen. But I have looked at my screen and even in those modes the max appears to by -30 Kw in blue, which is the same max amount I get through careful application of the brake pedal in normal driving mode. I don't want to start a whole new thread so I'm curious if it changed for different battery sizes or model year?
 
I wouldn't treat the car's energy use display as an infallible source. It appears that many of the aspects of it are just programmed changes in response to button pushes, not actual measurements of power.Note that if you first engage Heat, and then A/C as well, the displayed energy usage doesn't change. It does seem as if the deceleration rate increases when both B and ePedal are engaged...







typo corrected
 
danrjones said:
Specific to the 2018 40 kWh what is the max regen?

There has been several topics and I swear both here and on YouTube videos I have seen folks say that by engaging both ECO and EPedal you can get more or even double your max regen. But I have looked at my screen and even in those modes the max appears to by -30 Kw in blue, which is the same max amount I get through careful application of the brake pedal in normal driving mode. I don't want to start a whole new thread so I'm curious if it changed for different battery sizes or model year?
Click to expand...

In Eco B; It varies depending on the usual things but no more than 37 KW


E Pedal; 57 KW

FYI; even at speeds as low as 35 mph, E Pedal regen over 50 KW.

E Plus is just about the same.

https://daveinolywa.blogspot.com/2018/11/e-pedal-verses-b-mode.html
 
Feb readings show another slight loss, but staying above 90.00 is a good thing.. - end of next month will be 2nd year anniversary.

Oct 21, 2019 - Km; 35500 Ahr; 104.06 SOH; 90.61
Nov 15, 2019 - Km; 37018 Ahr; 104.54 SOH; 90.56
Dec 14, 2019 - Km; 38703 Ahr; 105.07 SOH; 91.02
Jan 16, 2020 - Km; 40322 Ahr; 105.03 SOH; 90.98
Feb 13, 2020 - Km; 42114 Ahr; 104.99 SOH; 90.95
 
nightleaf said:
Feb readings show another slight loss, but staying above 90.00 is a good thing.. - end of next month will be 2nd year anniversary.

Oct 21, 2019 - Km; 35500 Ahr; 104.06 SOH; 90.61
Nov 15, 2019 - Km; 37018 Ahr; 104.54 SOH; 90.56
Dec 14, 2019 - Km; 38703 Ahr; 105.07 SOH; 91.02
Jan 16, 2020 - Km; 40322 Ahr; 105.03 SOH; 90.98
Feb 13, 2020 - Km; 42114 Ahr; 104.99 SOH; 90.95
Click to expand...

Nice! Looks like mid March will be the big reading. You are seeing what I saw my last 9 months; nearly no loss with one bump up. .03% a month? It will take you 2½ years to drop below 90% at that rate. :)
 
For one thing, these numbers aren't meaningful. A 7.5% cycle count difference over a few months isn't enough to actually see any degradation.
 
Date Miles QC SOH
1/03/19 200 3 99.62
1/30/19 1896 22 99.32
2/14/19 3365 37 98.75
2/27/19 4290 46 98.71
3/28/19 6854 79 98.34
4/16/19 8525 103 98.06
5/06/19 10230 121 97.78
5/15/19 10983 125 96.33
5/29/19 12199 133 95.86
6/18/19 13602 141 95.58
7/02/19 14612 145 95.35
7/15/19 15078 147 95.19
8/02/19 15930 151 94.94
8/17/19 16804 159 93.98
9/05/19 17887 167 93.72
9/16/19 18549 171 93.56
9/29/19 19509 178 93.40
10/14/19 20452 187 93.28
11/04/19 21486 196 93.20
11/18/19 22446 202 91.75
12/02/19 23288 210 91.69
12/16/19 24229 216 91.64
12/30/19 25049 222 91.60
01/15/20 26086 233 91.55
02/01/20 27588 248 91.48
02/14/20 28658 260 89.96
02/19/20 29061 262 89.94
 
89% already on a 2019?

I'm coming up on another adjustment in about 2-3 weeks, but I'm hoping to see "not much" adjustment as the battery has been averaging around 48F the last few months.
 
danrjones said:
89% already on a 2019?
Click to expand...
Yes. Probably due to hot summers in TX, parked outside during the day, and almost daily QCs. My next vehicle will be a Leaf Plus or a Niro EV because I need adaptive cruise control and more range.
 
Triggerhappy007 said:
danrjones said:
89% already on a 2019?
Click to expand...
Yes. Probably due to hot summers in TX, parked outside during the day, and almost daily QCs. My next vehicle will be a Leaf Plus or a Niro EV because I need adaptive cruise control and more range.
Click to expand...

Don't feel too bad, I expect to drop into the 80's quickly this summer. We have cool winters but blazing summers, and I also park outside. I was at 91.74% as of yesterday and haven't even owned it for a year yet (May), AND I only have about 4300 miles.
 
coleafrado said:
So you're expecting >11% capacity loss in under two years?
Click to expand...


This is a new generation of battery, so I don't know what to expect as the years pass. I do know that protecting my battery from extreme heat and driving it few miles, while keeping the SOC fairly low, has done little or nothing to slow degradation. I like driving the car, but I'll likely turn it in to lease an SV Plus with Around View, and then maybe buy that car if I'm still driving when that lease ends. I had hoped to buy this one.
 
Has anyone figured out a relationship between HX, which people seem to think is a measurement of the internal resistance of the battery, and SOH?

Tracking my data HX has been a bit odd. While SOH has slowed to a crawl during the winter, HX started going down in the early winter, I did one fast charge and it shot back up and then reduced a bit after that then started climbing again. Why would HX drop at the start of the cooler temps but now in late winter start rising with the same cooler temps? Seems a bit strange to me. Interesting to plot though. I'd also be curious to compare HX from one person to the next. We seem to focus a lot on SOH. (Assuming HX actually means anything)
 

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