The 40KWH Battery Topic

[rogersleaf]

Looks like you might have had a small bump up in there that masked the general degradation since .04% loss in 3 months is bit tough to believe. Now, .4 or .5 I can believe. I think my smallest 3 month spread was in the .3 range?

Somehow think the entire degradation curve is cooked into the BMS software.
That's apparent with the stair-step pattern I see others recording, I don't watch that closely.

I do think I got a really solid car & battery pack. I'm not noticing a drop in usable range thus far.
Was at the dealer for a tire rotation last week. Their LEAF tech came out to return my keys, commented this one is definitely dialed in.

[DougWantsALeaf]

Your stats look really good. Hope my Leaf hold up so well over next 20k miles.

[nightleaf]

So I just did another trip from Richmond, BC to Whistler, BC in Aug 2020, started with 100%batt and ended the trip with 33% remaining.
The same trip in Aug 2018 resulted in 35%remaining, the weather conditions were very similar, no a/c used and the same 4 people in the car... my son is about 20lbs heaver now but everyone else the same.

Even though the SOH shows a significant drop (almost 10% between the two trips), I did not seem much difference in range... I am not convinced the SOH leafspy reading is an accurate representation of the remaining capacity.

The return trip was also very similar, about 47% used for each return trip.

Aug 01, 2018 - Km; 08,495 Ahr; 112.20 SOH; 97.19; HX 114.89
Oct 21, 2019 - Km; 35,500 Ahr; 104.06 SOH; 90.61; HX 116.48
Aug 28, 2020 - Km; 46,751 Ahr; 102.11 SOH; 88.45; Hx 113.38

[DaveinOlyWA]

So I just did another trip from Richmond, BC to Whistler, BC in Aug 2020, started with 100%batt and ended the trip with 33% remaining.
The same trip in Aug 2018 resulted in 35%remaining, the weather conditions were very similar, no a/c used and the same 4 people in the car... my son is about 20lbs heaver now but everyone else the same.

Even though the SOH shows a significant drop (almost 10% between the two trips), I did not seem much difference in range... I am not convinced the SOH leafspy reading is an accurate representation of the remaining capacity.

The return trip was also very similar, about 47% used for each return trip.

Aug 01, 2018 - Km; 08,495 Ahr; 112.20 SOH; 97.19; HX 114.89
Oct 21, 2019 - Km; 35,500 Ahr; 104.06 SOH; 90.61; HX 116.48
Aug 28, 2020 - Km; 46,751 Ahr; 102.11 SOH; 88.45; Hx 113.38

Single trips can't be used as the margin of error can be very large. I would suggest something you do regularly that is at least 100 miles in length. Need to have had at least 5-10 trips and the more you have, the better. You will quickly see that the 9% variance in SOH is easily overcome by the variances of the trips made.

However, your comment on SOH not being a realistic picture of battery capacity has merit. As we know, sometimes adjustments go up which is realistically not possible suggesting that SOH has become a sort of report card for your driving behavior or better yet; an algorithm that adjusts battery capacity based on driver habits. More for people who stretch the range, less for people who rarely need it to enhance long term viability.

Either way, its obvious these adjustments are not as they appear to be.

[nightleaf]

Agree with your margin of error comment, the issue is I never do any trips longer than 100Mi other that this one from Richmond to Whistler, which is about 145KM (90Mi), I have done two other trips in between and very similar results..,

[/quote]
Single trips can't be used as the margin of error can be very large. I would suggest something you do regularly that is at least 100 miles in length. Need to have had at least 5-10 trips and the more you have, the better. You will quickly see that the 9% variance in SOH is easily overcome by the variances of the trips made.

However, your comment on SOH not being a realistic picture of battery capacity has merit. As we know, sometimes adjustments go up which is realistically not possible suggesting that SOH has become a sort of report card for your driving behavior or better yet; an algorithm that adjusts battery capacity based on driver habits. More for people who stretch the range, less for people who rarely need it to enhance long term viability.

Either way, its obvious these adjustments are not as they appear to be.
[/quote]

[SageBrush]

Agree with your margin of error comment,

Why invoke error when there is wind ?

[danrjones]

My 2018 is in the middle of an adjustment.
Normally I try and get a leaf-spy reading every day for a few days leading up to the adjustment, but this time I was not able to do so, as I was out of town and my wife was using it. So my last reading was about 5-6 days before it started. I'm not going to put all my readings just the last two before the adjustment and the current two from yesterday and today. My guess would be that SOH was around 89.28. This is the first time my SOH has ever increased in either a 3 month adjustment or the daily adjustments.

Date | SOH | AMPhr | Hx

8/28/2020 89.31 103.10 108.18
8/31/2020 89.30 103.09 108.11
9/7/2020 89.46 103.27 107.97
9/8/2020 89.87 103.75 107.84

[DaveinOlyWA]

More is always a good thing.

[DougWantsALeaf]

Congrats. The BMS taketh..but every once in a while giveth.

[HerdingElectrons]

I'm hitting two years of ownership & just broke 30K miles & I'm at 90.96 SOH