danrjones wrote: ↑
Mon Jul 13, 2020 7:30 am
DaveinOlyWA wrote: ↑
Mon Jul 13, 2020 6:15 am
danrjones wrote: ↑
Sun Jul 12, 2020 8:01 pm
Death by a thousand paper cuts?
My in town isn't large enough to exceed about 20 miles a day. And my actual commute is about 2.5 each way. Even if the battery heavily degrades in the heat the car will do fine in town for years. Mileage might be irrelevant to degradation ...
What is your SOC targets for charge/discharge? What "seems" to be common are LEAFs driven heavily that degrade slowly while other LEAFs driven very lightly degrade faster. On the latter, there was a lot of evidence suggesting the lack of custom charge settings being the a factor with more than a handful simply "plugging it in and forgetting it"
My 30 kwh LEAF with supposedly one of the worst batteries went 30,000 miles in 14 months and 2 days died with 100% SOH and ahr of 82.05 of max 82.34 or 99.6% of new capacity. Since I rarely charged to full, I don't know how close I was to the maximum GID count of 363 but guessing I wasn't too far off. I did 116 miles on a single charge in Jan 2 days before the accident
Well if only Nissan allowed a set point for SOC, right?
But most of the time I have my timer set to well after I leave for work, so that when I unplug I'm around 70-75%. It is never the same each time for some odd reason but close enough. And I'll recharge when I get down around 35%. Sometimes 40% if a weekend is coming so I don't have to charge on the weekend, because inevitably I'll plugin and forget about it Saturday or Sunday morning and it would charge to full.
I'm still a believer that part of my problem is the heat here. I don't buy the idea heat has no impact. For one thing, even the BMS treats hot weather differently. During the winter that daily adjustment of 0.01 occurs only once a week, or even less. Right now I'm loosing 0.01 every day, yesterday morning it dropped 0.02. I think we all agree the BMS appears artificial. But even if the computer is artificially lowering my SOH faster during hot weather, then it means Nissan engineers programmed it to take away more during hot weather. Why would they do that? The most obvious reason is because hot weather degrades the battery faster. You are welcome to disagree but the fact remains the BMS takes away more during hot weather. That's a fact for my 2018. Now hopefully that will stop... but it hasn't yet. Last three month adjustment was basically nil so I'm curious to see what happens after the summer.
That is a good plan. I have seen a few studies that suggest the best shallow cycle range is actually a bit more than 50% so my "target" is 60% but I have a slightly shorter commute than what I normally replace on a daily basis so the SOC creeps up during the week so I end up anywhere from 55% early in the week to 70% towards the end.
I set mine to start charging at 4 AM and get up at 5:40, leaving at 7. So if I know the SOC will be high, I unplug when I get up or soon after. If its normal, I usually unplug around 6:30ish. If I plan to take a longer (much longer) detour that day, I will leave it plugged in until I depart.
Realize, I use barely 10% of my range on a straight to work, straight home commute (there are detours I commonly make but none add more than 2-3 miles to the distance traveled)
So right now, slightly more than half of my cycling is in the 50sih to 65% range. Generally if I get home with more than 50% I will sometimes skip a day
2011 SL; 44,598 mi, 87% SOH. 2013 S; 44,840 mi, 91% SOH. 2016 S30; 29,413 mi, 99% SOH. 2018 S; 25,185 mi, SOH 92.23%. 2019 S Plus; 11,333.1 mi, 93.73% SOH
My Blog; http://daveinolywa.blogspot.com
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