Scaramanga wrote:I should like to point out that in January / February just after I took delivery of my '16 back in December (Happy Birthday to me!), my SOH% dropped to as low as 91% over a couple of months, I thought the whole thing was headed south, built a spreadsheet, got upset, etc.
I was only commuting 2 - 4 miles to work to the train station, and driving a bit on the weekends to Home Depot and such, still languishing in the 91 - 95% range.
Then my wife got a new job where I work in Bellevue and we've mixed up our commute to where sometimes I drive her and I all the way to Bellevue from Tacoma a couple times a month. About a 78 mile round trip on the freeway, in the HOV.
Lo and behold, my SOH% has returned to 100% and has stayed there for over a month consistently.
I don't know (okay I doubt) that the battery had just improved miraculously, it's likely just fat fingered instrumentation, but it's interesting from LeafSpy's point of view, the battery LIKES to be driven long distances where it starts at 100% full charge, get's driven at freeway speeds down to sub 20% and charged again on a timer the night before we take off again finishing at 100% within 20 minutes of departure.
Go figure, my spreadsheet has taken a u-turn and with less than 2k on the odometer things don't look so black.
As you well know, this is quite normal. The real question is do the higher numbers mean higher range? I have not found any evidence to the contrary as of yet. So wondering how those 200,000 mile Tesla's did it? Its because they were driven!
So why did the numbers improve? Well, part of the reason is your cells are better matched to each other. Cells balance ALL the time but if not full, there is nothing stopping top cells from continuing to take a charge and the balancing charge is very weak. But as cells approach the max voltage cut off, they stop taking a charge allowing lower cells to catch up much more effectively.
So short drives means shorter charging time and in most cases, less time for lower cells to balance with the higher cells. Longer drives means longer charging time, longer balancing time.
There is undoubtedly other forces at work here, but the results are very repeatable which I have reported on several times in my blog. Right now, I am at 100% after 19,000 miles and UNDOUBTEDLY because I am averaging 80+ miles per 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; 16,686 mi, 91.51% SOH
My Blog; http://daveinolywa.blogspot.com
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