valem wrote: ↑
Mon Aug 12, 2019 5:43 pm
"SOH values artificially low due short drives and charging only to 80% ?"
This is a very old post, but is this for real?
Does that mean that you can "artificially" lose capacity bars because of frequent partial charges rather than charging to 100% ?
So if you charge to 100% you lose SOH because you charge too high, and if you do partial charges and short drives you lose SOH because you do partial charges ?
Wait what ?
No. I'm talking about the behavior of the value SOH that Leaf Spy can render if charged only to 80% or less and run down partially vs. charging to 100% and doing deeper discharge cycles. To me, the deflation vs. inflation is just an instrumentation quirk.
Please see https://www.mynissanleaf.com/viewtopic. ... 11#p516611
for background about SOH and Hx.
AFAIK, Nissan has never acknowledged nor released any documentation on anything that Leaf Spy can render along with its caveats (e.g. precision, what conditions it's accurate/more or less accurate in, etc.)
Does SOH corresponding with battery capacity? Maybe... probably? We know it starts out high and tends to go down over the long term as the battery degrades. We know there's some rough correspondence between a given SOH value (or other values like AHr) vs. capacity bars but it is unknown exactly what criteria are used for a capacity bar to go away.
How accurate is SOH (or AHr or Hx)? How much of a fluctuation should we be concerned about? What about the above quirk? Who knows? Nissan hasn't told us. For all we know, they might have some internal procedure that says battery must be between x and y temps, must be charged to 100% and discharged to x% y # of times, etc. and that the accuracy is +/- n%.