It seems to me that most BMS algorithms don't allow either full charge or
full discharge. They reserve capacity for longer life, and to use as the
battery degrades.
Our Zoe has a ~56kWh battery with 52kWh usable, so about 4% is reserved.
Our garage is freeze and heat-wave resistant, usually 14-22 deg C year round
(thick stone walls), so that's good for the battery. I still don't like to
let it sit at 100% (~97% actual) for longer than necessary.
Normally we just charge to full the night before we take a longish trip.
If the car gets down to 20-25% in shorter trips, I charge to between 80 and
90%. The car has no option for such, so I manually stop the charge around
2h before the guessometer thinks it will be full.
As I understand it, equalization only happens at 100% indicated. We do that
at least once a month, so I'm not too concerned. (Other opinions?)
Zoe has going since 2012 and there are lots of examples of older ones
retaining 90-98% of factory capacity at well over 100,000km, with no special
treatment. I suppose that with the Bolt you don't have quite as long a
history to look at.
Recently I read of a 2017 Zoe used in taxi service that was at 96% capacity
at over 350,000km. Taxis don't sit at 100% for any length of time so I'm
sure that helped.
That would have been with LG E63 LiPo cells. Our 2020 cells are LiNCM, LG
E78, 192 of them, 78ah each. I don't know what difference the chemistry
will make, if any..
This scheme might not work for you since you seem to put lots more miles on
your EVs than we do, but I suspect that it's possible to overthink these
matters. And hey, you'll soon have a nice new battery, no? Congrats on
getting your stealer to cooperate.
David Roden, EVDL moderator & general lackey
To reach me, don't reply to this message; I won't get it. Use my
offlist address here : http://evdl.org/help/index.html#supt
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you do.
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