So, how does the car computer know when the battery is discharged? I can
understand the estimated range might be affected by not doing a full
discharge occasionally. But what about the bars or other state of charge
reading? Is that determined also by an amp-hours in, amp-hours out
comparison? If so, and it shows 1 bar left, how do you know if you can
keep driving for a while before the voltage gets too low and it shuts
off?
Peri
------ Original Message ------
From: "Robert Bruninga via EV" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: 05-Oct-16 2:28:33 PM
Subject: Re: [EVDL] Best charge rate for longevity (not guessgauge)
Depends on what you mean. If you mean to never charge until you always
get down to 10%, then that is a bad idea. But if you are meaning to
always charge (top-off) after every use, and then *occasionally* do the
discharge to 10mi followed by a full charge, then absolutely, that is a
best way to do it.
The frequent topping off maintains the longest possible battery life,
but
at the "cost" of slowly having the car computer loose track of actual
capacity since it rarelyl sees a deep discharge and so loses track of
whre
the "bottom" really is. That's why the recommendation to
occasionally
discharge down to 10% so that the CPU re-learns where the bottom is and
can re-calibrate the GUEGAUGE...
I had this discussion with a Nissan Battery engineer who just happened
to
sit next to me on the plane. He said the reason the car MANUAL says to
not frequently top-off but to only charge when the battery gets low is
not
so much to protect the life of the battery, but so that their PUBLIC
RELATIONS staff is not deluged with onwers complainng all the time that
the guessgauge told them 62 miles when they only got 61, etc...
By making sure the users were charging from a low state, the guessgauge
can do a more accurate job. (at the cost of long term life)...
Bob, WB4aPR
-----Original Message-----
From: EV [mailto:[email protected]] On Behalf Of Rush Dougherty
via EV
Sent: Wednesday, October 05, 2016 5:15 PM
To: 'Mark Hanson'; 'Electric Vehicle Discussion List'
Subject: Re: [EVDL] Best charge rate for longevity
Or you can follow the advice of an engineer from Tennessee that Tom
True
talked to - "The final recommendation from him was to discharge the
pack
to 10 miles or so in range (according to the instrumentation), and
fully
recharge about once a month to "refresh" the battery"
Which totally contradicts what the engineer said in the sentence
before, "
Explaining that if you let the battery pack get below 10%, it would
typically brick (not allow a charge), and above 90%, that your could
experience a thermal even ( Thermal runaway & fire)."
Confusing, right?
Rush Dougherty
Tucson AZ 85719
-----Original Message-----
From: EV [mailto:[email protected]] On Behalf Of Mark Hanson
via EV
Sent: Wednesday, October 05, 2016 1:34 PM
To: Electric Vehicle Discussion List
Subject: [EVDL] Best charge rate for longevity
Thanks folks
So if the Leaf charges at the 100% setting to 4.12vpc and 80% to
4.05vpc and
battery
university says max life of 2k cycles is at 4.00vpc then I should
change my
charge cut off at
80% for daily short trips of 15 miles typical. Plus since balancing
occurs
all the time there's
no need to charge at 100% except for long trips Best regards Mark
Sent
from my
iPhone
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