On 1/14/24 20:39, (-Phil-) via EV wrote:
Yeah, My procedure is to charge to 75% overnight normally, or higher if
needed. 3-4 times a year I need to take a road trip, so I charge to 90%
overnight, then 2 hours before I am about to leave, I'll take it to 100% to
give it time to balance. (I have ternary/NMC not LFP) The pack doesn't
sit too long at 100% when you hit the highway.
You really don't need to worry too much about balance unless you see a drop
in range, then do a balance, and if you get some range back after a week or
so, do it again and ad nauseum until you don't see any gain. I think
doing it a few times a year does a pretty good job of keeping it in-check,
but all packs are different, so YMMV.
I recently pulled my 2013 S85 (~170k miles) back from being loaned out.
The person using it rarely took longish trips and tried to keep it
charged daily to 90%. Probably above 50% most of the time. That is how
it was treated for a couple of years. It was about 150 miles distant
from my home; the trip home had several SuperCharging opportunities but
I decided the extra charging would not be needed. About 15 miles from
home, with estimated remaining range of 29 miles, the car abruptly ran
out of energy. I ran the 12 v down while messing around trying to tow
it home with a rope. Eventually, I got it flat bed towed (expensive 15
miles). Eventually got the 12v going and charged up the traction
battery. Everything worked semi-well. With some trepidation, I tested
the range estimate by driving ~8 mile circles around my house. I got it
down to zero. Indicating that the range estimate was again semi-accurate.
Incidentally, Tesla replaced several lead batteries approximately
annually. When Tesla started demanding payment for 12v replacement, I
put a LFP in. That 12v has been trouble free for about 5 years.
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