brainhouston
Active Member
yeah i read some horror stories here that ppl either didn't have the buffer or car died with few % showing so im hesitant to try, but i might somewhere around the known place to charge...As you noticed with the 11% to 2% drop, there are *not always miles below zero*, particularly if your pack has bad balance. It's often the case that there are more miles, but on an out of balance pack zero can really mean zero, or 2% can mean zero. When trying to balance a pack, assuming you can drive after zero is rolling the dice on needing to wait by the road for a flatbed, and it doesn't do you any good in terms of balance to get that low. It's also not really necessary - more on that later.
maybe for non-balanced pack but for good pack i disagree.It's far more damaging to leave the pack at 0% than at 100%. If you follow this advice, don't sweat the time at 100%, it's no big deal even for a few days. Do charge as soon as possible after getting down close to 0%, as if there is any chance the car sits and gets down to the bottom of the buffer it's a big problem. If the car ends up not getting charged for a while at 0% it can do serious long term damage to the battery, particularly if the pack is significantly out of balance. Time at 100% accelerates calendar aging but even a few weeks spent at that level is very little aging in terms of the overall life of the pack. If you will drive within a few days, no need to run the pack down after charging it to 100%, just take care of it with your next drive.
my car was wrecked n came fully dead. it sat for 3mo at auction. i don't know for sure when it died but good guess it was a long while.
after charging it n driving it for 7k mi now, it seems fine.
i think the buffer does its job saving the pack when its at 0
Not in my experience...Even just daily charging to 90% and occasionally taking the car down to 20% will give the system far more data to work with on current SOC of individual cells.
I did do 90-20(occasionally to 15%) for 7k miles n SMT always showed 74kWh
Only after i did 95% few times it re-adjusted
FYI, on the fourth 95% charge, MCU showed a warning that charging above 90 will degrade battery.
Curious if there's a warning going very low...