I use a 3 phase 11 kW AC charger that is connected to wifi. I can start and stop charging with my phone. I can also adjust the timer (start/stop) and the current settings remotely.
Thanks-- I did try that out the other day and saw the charge graph on my juicebox that the car charged the way you described! I had assumed "charge in timeslot" meant it would start charging as soon as the timeslot opened which is also how I would have programmed it. Or, maybe charge up to 80% ASAP, then wait until the last minute to fill up the rest of the way. Or, assume the car would charge during the whole window and lower the rate to reach 100% at the very end (assuming that lower current is better for the battery life).agzand wrote: ↑Tue May 17, 2022 8:51 pm You set departure times (up to three, for different days of the week). Make sure departure times are selected. Then you select "charge in time slot", instead of "charge immediately".
I use one departure time for weekdays (9 am), and one for weekends (11 am). These two are always active. The third departure time is set for early morning (6 am tomorrow) and usually deactivated. I activate it when I need to go out early to a job site. On weekdays usually I leave before 9 am, so the car is around 90% when I leave.
You can also set it on myBMW app. Again departure time works only if you charge in time slot.
This is interesting because my understand of L2/ J1772 is that the state of charge for the car is not communicated to the EVSE like it is over CCS. So it would be impossible for the L2 station to know when your car hits 80%. However, it would also seem like a trivial bit of code to add an option that essentially says: as soon as the car starts lowering it's requested current, assume it's around 80% and shut off the charge.
This actually would also be interesting to do in hotter climates to get an idea for how much juice the battery cooling uses. Chilly days you might charge up to 80% whereas the same calculation on a hot day might be closer to 75%.Star63 wrote: The most valuable feature to me is the capability to determine the amount or "dosage" of charge in kWh. You very quickly learn how many kWh you need to charge up to 80% or so. Quite satisfied with this
Just saw this. Gotcha and thanks.eNate wrote: ↑Sat May 28, 2022 7:46 am I always hesitate before replying to the 100% threads because BMW says to do it, and gives us no useful tools to stop the charge.
But I have point out that, as you say you don't drive much, about the worst thing for a battery is to store it at a full or depleted state of charge. I'm not making the distinction between 100% and 94% but talking 70%.
And to be clear, 199 miles on the GOM isn't an indication of a battery's health, it's representative of a car that's been driven conservatively and efficiently – so good job there! – but I wouldn't expect to see any ill effects on a '21 anyhow.
I get it, especially with a lease and no skin in the game. But for somebody planning to hang on to their i3 for the long term, observing what's essentially industry standard charging norms isn't a guarantee of anything, but is simply cheap insurance for a long and bountiful battery life.
I limited charging in our 2014 BEV for more than 7 years yet the mi3 app has always reported almost no charge level, voltage, or capacity differences between the weakest and strongest cells in each of these categories. Is there any reason why passive cell balancing couldn't occur below 85% absolute charge level? I can understand why cell balancing would be slower at lower charge levels because of lower cell voltages, but with the goal of passive cell balancing being to equalize cell voltages, it would seem that this could occur at any charge level.
I have generally followed this advice even though the i3 Owner's Manual offered different advice. The new advice agrees with what Li-ion battery cell experts generally suggest for minimizing cell degradation.
Maybe the experience of many 60 Ah i3 owners whose battery packs have lost significant usable capacity has resulted in BMW changing its recommendations to agree with experts.