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Never ending Supercharge?

I've noticed a few times now on road trips that Supercharges take forever to finish. The battery will get to its maximum (a mile or two shy of its published maximum by the way) with the mention "calculating time remaining" and just seems to sit there. Except once shortly after I got the car in March, I've never had the patience to let it finish and just drive off. I understand a Supercharge slows down quite a bit towards the end but is this what you're experiencing too? My range charges at home do end up finishing though I don't monitor them as much (mostly overnight charges) and can't say if they get stuck on the 'calculating time remaining' mode.
 

stevezzzz

R;SigS;P85D;SigX;S90D;XP100D;3LR;YLR
Nov 13, 2009
6,100
122
Colorado
Totally normal, steilkurve. No matter the maximum charge rate of the charger you're using, the rate declines asymptotically to zero as the battery nears 100% SOC. It's just more noticeable at a Supercharger since the initial charge rate is so high.
 

manis

Member
Jun 12, 2015
90
3
Bay Area, CA
From what I've read, and after talking to someone that knows quite a bit about all of this, it is balancing the batteries and adjusting algorithms. There are threads about this, but by letting it sit and having them balance out the car will know more and you will see a very small increase in your estimated range. When I first got my car I did this. Originally I would see 226mi @ 90%, and after balancing I would see 228mi

As far as the time it takes to finish. I watched the entire time and I saw it go from 5min left at 99%, hit 100%, then it sat for another 35 minutes going back and forth between 5 minutes and checking remaining time.
 

dsm363

Roadster + Sig Model S
Moderator
May 17, 2009
18,279
160
Nevada
I've noticed a few times now on road trips that Supercharges take forever to finish. The battery will get to its maximum (a mile or two shy of its published maximum by the way) with the mention "calculating time remaining" and just seems to sit there. Except once shortly after I got the car in March, I've never had the patience to let it finish and just drive off. I understand a Supercharge slows down quite a bit towards the end but is this what you're experiencing too? My range charges at home do end up finishing though I don't monitor them as much (mostly overnight charges) and can't say if they get stuck on the 'calculating time remaining' mode.

Do you need the 100% range for these Supercharge sessions you're doing? As others pointed out you'll save time taking off at 80-90% or so. If you need the range then of course charge to 100% but that last 20% takes a long time.
 
Do you need the 100% range for these Supercharge sessions you're doing? As others pointed out you'll save time taking off at 80-90% or so. If you need the range then of course charge to 100% but that last 20% takes a long time.

Good point. A lot of times I'll need that 100% as I drive to destinations with limited charging options but in other cases, I can get by with 90 or even 80. Thanks.
 

TexasEV

Well-Known Member
Jun 5, 2013
7,650
8,914
Austin, TX
From what I've read, and after talking to someone that knows quite a bit about all of this, it is balancing the batteries and adjusting algorithms. There are threads about this, but by letting it sit and having them balance out the car will know more and you will see a very small increase in your estimated range. When I first got my car I did this. Originally I would see 226mi @ 90%, and after balancing I would see 228mi

As far as the time it takes to finish. I watched the entire time and I saw it go from 5min left at 99%, hit 100%, then it sat for another 35 minutes going back and forth between 5 minutes and checking remaining time.
If you want to do this, let the car do this at home overnight, not at a supercharger. It's not certain that battery balancing even happens when supercharging, but even if it does and assuming the other stalls are empty, is that how you want to spend your time on a road trip?
 

SW2Fiddler

We Are Cognitive Dissidents
Mar 19, 2014
2,362
3,272
Houston TX
Totally normal, steilkurve. No matter the maximum charge rate of the charger you're using, the rate declines asymptotically to zero as the battery nears 100% SOC. It's just more noticeable at a Supercharger since the initial charge rate is so high.

ImageUploadedByTapatalk1439649463.005575.jpg


No Dr. House, Steve's right. Not worth waiting for the last few % as the Supercharger amperage tapers down below what a Level 2 charger can supply.

If you want to do this, let the car do this at home overnight, not at a supercharger. It's not certain that battery balancing even happens when supercharging, but even if it does and assuming the other stalls are empty, is that how you want to spend your time on a road trip?

I don't like "+1" posts much, but in this case I really want to say +1 !!
 
Last edited:

manis

Member
Jun 12, 2015
90
3
Bay Area, CA
If you want to do this, let the car do this at home overnight, not at a supercharger. It's not certain that battery balancing even happens when supercharging, but even if it does and assuming the other stalls are empty, is that how you want to spend your time on a road trip?

Wouldn't the concern doing this overnight be that it would sit at 100% too long? I totally understand not doing it on a road trip because it is a huge waste of time.
 

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