islandbayy
Active Member
Ive charged my 60 to 100% every day for the last 2 1/2 weeks. My rated range went from 199-202 to 208. Yes, I do cycle my battery low a lot, and no, I don't leave it sit long periods at 100%.
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The only time it is actively cooled down is when it reaches a dangerous temperature which is when you drive very hard or when you charge at a Supercharger.
I interpreted his comment as meaning two hours total at the supercharger...so probably an hour or so at or near 100%.
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This is true. My personal experience has been:
With my 2012 S85, I frequently charged to 70 or 80% max, and with this saw my max rated range drift downward. Granted, I still believe the overwhelming majority of this was not real battery degredation but either imbalance or algorithmic issues.
With my 2014 P85, I charge to 90% 5 days a week. Doing this, my 90% charge has remained at or above 236 miles for all of the 13,500 miles on the car--and I rarely Supercharge or charge to 100%. If I were to do that once or twice a month, I'm pretty sure it'd be higher.
Anecdotally, it seems to me that some level of balancing happens at 90%. Charging daily to 90% seems to prevent the downward drift in rated range, whereas charging to 80% means your rated range drifts downward. But again, only Tesla knows--and why they don't publically state how this behaves is puzzling to me--especially given that they've now essentially opened up all their patents.
I'd LOVE to hear JB discuss balancing sometime. It would probably put this entire thread to bed.
The only time it is actively cooled down is when it reaches a dangerous temperature which is when you drive very hard or when you charge at a Supercharger.
That's not entirely true. My car actively cools itself while charging at 80A on my HPWC in the garage.
I wonder if they've changed the algorithm in recent FW versions. I caught my car cooling during HPWC charging a bit back... first time I can ever recall that happening in the 2 years I've owned it.
This was for two hours at a Supercharger. I've let it run for about 4 hours at work on an 80 amp J1772 station (I have dual chargers) with the same result of never stopping. I either run out of time and have to leave or, honestly, get a little freaked at it throwing that much current for so long into an apparently full battery.
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I did 70% to 30% most of last summer and lost about 25 Rated miles of range when I eventually did a full charge. After that, I started doing 90% regularly and got about 5 miles of range back.
May just bite the bullet and let it run all night at 100% and see what happens :scared:
Doing a full cycle on the battery (going from one end to the other) sort of re-calibrates this calculation. Tesla actually explained that in an official email. So charging to 100% after a long period of time of only partially charging it will recalibrate the range prediction. I don't know why so many people insist on saying it's balancing when Tesla specifically said it's a calibration issue and at the same time never mentioned anything about balancing.
I'm actually quite surprised that mknox says his car isn't turning on the fan at superchargers. Both of mine do/did that reliably. Every time I charged for more than a few minutes.
So in fact what it's starting to look like is that if you baby the battery your apparent range loss is bigger than when you regularly use it fully
My first experience with Superchargers was on a trip to Chicago last summer and I paid very close attention as I was expecting the fans/pumps/cooling system to come on... but nothing. It wasn't "hot" but temps in the mid 70's. Now that we have a few Superchargers closer to home, I've noticed the same thing here. In fact I supercharged twice last weekend and the car just sat there quietly. I do have an A-pack battery that can't charge as fast as newer packs. I wonder if this is why?
Don't think so.... our A pack will have the fans turn on at SC when hot out. We see temps at the Gilroy SC in the 90- 100 degree range in summer (air temp) and no shade on the asphalt. At home, it will be 55 degrees (yes 45 miles away) and only rarely hear the fans while charging.
Tons of factors play into this. Random luck, apparently. How often do you do 100% charges? How often do you draw it down to below 20% (or so)? What are the temperatures where you live? How many miles in those 5 years?P85D with rated range of 250 miles at 100% SOC; 224 miles at 90%. I've lost a few miles over the 5 months I've had it. I'm guessing this is typical but it seems like others are reporting a bit more range. Am I within spec?
Tons of factors play into this. Random luck, apparently. How often do you do 100% charges? How often do you draw it down to below 20% (or so)? What are the temperatures where you live? How many miles in those 5 years?
I get 229-230 at 90% on mine, so 224 is about a 2% loss. That seems entirely within the bell curve that has been reported...
Oddly, my car is completely silent at Superchargers. At home, on the odd occasion, I'll hear a pump and/or fan but at a seemingly very low setting.