Jan 3, 2013
PRJIM Several Tesla Roadster owners have been doing this for years- without repercussion. This is not our first time at the rodeo.�
Jan 3, 2013
JRP3 Not to mention that all the cells wired in parallel are treated as a single large cell and don't really get individual treatment.�
Jan 3, 2013
stopcrazypp There is this for the Volt:
http://gm-volt.com/forum/showthread.php?5243-Volt-thermal-management-system-temperature-band&p=48601#post48601
Granted it's not an official chart, but it was compiled from information made public by GM and GM engineers. We need a similar chart here.�
Jan 14, 2013
wycolo Same situation again today: 4*F '56' miles on speedo. Been plugged in @117v for days straight. Can't get it to resume charging, even by switching to RANGE from STANDARD which worked yesterday. Unplugged & took a spin around the lot in the snow- great fun. Parked & plugged. *Now* it begins a charge 117v 12A, estimate 12+ hours. Go out less than 2 hours later it shows 216 miles on speedo!! As I suggested in yesterday's post in other 'cold' thread, the '56 miles' is BOGUS value derived from deep sleep or ?? Should we call this the 'Memorex Range'? It sure ain't real. Say I want to take a 120 mile round trip to the City. If I guess that the '56' really means '212' then I'm golden. But if it ain't, I'm screwed.
Tell me where to hook up the 440v voltmeter (bluetooth?) then I can reference the nominal SOC. As experience increases relating Voltage to SOC we will be able to do our own correlations, thank you. Any remote sensing voltmeters to recommend? I've got little power-socket 12v DVMs on order to monitor the LV batt; this would nicely flesh out the Control Panel. Can't have too many voltmeters, esp in an electric vehicle.
Workaround would be to go outside in early morning a couple hours before take off & repeat the unplug, turn ON car, move the shifter thru the gears, re-plug, initiate charge routine. I could hit ENVIRONMENT so the car (& batt?) would be warmer, maybe with some REGEN by the time I left. This is doable.
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Jan 14, 2013
tezco Some owners have reported reduced charging rates if the charging cords aren't completely seated in the charging port.�
Jan 14, 2013
stevezzzz Ah, thanks for that, tezco.
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Just a guess: a temperature-induced voltage drop on the pack is being interpreted as a lower SOC than is 'real'?�
Jan 15, 2013
VolkerP Yes, sort of. At lower pack temp, much less charge can be extracted from the cells. The car heats up the pack, making consumption values skyrocket for some time, but then a much more realistic range value is displayed. Check the winter driving experiences from Doug_G.�
Jan 15, 2013
neroden It seems absolutely clear that this is happening. Unfortunately, it's hard to separate this out from the actual loss in charge in the cold, since that seems to be happening too. I wonder if Tesla can come up with a method to report the "frozen pack" situation properly on the screen.
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THIS. Compute how long it will take to recharge the battery from "storage level", using some sort of worst-case scenario, and then let the car drop to storage SOC until that many hours before the "scheduled use time". Trickle charge it to maintain storage SOC. This seems relatively straightforward to program, if Tesla employs high-quality programmers. (If not, my consulting rate is $100 an hour. And I'm slow. ;-) )�
Jan 15, 2013
JRP3 Should not be that hard, they should have a temperature compensation algorithm to adjust SOC readings in relation to voltage at X degrees.�
Jan 15, 2013
wycolo >>> Just a guess: a temperature-induced voltage drop on the pack is being interpreted as a lower SOC than is 'real'? [stevezzzz]
>> Yes, sort of. At lower pack temp, much less charge can be extracted from the cells. The car heats up the pack, making consumption values skyrocket for some time, but then a much more realistic range value is displayed. Check the winter driving experiences from Doug_G. [VolkerP]
> It seems absolutely clear that this is happening. Unfortunately, it's hard to separate this out from the actual loss in charge in the cold, since that seems to be happening too. I wonder if Tesla can come up with a method to report the "frozen pack" situation properly on the screen. [neroden]
Strange that the Roadster sits thru this cold period exhibiting the usual mileage estimates, no weirdness. We had a 3-day warm spell into the 40s daytime & about +15*F at night, then 2 nights of -10*F (no more than 10*F in the day), then 0*F last night (18*F daytime peak). Expecting 10*F tonight & warming the next few days.
Good to know my S hibernates completely during serious cold. Makes no attempt to maintain battery temp until it is unplugged & then plugged back in. I'm curious to retrieve kwh usage records during next cold snap. With NO tech pkg this car might not be able to.
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Mar 6, 2013
vfx EXCLUSIVE Interview With Elon Musk on How Model S Manages Cold Weather�
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