Probably none of (a) to (e)... and most likely it isn't really that high a drain, it's just that the range computing is more art than science and the active thermal management of the battery pack is using a fair amount of energy during a cold night to keep the pack warm and toasty ready for an immediate off at any time.
If anything, Tesla should look at providing a facility to minimize the pack warming when not required... if they don't already. Regards, Martin Winlow Herts, UK http://www.evalbum.com/2092 www.winlow.co.uk On 18 Feb 2013, at 09:22, Lawrence Winiarski wrote: > (data here > http://www.teslamotors.com/blog/most-peculiar-test-drive > > and original review here > http://www.nytimes.com/2013/02/10/automobiles/stalled-on-the-ev-highway.html?_r=1&pagewanted=all&; > > > > > So I'm not saying the NY times guy wasn't an class A-one jerk. It's pretty > obvious he wasn't being careful > and actually seemed to want to wreck the car. (I had roomates (actually > Intel engineers) do similar > things to an old restored vehicle of mine. Some people (even educated) turn > into infantile sociopaths when you let them > operate some piece of machinery that they aren't held accountable for, And > unfortunately you usually learn > it too late after they've done considerable damage. > > However, I'm not willing to let Tesla off the hook, just because they had a > jerk reviewer. They've also > got a problem that they should address. > > If you look at Musk's data, you see a peculiar vertical line at 400 miles in > showing the range decreased > from around 80 miles remaining to around 20 miles remaining overnight.. So it > lost 60 miles of estimated > range. (roughly 25%) but if you look at the S.O.C. it only lost about 7%. > Furthermore if you look at > the last charge at the members-only coffee shop, you'll see that he charged > about 5% of his charge back > (roughly). Furthermore the car went around 80 miles. Virtually every line > in the S.O.C .vs. miles shows > very nearly the same slope. So I'm not buying this is a cold weather thing > as far as driving is concerned. > > Point being that the car lost about 7% of it's S.O.C. overnight in roughly 12 > hours. That's a drain of > 7%*85kwh = 6kwh/12 hours = 500 watts. That's pretty big. > > Does the Tesla REALLY use that when parked? That just seems ridiculous. I > could see several possibilities > (a) It does use this much power (uggh) ...(perhaps the logging equipment > stayed on?...DC-DC converter inefficient) > (b) It has a very bad problem with self discharge > (c) The amp shunts sucks and they can't measure low currents with accuracy. > Kind of a problem in any electric car. You > have to be able to measure nearly 1000 amps (at peak power) but then measure > 0.01 amps over long periods of time to measure > the S.O.C. > (d) BMS guessing game?. > (e) all of the above? > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130218/01b2db71/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
