I think if you consider the complexity and the feature level (over-the-air status inquiry and even software download requires that there is an always-on transceiver in the vehicle; most new cars have several dozen computers, the majority of them only powered while driving, but there are plenty that need to stay on for all kinds of tasks, from touchless entry to monitoring programmed tasks and maintaining status, keeping an eye on temperature and charge level and so on and then the power that the BMS of so many cells will take - even if at every level only a fraction of a Watt is consumed, with so many cells it adds up...
Apparently they were able to put a couple more computers to sleep that were kept in a high level of standby to start fast, now the driver may need to wait a few seconds before driving away due to the computers not ready yet. In design, everything is a trade-off. Cor van de Water Chief Scientist Proxim Wireless Corporation http://www.proxim.com Email: [email protected] Private: http://www.cvandewater.info Skype: cor_van_de_water Tel: +1 408 383 7626 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of zeke Yewdall Sent: Thursday, January 03, 2013 9:03 AM To: Electric Vehicle Discussion List Subject: Re: [EVDL] EVLN: Tesla Software Update Returns More Miles Per Charge So, if they are losing 8 miles of range a day, that roughly translates into 100 watts of draw just sitting there, "off". That seems like very poor electronics design to me. Z Sent from my iPhone On Jan 3, 2013, at 9:49 AM, brucedp5 <[email protected]> wrote: > > Reduce parasitic losses when parked & not plugged in > less bricking > > http://www.technologytell.com/in-car-tech/903/tesla-software-update-retu rns-more-miles-per-charge/ > Tesla Software Update Returns More Miles Per Charge > by Lyndon Johnson Dec 29 2012 > > Tesla Motors released a software update for its Model S EV that should see > the cars waste less of their batteries' juice on parasitic losses, thereby > allowing owners to eek out a little more range between charges. (Photo > courtesy Tesla Motors.) > > Tesla released a software update for its much-praised Model S electric car > recently that should help owners eek a few extra miles out of each charge of > the car's batteries. > > According to CleanTechnica, the Tesla Model S loses about eight miles of > driving range for every day it is parked without being plugged into a > charger. That equates to 56 miles per week or 240 miles per month. In the > Model S with the larger 80 kWh battery pack, this means the Tesla loses > about 2.6% of its charge every day it is parked off-charger. And as The > Green Optimistic notes, if you park a fully-charged 40 kWh Tesla Model S for > a month without plugging it in, it will be stone dead. > > The loss comes from parasitic drain, something common to most electronic > devices nowadays, from your DVD player to the computer or mobile device > you're using to read this. Much like those devices, the Tesla Model S > doesn't truly turn all the way "off" when parked. Some battery power is used > to maintain settings of the car's electronic features, including the > touchscreen center stack and electronic instrument panel. > > According to Tesla's notes on the software update release, "With this > release, Model S will power off the display and vehicle electronics each > time you exit, transitioning to a 'sleep' state. When you return to Model S, > you'll note a modest increase in the time it takes the touchscreen and > instrument panel to wake from this energy-saving state. Model S will > initiate the startup process the moment the key is recognized nearby. You > can only begin driving once both displays are ready." > > The change will reduce parasitic losses in Teslas parked without access to > charging facilities. However, if you're the type to store your keys in or > near the car, you may not see any benefit, as the car will "wake up" from > its "sleep mode" when it detects the key is nearby. (And hopefully if you're > keeping your keys in your Tesla Model S, said Model S is securely locked > away in a private garage, for your sake!) > > While some sources referenced a press release on the software update, a > Tesla Motors media contact said no such press release was issued and > suggested instead that the details came from software release notes issued > to owners to explain to them the features of the software update. > > Like all Tesla software updates, Tesla owners should expect the update to > download to the car's system anytime the car has reliable 3G or WiFi > connectivity. Installation of the updates- which will "brick" the car and > make it unusable for a short period of time- can be scheduled to take place > at a later time when the owner is sure the car will be parked for a long > stretch. > [(c) 2012 GadgeTell] > > > > > For all EVLN posts use: > http://electric-vehicle-discussion-list.413529.n4.nabble.com/template/Na mlServlet.jtp?macro=search_page&node=413529&query=evln&sort=date > > Here are today's archive-only posts: > > EVLN: $600k ebuses for Apple, LAX & Stanford U. r:155mi ts:100kmph > EVLN: Edison2 has developed an electric car rated at 245mpge > EVLN: Electric Scooters From ZEV > EVLN: 2012 EVs and pih That Will Change Tomorrow > + > EVLN: 2013 smart fortwo electric drive, 1st Impressions 0-100kph:11.5s > > > {brucedp.150m.com} > > > > -- > View this message in context: http://electric-vehicle-discussion-list.413529.n4.nabble.com/EVLN-Tesla- Software-Update-Returns-More-Miles-Per-Charge-tp4660323.html > Sent from the Electric Vehicle Discussion List mailing list archive at Nabble.com. > _______________________________________________ > 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) > _______________________________________________ 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) _______________________________________________ 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)
