Is tesla still using 6800 or so of 18650 itty bitty cells in their on road vehicles like the S and model 3? Do they use these small cells in their Tesla Wall home UPS packs as well? I wonder if they'll continue these small cells at their giga factory in Reno since *no* other manufacturer is doing so. Best regards Mark
Sent from my iPhone > On Apr 10, 2017, at 4:04 PM, via EV <ev@lists.evdl.org> wrote: > > Send EV mailing list submissions to > ev@lists.evdl.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > or, via email, send a message with subject or body 'help' to > ev-requ...@lists.evdl.org > > You can reach the person managing the list at > ev-ow...@lists.evdl.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of EV digest..." > > > Also, please be careful not to append the entire digest to your reply. Many > mail systems do this by default. Trim or delete the digest text from the > bottom of your message, and quote only the parts to which you're replying. > > > > Today's Topics: > > 1. Re: EVWest Tesla Module Prices? (tomw via EV) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 10 Apr 2017 09:54:12 -0700 (PDT) > From: tomw via EV <ev@lists.evdl.org> > To: ev@lists.evdl.org > Subject: Re: [EVDL] EVWest Tesla Module Prices? > Message-ID: <1491843252861-4686360.p...@n4.nabble.com> > Content-Type: text/plain; charset=us-ascii > > Iirc in the 85kWh pack there are 16 modules, each module has 6 series > connected groups of 74 cells in parallel, so full charge of one module is > 6*4.2V = 25.2V, and capacity is about 240Ah. Most modules seem to go for > around $1200 when sold by individuals, and they usually tell you the year > and mileage of the vehicle they were taken from. Might be more cost > effective to buy a wrecked Tesla S with low miles since there seem to be > ample buyers for the drive train, the value of the glass, and scrape value > of the aluminum body should be considerable, and you could sell the modules > you don't use. > > There are two difficulties with Tesla modules imo: > > 1) The larger the unit size the more difficult packing different battery box > volumes becomes. These are quite large, module length with cooling tubes is > 26.75", width is 11.8", generally resulting in inefficient use of volume. > > 2) The larger the voltage unit, the less flexibility in pack voltage due to > limits of controller/motor max/min input voltage. Voltage of these is quite > large, 25.2V full charge. So for example 7 modules in series > exceeds max voltage for the Curtis 144V AC controller with max 170V input > since at full charge they would be 176.4V, although if you give 20 min or so > after full charge for the cells to "relax" in voltage before closing the > contactor to the controller it shouldn't be an issue, and much of the time > you could just do a partial charge. Six modules do not make full use of the > voltage range of the controller, limiting peak power. Higher voltage motors > that require > 300V have a different problem in that they require many of > these modules in series, making it difficult to fit enough modules in a > converted vehicle to supply the required voltage. > > -- > View this message in context: > http://electric-vehicle-discussion-list.413529.n4.nabble.com/EVWest-Tesla-Module-Prices-tp4686358p4686360.html > Sent from the Electric Vehicle Discussion List mailing list archive at > Nabble.com. > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > EV@lists.evdl.org > For general EVDL support, see http://evdl.org/help/ > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > > > ------------------------------ > > End of EV Digest, Vol 54, Issue 11 > ********************************** _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
