On May 8, 2015, at 4:11 PM, len moskowitz via EV <[email protected]> wrote:
> StoreDot promises electric car that charges in 5 minutes There's some industrial-grade technobabble in that article. Be wonderful if there's some substance to the claims, of course, but I'm not holding my breath. The racing crowd will certainly sit up and notice if it's true. A battery that can charge in five minutes can presumably discharge in five minutes, too. The obvious questions are the usual of how you're going to move that much current and where it's going to come from. They're talking about something on the order of a megawatt, far more than any residential outlet could even theoretically handle. Call it 5,000 amps at 200 volts -- an hundred times the beefiest circuit you're likely to find in your house, and far more than what your utility provides you at the meter. The only realistic option I can think of is to have two sets of batteries, one in the car and another in the charger. The batteries in the charger charge at whatever rate the wall outlet supports for however long it takes to fill them, and then they dump their charge into the batteries in the car at full speed. (And I hate to think of the connector you need to be able to not melt with that kind of current!) All that applies in spades for public charging stations. You'd need a substation-grade power connection plus an huge bank of similar batteries. That's gonna be a damned expensive capital investment, and that cost will get passed on to those charging there, driving down demand and thus jacking the prices even further...hard to see how it could be profitable enough to make business sense. b& -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 801 bytes Desc: Message signed with OpenPGP using GPGMail URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150508/ddf1d6c4/attachment.pgp> _______________________________________________ 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)
