I would think they would run power beside or under the road and run inductively
Sent from my iPhone > On May 14, 2015, at 1:21 PM, Ben Goren via EV <[email protected]> wrote: > >> On May 14, 2015, at 10:47 AM, Ben Goren via EV <[email protected]> wrote: >> >> dump pack > > Thinking this through a bit more...I'm not sure that it would make sense for > a rapid-charging station to operate without a substantial dump pack of its > own. > > Without one, you're left needing a grid connection able to meet your peak > demand, which will be truly insane. Imagine a not-too-distant future where > luxury EVs come with 100 kWh packs that people expect to charge in ten > minutes; that's over half a megawatt. Now imagine a convoy of such traveling > together on a road trip, all of them simultaneously pulling up to each of the > 36 slots in the station. No way is that station going to have a 20 MW feed > from the grid...that's about 5% - 20% of the output of a utility-scale > generating unit. And even the utilities themselves would have problems > running such a facility because of the sharply peaking nature of the load. > > But if, on average over the course of a day including times when all slots > are empty, the station only "sees" one or two stalls in use at a time...well, > a megawatt utility connection is still pretty freakin' huge -- 1 kV @ 1 kA, > or however you want to balance the two -- but much more manageable. You'd > keep a constant rate (or, perhaps, varying per utility feedback but averaged > to a constant) of charge going into your massive dump pack, and each of the > slots would feed from the dump pack, rapidly depleting it for just a short > period of time as the grid constantly trickle-fills it back up again. > > Again...the scale of such operations pretty much demands that they be > insanely expensive, especially compared against a 110V / 15A overnight charge > that'll more than satisfy almost all of almost everybody's needs once > vehicles can reliably get over 200 miles on a full charge. > > 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/20150514/b3cbd469/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) > _______________________________________________ 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)
