Dear Peter, You said, "Cable theft is a primary reason for wireless power transfer. " You didn't say how much you're cure (Wireless is not free)Versus Mine costs? a cable with two connectors and white grips for summer comfort and aluminum plated with copper on each strand of wire (A product being already produced!) eliminates the profit in stealing the wire... What possible reason for having a wireless charging pad in your garage except, "Sloth!" and what if you park outside the garage door in the driveway? You cannot charge wirelessly there, but a cable is 20 ft long and offers flexibility... With, I think, a much lower cost, higher reliability, and efficiency(at least 20% more efficiency !)
Dennis Lee Miles (EVprofessor) *Founder: **EV Tech. Institute Inc.** (www.evti.org <http://www.evti.org>) * *E-Mail:* *evprofes...@evprofessor.com* <evprofes...@evprofessor.com> *Phone #* *(863) 944-9913* in Central Florida (Office hours: 12:00 Noon to 10:00 pm, New York time) On Mon, Jul 21, 2014 at 11:23 AM, Peter C. Thompson via EV < ev@lists.evdl.org> wrote: > Cable theft is a primary reason for wireless power transfer. Carrying a > cable with you just means you make it easier for someone to steal your > copper. Heck, even in my relatively safe suburb I have to worry about my > power cords disappearing! > > As for efficiency, I've seen plug-to-battery efficiency over 90%, but > nothing that has been officially published (yet). This works out better > than my 110v plug in! (Yes, if I were to put in a 220v system my > efficiency would go up.) > > Other factors to take into account: > * heavy rain > * snow > * high heat (e.g. Arizona in summer) > The user is not going to want to spend a lot of time outside the car with > the cable, much less touch the darn thing in summer. > > As for theft, I'm working hard on ensuring that the communication for the > financial side is better than the usual banking cruft (mutual > authentication, authenticated certificates, etc). TLS (you might know this > as SSL) is already mandated for the money side. Adding in WPA2 for the wifi > connection, and it becomes a LOT tougher for someone to spoof your car or > charger. > > Oh, here's another thing: there is a strong desire to have the EV handle > all types of charging - AC, DC and wireless. So if you want to use the > cable you can. If you have the wireless pad installed in your garage, > you're good to charge. Wireless is just another way to get power into the > car. > > Cheers! > > > On 7/21/14, 12:59 AM, Martin WINLOW via EV wrote: > >> It's not just convenience. There is the issue of theft/vandalism of/to >> charging cords and the (small) danger to passers by posed by them ie the >> trip hazard. They'll also wear out in time. The inductive system removes >> all these problems. MW >> >> >> On 21 Jul 2014, at 05:08, Peri Hartman via EV wrote: >> >> Me, too. However, consumers might not care (unfortunately). In other >>> words, you might pay 15% more to cover losses but compared to what? >>> Consumers will be happy to just park and have the charge happen >>> automatically. Unless energy costs are really high, they will get ignored. >>> >>> I'm with you, though. When a simple direct connect is nearly 100% >>> lossless, and so easy to plug in, why would I want to be so wasteful? >>> >>> Peri >>> >>> ------ Original Message ------ >>> From: "Al via EV" <ev@lists.evdl.org> >>> >>> >>> My problem with the whole wireless charging "dog and pony show" is the >>>> lost energy and the seemingly impossible efficiency claims. >>>> For instance, even if the high frequency transformer had NO air gap, >>>> there would still be a limit to its efficiency. >>>> How efficient is a 60hz transformer? Is a higher frequency transformer >>>> any more efficient? >>>> >>>> Al >>>> >>> _______________________________________________ >> 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) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140721/b9a2c2c0/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)
