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
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