EVBob
Posts: 70
Joined: Tue Apr 18, 2017 6:06 am

Plugless wireless charging system?

Wed May 17, 2017 1:54 pm

Anyone on the waiting list/considering this?: https://www.pluglesspower.com/shop/bmw-i3-reservation-confirm/

jadnashuanh
Posts: 3542
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: Plugless wireless charging system?

Wed May 17, 2017 2:50 pm

I saw that, but my i3 is parked outside rather than in my garage, and I don't think the condo board would approve!

I think more and more cars will come with that built-in in the coming years...manually plugging things in is so old school! I don't know how good of a parking job you need to get things aligned, and I'm sure some people would have trouble with that. It can be fairly efficient, but it's not quite as good as a hardwired connection. Certainly more convenient. It would be neat if it was built into the roadways (one country is experimenting with that on a short stretch I read somewhere). Some people are just paranoid about magnetic fields, and those people would violently object.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV

PluglessSteve
Posts: 1
Joined: Thu Aug 04, 2016 1:21 pm

Re: Plugless wireless charging system?

Thu May 18, 2017 1:20 pm

Greetings - disclosure, I work for Plugless.

Alignment hasn't been reported as a major issue for our customers. in fact, most tell us that it's only when they focus on it that they have a greater chance of missing. Plugless allows 4 inches and even up to six inches of misalignment in any direction from center.

There are dynamic wireless charging programs all over the planet, including a test bed at ITIC (part of Clemson U.) - we are the Evatran in this announcement: http://www.itic-sc.com/itic-automotive- ... a-service/

Charge onward,

Steve C.

MikeS
Posts: 703
Joined: Thu Jan 16, 2014 8:29 am
Location: Brighton UK

Re: Plugless wireless charging system?

Tue Aug 01, 2017 2:02 am

However, wireless charging is hugely inefficient and therefore costly!
BMW 3 Series 2005 - Aug 2014
BMW Z4 35i 2009 - Mar 2014
BMW X1 Mar 14
BMW i3 Sep 14

jadnashuanh
Posts: 3542
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: Plugless wireless charging system?

Tue Aug 01, 2017 6:54 am

MikeS wrote:However, wireless charging is hugely inefficient and therefore costly!

It doesn't have to be hugely inefficient, but that depends on the design and actual alignment accuracy plus the distance between the two components. It will never be as efficient as a direct, hard-wired connection, though, but certainly more convenient. It's one more thing to add weight to the vehicle, and, if you don't want to limit road clearance or worsen drag, will always be somewhat less efficient.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV

I33t
Posts: 866
Joined: Fri Dec 13, 2013 3:01 pm
Location: Australia

Re: Plugless wireless charging system?

Tue Aug 01, 2017 4:30 pm

MikeS wrote:However, wireless charging is hugely inefficient and therefore costly!


That is my first question for plugless charging! Could be very inefficient and waste of power!

Looked at all the 'technical specs' on their website, and no efficiency details.
2014 BMW i3 BEV deposit placed 19th Dec 2013
Delivered in Melbourne 4/12/2014. Arrived locally 11/12/14, with 24km on the clock.

brastic
Posts: 32
Joined: Thu Apr 27, 2017 11:29 am
Location: San Jose, CA

Re: Plugless wireless charging system?

Wed Aug 02, 2017 11:55 am

I33t wrote:
MikeS wrote:However, wireless charging is hugely inefficient and therefore costly!


That is my first question for plugless charging! Could be very inefficient and waste of power!

Looked at all the 'technical specs' on their website, and no efficiency details.


I also went to the specs of the web page looking for the efficiency. My guess is that it will be around 50% efficient just like wireless cell phone charging. For my cell phones, I really do not care that I waste 50% of the power to wireless charge. For a car, that would really add up. We will have to wait till real world products are out before we can get a good efficiency rating. I am doubtful, but hoping for the best.

theothertom
Posts: 222
Joined: Mon Mar 20, 2017 6:08 am
Location: South Carolina

Re: Plugless wireless charging system?

Wed Aug 02, 2017 1:17 pm

The linked article below gives a little bit of info. You may be able to get an estimate of charging efficiency for the article, especially if you know the battery size.

http://www.bmwblog.com/2017/04/27/bmw-w ... -charging/

Also, from Wikipedia:
For example, the Magne Charge vehicle recharger system employs high-frequency induction to deliver high power at an efficiency of 86% (6.6 kW power delivery from a 7.68 kW power draw).
https://en.wikipedia.org/wiki/Inductive_charging

And
The results showed a power transfer rate of 6.9 kilowatts with efficiency greater than 85%.
https://faculty.washington.edu/dwhm/201 ... -the-cost/

And
The Department of Energy’s Oak Ridge National Laboratory has made a recent breakthrough on that front that shows promise, with a proof-of-concept 20kW charger working at 90 percent efficiency
https://gizmodo.com/wireless-charging-f ... 1769032403

Google efficiency of inductive charging for automobiles

jadnashuanh
Posts: 3542
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: Plugless wireless charging system?

Fri Aug 04, 2017 7:35 pm

Efficiency can exceed 90%, but is dependent on matching the coil sizes and minimizing their separation. https://www.wirelesspowerconsortium.com ... iency.html

Biggest hassle is you need ground clearance on a car, but if you could lower the coil while stopped and charging, you could increase the efficiency radically.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV

brorob
Gold Member
Posts: 97
Joined: Sat Oct 31, 2015 5:53 am

Re: Plugless wireless charging system?

Sat Aug 05, 2017 8:04 am

So what happens if my cat walks on the charging pad while the car is charging? :D :shock:
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