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Siemens has hands free contactless inductive charging perfected

Google Siemens electromobility. Click on the banner with that name. On the website, click at the right on the video labeled "Inductive charging". Great video.

WHY has Tesla not picked up on this? No need to plug the cars in. Just drive over a charger and press a button on dash. Car starts charging through induction from coil under the pavement.

I'm retired from GM and I've urged GM to look at this for the Chevy Volt and upcoming- and spectacular- Cadillac ELR. See it. Chevy dealer here had not heard of it!. Said you'd want to keep the ability to plug the car in even if car could do wireless charging from below.

Siemens says the charging can be faster from under the car. There is even a small company now in Virginia selling these systems for the Leaf and Volt. See www.pluglesspower.com. Evatran is the company. See presentations on UTube by Sales and Marketing Director of Evatran Rebecca Hough. They say Sears is installing the unit on your garage wall and the unit on the garage floor. You have to have a Chevy dealer install the receiving unit in your car.

Evatran says a "growing number of Chevy dealers are handling these". Wonder what GM thinks of that.

I told GM that I envision a tamper-resistant meter in the car that records where (GPS) and when (clock) you take on electricity. It transmits this info. wirelessly continuously to the power company. If the car takes on electricity at a shopping mall, office park, university, med. center, factory, etc, that entity's electric bill could be credited. The car would identify itself to the utility. The owner's electric bill would show any electricity he took on at home and any he took on elsewhere.

BTW team at Stanford has proven on computers that cars can charge by induction AS THEY TRAVEL ON HIGHWAY. Google wireless energy transfer can revolutionize highway travel Stanford. Click at right on the page that comes up on GCEP forum 2011. There see the video by Prof. Fan on light scattering and then wireless energy transfer. Ph.D in Physics from MIT.

L. Harding
Fresno

loran.harding@stanfordalumni.org

One reason might be the power losses.

When the EPA rates the MPGe they start from the A/C power source(as I understand it). The losses in the inductive charging would probably make the 89 MPGe of the S more like 71 MPGe. I don't care what facts are stated, there will be additional losses.

The system has to be standardized otherwise you will be plugging in everywhere except in your garage. The first trick in BEVs is going to be getting all the owners to get in the habit of keeping the car charged whenever possible. If I buy an inductive charging mat with a Leaf, I guarantee it will not be compatible with the one for my Tesla.

I would also not want to be forced to buy a charging mat when I can remember to plug the car in..... I'm cheap! lol I imagine most people are purchasing the minimum for their charging needs so I don't think that many inductive mats would sell.

All that typing and I will concede that I see no problem with making it an option.

I think that this works by using electricity to create an alternating magnetic field, as the current flows through the mat.

Is there any reason that that power has to head for ground? Can it be heading to my TV, Computer, Lights, etc? e.g. can the pad be between the meter and the rest of my home, thus allowing normal power usage to charge the car, and if that usage is too low then direct some watts to ground to keep the field up to snuff?

... or am I nuts? And if so why?

Here's the rub:

"Wireless charging is based on inductive power transfer, which has been in use for over a century. It simply and safely uses electromagnetic fields to transfer electricity between two coils – one installed in your car and the other in your garage. Think of your electric toothbrush."

So you'd need something installed on the car to convert the electricity over. They say the wall units will be competively priced with similar wall units but they don't mention the cost for the car unit.

Here's more from their Q&A section --

"Is it just as fast as a cord?
Thanks to our innovations in proximity charging technology, Plugless Power solutions deliver a high-power charge that recharges your EV as quickly as it would charge with a cord.

How does the cost compare to a plug-in solution?
Experts forecast that corded charging units will cost between $1,000 and $3,000. Plugless Power wireless EV charging solutions will be priced competitively in this range."

Just as fast as what cord? I'd like to see them match the $1250 Tesla wall device that delivers up to 100A.

Given the structure of the Model S, this might be a very tough thing to retro-fit. It would need to be built into the car at the factory, I think.

Keep in mind the Tesla solution cheats a bit: the costs are $1250 for the wall unit plus the included single charger plus the additional charger for another $1500. If compared more apples-to-apples then you're looking at $2750 for up to 40A of charging with the base car.


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