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Time to change a basic Supercharging design?
- Thread starter Chris Barnes
- Start date
You are incorrect. There is no country where DC charging cables have to be supplied by the consumer - the driver.
Assuming you're referring to the induction coils in the ground under the car, that will give 50% transfer efficiency at best. That's fine for charging a phone where you may waste 20 watts of power but when we're talking KW, the cost starts adding up quickly.
That's also a very strong magnetic field. Don't count on your credit card swipes working after standing near one in operation.
Nope, the systems are pretty much the same efficiency as wired charging.
Tam
Well-Known Member
You are still holding onto the good old days numbers.
"Wireless charging for EVs is considered as efficient and fast as charging with a plug. For example, most EV plugs have 80-95 percent efficiency ratings. According to WiTricity, a leading provider, their wireless EV chargers achieve 90-93 percent efficiency."
RTPEV
Active Member
No mainstream models can from the factory today, but there are aftermarket add-on solutions available for several. And Tesla had recently acquired a wireless charging company (and then for some reason sold it ???) Tesla sells its recently acquired wireless charging company
Maybe they harvested it for IP / people?
Wireless charging is an excellent solution for L2 public or streetside charging applications where charging pedestals would be problematic to install, or where vandalism or other restrictions might be an issue. And while you can get reasonably high power transfer wirelessly, I don't really see it getting into the DC fast charging realm, and certainly not to the 250-350kW range that Supercharger and other ultra-fast DC fastchargers occupy, serving the road trip need. That said, if there were more wireless infrastructure in place (in condo parking lots for example), perhaps there would be less need for Superchargers to serve local users, shifting to focus to road trip use cases where the chargers would be located in more secure areas.
If it was the former, the thief would have taken the cables. If it was the latter, the vandal would have left the cables on-site.
I don't think any currently come from the factory with it. WiTricity is trying to get OEMs to integrate their solution. (Which they demo on Ford Mach-es.)
From the WiTricity FAQ:
I'm pretty sure there are multiple companies with wireless charging solutions that go into the 200+ kW range.
Here is another company that claims that they have up to 450kW solutions:
Induct EV
High-powered wireless made easy. Helping private and public operators of transit and commercial vehicles power their fleets of the future by providing proven, reliable and efficient wireless charging and seamless solutions and support.
momentumdynamics.com
Bjorn even has a video of testing their solution in a public install.
bradtem
Robocar consultant
While the OP has confused level 2 charging cables with DC Fast, it's not out of the question to make a cable which did liquid cooling and plugged in. It would not be easy, you would need to get a good and verified coupling on the cooling fluid link and it might not be worth it. And overall, you would do this only if you absolutely had to, because it's hard and it's expensive. There are many more cars than charging stations, so making every car carry its own large fat expensive cable is not at all economical. And an inferior experience.
Retractable cables make more sense. Though even with those, people might take an axe to the station to get it out which makes it even worse. They might have to retract into an axe-proof box. No, people need not be afraid of electrocution. EV charging systems never send power until a communications link has been established with the vehicle. I doubt Tesla SC send any power to the red stall before a car is solidly plugged in, not just to the cable.
One approach used it retractable cables that descend from poles in the sky. Then the thief has to climb the pole, and break open the secured box on top of the pole. Not worth it, one hopes.
Retractable cables make more sense. Though even with those, people might take an axe to the station to get it out which makes it even worse. They might have to retract into an axe-proof box. No, people need not be afraid of electrocution. EV charging systems never send power until a communications link has been established with the vehicle. I doubt Tesla SC send any power to the red stall before a car is solidly plugged in, not just to the cable.
One approach used it retractable cables that descend from poles in the sky. Then the thief has to climb the pole, and break open the secured box on top of the pole. Not worth it, one hopes.
The City of Seattle has/had a program to install those on neighborhood power poles when requested, I thought they looked like a great plan but I have yet to see one when driving in the city.
Attachments
And from the example shared earlier, it appears that the Tesla safety protection systems are good enough that even cutting a cable while it is powered isn't fatal. (It did make for a nice shower of sparks though.) Or they were using well insulated cutters.
ucmndd
Well-Known Member
Yup, nobody would even think about popping charging pads off the ground to get to the big copper coils inside.
Just need to install more security cameras and be tougher on crimes. Carry your own cable just sounds stupid to me. Why should we carry the extra cost and inconvenience for the few petty thieves out there.
enjoy the koolaid.
Business case: get a bunch of suckers to invest a lot of $$$ in supporting your snake oil. Hope they'll protect you so they won't look bad for making the bad investment.
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