Tesla Inductive Wireless Charging development has reached 25 kW charging speed

[Administrator]

The Cybertruck is equipped for inductive charging (see battery connector harness spotted in Service Manual), so this may a good preview of what charging speeds to expect from Tesla's future wireless charging system.

Tesla has just released this official inductive wireless charging demo video, showing wireless charging speed up to 25kw @ 35% SoC:


(Video plays at sister-site Cybercabrobotaxiforum)

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[tingmo13]

look at the data below-it's going to be very practical and game changer.

 

[Guylouis]

Absolutely. Can’t wait for rollout

 

[Gaximus]

I'm curious what the efficiency is on these. Inductive charging it's incredibly wasteful. I love it for my phone, and it uses magnets to ensure perfect alignment, and it's still not that efficient. If this charges at 25Kw, yet uses 35Kw of power to do so, it'll be a noticeable hit on the electric bill.

 

[swengl]

I'm curious what the efficiency is on these. Inductive charging it's incredibly wasteful. I love it for my phone, and it uses magnets to ensure perfect alignment, and it's still not that efficient. If this charges at 25Kw, yet uses 35Kw of power to do so, it'll be a noticeable hit on the electric bill.

This is exactly my concern, as well. For an unmanned Robocab, inductive charging makes perfect sense. For a consumer vehicle that needs to be charged maybe once or twice a week, I'll stick with plugging the HPWC in and getting the best cost efficiency. What I would like to see is a solar road where you drive over inductive chargers and it can boost your range without stopping, but that may still be a few years away from practical use.

 

[CyberGus]

I'm curious what the efficiency is on these. Inductive charging it's incredibly wasteful. I love it for my phone, and it uses magnets to ensure perfect alignment, and it's still not that efficient. If this charges at 25Kw, yet uses 35Kw of power to do so, it'll be a noticeable hit on the electric bill.

WiTricity claims 90%+ efficiency grid-to-battery for their wireless charging solution.

https://witricity.com/technology/why-magnetic-resonance

 

[rlhamil]

My thing is that if one cares about how oh-so-green EVs are (I don't hate that but it wasn't my reason for buying one), this isn't nearly efficient enough. I'd want >95% as efficient as plug-in for home use, and I don't see it as feasible at all for supercharger use, at least not in the near future. Wonder if there would be a warning for people with pacemakers not to be nearby when high power inductive charging was taking place. Not to mention if I had an old spinning rust hard drive, would that wipe it?

For superchargers, a minor mod to put a reflective rim on the charge port socket, so that a robot arm with camera could plug you in (and auto-park to get close enough, please; those charging cables are short enough to require getting uncomfortably close) would be enough to do a no manual intervention charging; and it would be only less efficient than manually plugging in insofar as the robot arm would use a W/h or two of power.

 

[PATEL]

WiTricity claims 90%+ efficiency grid-to-battery for their wireless charging solution.

https://witricity.com/technology/why-magnetic-resonance

Yup I read the same source... here's the main takeaway from this article:

https://witricity.com/media/blog/a-beginners-guide-to-wireless-charging-or-is-it-really-that-easy#:~:text=In one word, yes.,(and is most efficient).

In one word, yes. When it comes to wired vs. wireless EV charging efficiency, wireless charging is just as efficient as a Level 2 plug-in charger. In fact, it's likely you're operating in the 20-80% state of charge (SOC) range that your battery likes (and is most efficient).

With plug-in charging, it’s less likely that the 20-80% SOC range will be maintained since many drivers tend to forget to plug in. Some drivers even charge only once a week or drive all week and then plug in on the weekend. Not only is this less efficient, but it’s harder on the battery. With wireless charging, simply park and charge.

 

[CyberGus]

Yup I read the same source... here's the main takeaway from this article:

https://witricity.com/media/blog/a-beginners-guide-to-wireless-charging-or-is-it-really-that-easy#:~:text=In one word, yes.,(and is most efficient).

In one word, yes. When it comes to wired vs. wireless EV charging efficiency, wireless charging is just as efficient as a Level 2 plug-in charger. In fact, it's likely you're operating in the 20-80% state of charge (SOC) range that your battery likes (and is most efficient).

With plug-in charging, it’s less likely that the 20-80% SOC range will be maintained since many drivers tend to forget to plug in. Some drivers even charge only once a week or drive all week and then plug in on the weekend. Not only is this less efficient, but it’s harder on the battery. With wireless charging, simply park and charge.

It's true that L2 charging via cable is not 100% efficient, depending on the cable length. But I fail to see how efficiency is impacted by SoC.

 

[Woodrick]

look at the data below-it's going to be very practical and game changer.

What? You mean that 97.4% of the on-road passenger trips are less than 50 miles?

 

[Woodrick]

My thing is that if one cares about how oh-so-green EVs are (I don't hate that but it wasn't my reason for buying one), this isn't nearly efficient enough. I'd want >95% as efficient as plug-in for home use, and I don't see it as feasible at all for supercharger use, at least not in the near future. Wonder if there would be a warning for people with pacemakers not to be nearby when high power inductive charging was taking place. Not to mention if I had an old spinning rust hard drive, would that wipe it?

For superchargers, a minor mod to put a reflective rim on the charge port socket, so that a robot arm with camera could plug you in (and auto-park to get close enough, please; those charging cables are short enough to require getting uncomfortably close) would be enough to do a no manual intervention charging; and it would be only less efficient than manually plugging in insofar as the robot arm would use a W/h or two of power.

What was the efficiency of your last ICE vehicle?

 

[Crissa]

My thing is that if one cares about how oh-so-green EVs are (I don't hate that but it wasn't my reason for buying one), this isn't nearly efficient enough. I'd want >95% as efficient as...

Plug-in is already only 80-90% efficient. The on-board chargers aren't perfect, nor is the absorption of electrons in a battery.

The advantage, to this point, of plugging in is higher throughput as well as higher efficiency.

-Crissa

 

[CyberMoose]

I love the concept and it's great that Tesla is making this.

But I probably won't use it.

Though I think this will be great for things like RoboTaxi's when they need to charge.

The only way I would want this is if I lived in such a big house that my Truck could drop me off at the front door and then go park on the charger in the garage by itself.

But when I park, plugging in my Tesla is on my way inside. It takes like 5 extra seconds to plug it in.

It's definitely cool, but I don't see a whole lot of benefit for the average consumer.

Maybe if someone is super super forgetful. I know I've forgotten to plug in twice in about 2.5 years since I got my car. But if I did that weekly, I might be inclined to by this when it comes out.

 

[mongo]

It's true that L2 charging via cable is not 100% efficient, depending on the cable length. But I fail to see how efficiency is impacted by SoC.

Power into battery vs power to rest of systems while charging during taper.
Of course, there are also quadratic factors in charging efficency (I²R) so the optimal point is somewhere in the middle...

 

[Crissa]

But I fail to see how efficiency is impacted by SoC.

A battery isn't 100% efficient in absorbing electrons, and this efficiency varies by state of charge (which is why you have charging curves).

No electronic component is without losses, the best one we can make and use at room temperature is the transformer - but only for a set narrow range of alternating voltage. But even that has waste heat.

If they're talking state of charge, maybe they're offloading the charger into the induction pad, and putting only a rectifier and receiver unit in the vehicle?

-Crissa

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