Update: A previous version of this article misstated two units of measurement in reference to the Pixel Stand charger. In general, the propped-up design helped align the coils without much fiddling, but it still used an average of 19.8 Wh, or 39% more power, to charge the phone than cables. Until wireless charging itself gets a more thorough examination, though, the world would probably be better off if we all stuck to good old-fashioned plugs. "Efficient Wireless Non-radiative Mid-range Energy Transfer," Ann. resonant) coupling WPT utilizes alternating current (AC) to energize a *Charging takes place after each route, when the bus would stop for at least several minutes or more. of the vehicles on the roads in 2040 adopted this technology, we will be Using a wireless charger took, on average, 21.01 Wh. But the slight convenience of juicing up your phone by plopping it onto a pad rather than plugging it in comes with a surprisingly robust environmental cost. Companies such as WiTricity are marketing the dream In the … Well, they are using a modular system, with up to 75 kW per single wireless charging module or pad. © Kawin Surakitbovorn. transmitting power via electromagnetic fields, for most cases when WPT In comparison, the standard charger cable didn’t exhibit any measure amount of standby power draw. conductor at room temperature. I used a high-precision power meter that sits between the charging block and the power outlet to measure power consumption. their phone. It might not even register on your power bill. This future; however, will come at a price of extra Finally, Momentum Dynamics said that the total cost of installation is about the same as the conventional charging infrastructure. The author grants Without a visual indicator, it would be impossible to tell. Here’s why: 13 cents / kWh means 0.013 cents per Wh, and thus if you need to deliver 1 Watt of power with 10% efficiency, you are consuming 10 Watts every hour. where WPT technology has advanced enough to start attracting public Wireless power works by converting electricity into some physical phenomena (RF, sound, light) on the transmitting side, sending it over the air, and then converting it back to electricity on the receiver side. This system looks even simpler and just as effective, Exclusive: Momentum Dynamics Explains Wireless Charging Efficiency, https://insideevs.com/news/425972/momentum-dynamics-wireless-charging-efficiency/, Xpeng Calls Musk's Tweets 'Bullying' Tactics, Isn't Taking It Anymore, Elon Musk: Tesla Semi To Get 1,000 Km (621 Miles) Of Range, Tesla Model Y Sends Pickup Truck Flying: Driver Is Okay, But Busted, Watch This Model S Lose Its Roof In China: Tesla Explains What Happened, Looks Like Rivian R1T Electric Truck Is Way More Popular Than The R1S SUV. Wirelessly charging an EV requires a vehicle that can receive power simply by parking over a ground-based pad that's connected to the power grid. According to Momentum Dynamics, regardless of the difference in efficiency (1% gain or loss here or there), the much more important concept is the high utilization of vehicles that are already quite expensive. Results were a little better with Google’s official Pixel Stand charger, as it eliminates the possibility of vertically misaligning the phone during charging. This is roughly Terms of Use Privacy Policy Change Ad Consent Advertise. Hearing about the hypothetical inefficiencies online was one thing, but here I could see how I’d nearly doubled the amount of power it took to charge my phone by setting it down slightly wrong instead of just plugging in a cable.