[biker1]

I saw efficiency numbers of around 80%. Regardless, I don't see a demand for residential golf carts as plugging in every night is not an issue. For autos, it looks like Tesla is going that route for their robotaxi as they want hands-off servicing.

Originally Posted by Normal

Yes, but delivery costs almost double from the price of 1st stage primary winding costs.

In other words, a step down transformer uses 220 volts and enough copper windings in its second stage to get to (your cars magnetic inducer) for charging at 110 volts. The gap and using enough excessive voltage to cause induction across the air is inefficient and more expensive to use. Induction is fine when looking at micro batteries and cell phones or hearing aids, but voltage to a car is an entirely different animal.

You or I could make a car that runs off of water too. The issue is the energy resources required to split the oxygen from the hydrogen atoms.

[biker1]

There are a couple of issues. First of all, charging is slow - about 5 miles of range per hour. Secondly, most carts will go 40+ miles on a charge. I doubt few people are going that far in a day so as long as you charge overnight to 100% then you should be good for the day. I just don't see a demand.

Originally Posted by sonnyford

Just wondering if anyone has heard if The Villages or some entrepreneur has thought of adding charging stations at recreation centers or town squares? At a cost of course. 🤷

[Altavia]

Originally Posted by Normal

Imagine the voltage variations and changes from various gaps throughout induction. On top of that, it would cost a lot more to charge a cart because of voltage inefficiency and power loss at the induction phase. It ain’t happening.

WiTricity designed to the SAE J2954 standard and uses 85KHz magnetic resonance to wirelessly transfer power between a charging pad on the ground and a receiver mounted under an electric vehicle, allowing drivers to simply park and charge without plugging in.

Unlike conventional inductive chargers, it can efficiently transfer high power across a 6–12 inch air gap with typical efficiencies of about 90%, only slightly lower than a wired charger.

Compared to a typical Level 2 home charger operates in the range of about 83-94% efficiency grid-to-battery depending on which one you buy.

Comparing efficiency: Wireless EV charging vs. plug-in EV charging

https://www.witricity.com/pdfs/WiTri...r-Transfer.pdf

WiTricity’s wireless charging can be designed to work in both directions, allowing an EV to charge from the grid or return power to it (V2G) using the same magnetic resonance technology.

It is slightly less efficient than a wired connection but offers the convenience of fully automatic charging and grid support without plugging in. Bidirectional wireless charging has been demonstrated but is not yet available commercially.

It in use in Korea to charge EV's.

https://youtu.be/MpfzNQ97jH8?is=JLbj2Rg4di3DqbfZ

[Altavia]

Originally Posted by biker1

It looks like they can deliver about 1 kW. Pretty much what my charger draws.

Correct, for example, an ELiTE lithium battery is roughly 4.3 kWh charge time from empty would be:

* 600 W system: about 7–8 hours from empty.

* 900 W system: about 4–5 hours from empty.

[Altavia]

Originally Posted by sonnyford

Just wondering if anyone has heard if The Villages or some entrepreneur has thought of adding charging stations at recreation centers or town squares? At a cost of course. ������

Unlikely, most carts will go for 4+ hours of driving, just make sure they are charged before leaving.

Golf courses and maybe a Villages Lifestyle homes (or rentals?) where visitors frequently forget to plug in the cart are good first candidates.

[mestabr]

Not necessarily terrible efficiency. WiTricity uses resonant inductive wireless charging that under the right circumstances can achieve efficient energy transfer (never as good as cords) so that there is not too much loss. I worked with WiTricity for years. It's a fascinating technology first described by Nicola Tesla as I recall. Resonance uses specific tuning between transmitter and receiver to achieve high efficiency energy transfer, kind of like the opera singer shattering a glass with a specific tone / frequency.