It’s important to understand that the claims made by the Electreon company in text and the slick, professionally produced video are commercials meant to sell their product to non-technical people. In other words, people who dole out tax money to companies promising unattainable results.
They want you to believe that their system will replace plug-in charging. It won’t.
At best, it adds incremental charging while in operation which will only delay the inevitable plug-in charge sessions, or a facility where a vehicle could be parked on top of a charging coil when not in use.
Their promotional video claims to show a vehicle circling an oval test track for 100 hours for a total of about 1200 miles. That comes out to 12 mph. They show a transfer of 241 kWh in that time period, but they don’t mention how much of that energy actually ends up in the battery. There is no question that the efficiency of a wireless charging process is lower than with a direct connection.
"There is no question that the efficiency of a wireless charging process is lower than with a direct connection."
Plug-in charging is not 100% efficient. Energy loss, primarily in the form of heat, occurs every step of the way from grid to battery. What’s more, regardless of the brand, a plug-in EV charger is made of many components, any one of which may be more or less efficient than similar components in another charger. So, the “efficiency” of the transfer of energy from the grid all the way to battery encompasses a range; a typical Level 2 home charger operates in the range of about 83-94% efficiency grid-to-battery depending on which one you buy. https://witricity.com/media/blog/what-is-efficiency-how-do-you-measure-it-and-why-should-you-care
