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A comment on Charging cars at home at night is not the way to go: study. Parent comment

Re:Charging cars at home at night is not the way to go: study by Kirby64 on Friday September 23, 2022 @12:29PM (#32954052)
Remember, when you charge your cell phone, you charge at ~15W (or less), so 80% efficiency is something like 3W of power loss. You can dissipate that pretty easily.

For a car charging, you're charging closer to 7-11kW. Dissipating 2.2kW (20% of 11kW) as heat is basically impossible. The inductive charging they're using for cars (which, are basically mostly prototypes at this point) are different and use much more closely coupled coils... so they can get better efficiency. Whether it works in practice, I don't know, but that's what companies are claiming who come out with these solutions.

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Re:Charging cars at home at night is not the way to go: study by Scoundreller on Friday September 23, 2022 @04:25PM (#32956632)
I worry that my phone’s battery gets hotter while charging so it’s getting double damage when it comes to lifespan. Maybe we should add a fan to inductive phone chargers…

(Doesn’t help that 99% of people run a case on their phones, and I doubt the manufacturer’s inductive charging efficiency tests account for that)

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