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Charging power limit

rpvrealtor

Lurker
My wife and I each have Note 5s and a Tesla Model 3 which puts out 7.5 watts thru each of 2 front USB ports. The car also has two rear USB ports which I believe put out the same power. If I connect all 4 USB ports to a cordless phone charger I plan to buy then theoretically it would deliver 15 W per Note 5. Mine question is how much power can a note 5 take for charging?
 
I believe 15 watts is what it takes normally which is considered fast charging.

The stock fast charger for the phone delivers 1.67A at 9V which is 15W. Whether the phone can take more than that, I don't know, but it is capable of 15W.
 
The rating of a charger or charging port indicates the maximum output it can provide. A device connected to it will only draw as much power as it needs so you don't have to worry about the port delivering excess power. On the contrary, it's better to have a charger with an output rating at least equal to if not higher than the requirement of the device you're plugging into it to ensure that it will charge properly.
I don't think you can combine those ports together (if that's what you're suggesting) and I wouldn't do that, just connect each device to a single port.
Fast charging as stated is 9V instead of the usual 5V for standard USB charging, I doubt that any built-in car ports are capable of this and will most probably deliver only 5V.
Also note that all the power ports in a vehicle are most likely on the same circuit (this can be checked by looking at the fuse box diagrams in the owners manual), so the total draw of all devices plugged into the ports at any one time should not exceed the current rating of that circuit.
 
My wife and I each have Note 5s and a Tesla Model 3 which puts out 7.5 watts thru each of 2 front USB ports. The car also has two rear USB ports which I believe put out the same power. If I connect all 4 USB ports to a cordless phone charger I plan to buy then theoretically it would deliver 15 W per Note 5. Mine question is how much power can a note 5 take for charging?
You cannot just 'combine' the power output of multiple USB ports the way you're implying, and a wireless charger won't be able to supply the amount of power to meet your expectations anyway. If your intentions are to manually rewire individual USB adapters to provide a single output, note you'll probably being shorting out some circuitry in your Tesla (with the hope that the USB bus inside your car is modular and will just pop a circuit breaker/fuse).
 
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