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USB Port Output

MrJones390

Space Boat
Jun 26, 2015
246
47
Los Angeles
Here you go: Tesla Model S Fast Charging USB Port Hack - TESLARATI.com

Summary

I confirmed that both ports on my Model S charge at a rate of 1 amp, and not the 2.1/1 amp that some forum members (myself included) have previously reported. Actual measurements indicate that the PortaPow device is useless in the Model S. Skip it.
My recommendation is to get a good USB car charger that’s capable of charging at the maximum 2.1A rate. You can pick up a decent charger for under $20 that will actually do the job.
 

TheAccuser

Member
Nov 20, 2014
138
4
Cleveland, Ohio, United States
Here you go: Tesla Model S Fast Charging USB Port Hack - TESLARATI.com

Summary

I confirmed that both ports on my Model S charge at a rate of 1 amp, and not the 2.1/1 amp that some forum members (myself included) have previously reported. Actual measurements indicate that the PortaPow device is useless in the Model S. Skip it.
My recommendation is to get a good USB car charger that’s capable of charging at the maximum 2.1A rate. You can pick up a decent charger for under $20 that will actually do the job.

Awesome info! Thanks for the link. I ordered this yesterday: Amazon.com: Car Charger, [Apple MFI Certified] 3.1A Lightning iPhone Car Charger with 3ft Lightning Cable for iPhone 6s, 6 / 6 Plus / 5s / 5, iPad Air 2 and more by eBuddies (Black): Cell Phones Accessories
 

JeffVanEpps

Member
Apr 1, 2015
73
13
Any info on charging rate from the phone mount USB port in the center console? My phone thinks it is charging but it seems to me like the rate might be 0 or even negative.
 

Jedi2155

Model 3 has Arrived.
Jul 6, 2018
1,677
1,401
Upland, CA
I know this is an ancient post, but wanted to report some findings I'm doing on my current loaner while my Model 3 is in the shop:

I had a rather janky setup but had the following equipment:
  • Drok USB Power Meter
  • Note 8
  • iPhone 7
  • Anker 10000 mah powerbank
  • A variety of USB cables and adaptor
  • 2018 Model S 75D
Plan on getting a proper USB3.0 extension cable so I can test the front USB ports properly. My existing set of adaptors/dongles causes too much voltage drop due to the increased resistance impacting the tests. I was unable to connect the evice directly to the front USB ports as well due to the shape of the tester. What I did find was the following:

  • Front USB seems to have a greater voltage drop than the rear USB
  • Rear USB can charge up to 1.5A on my powerbank, but all ports seem to limit to 1A on my both my phones
Front USB -
Vopen ~ 5.09
Vload ~ 4.5 to 4.75v (loose connection and or extension cable so...take these values with a grian of salt)
Max Current ~1 A with phone charging

Rear USB
Vopen ~5V
Vload ~4.9v
Max Current ~1 A with phone charging, ~1.5A charging powerbank directly. 1A with USB cord


Check out this dongle monstrosity :D in my attempt to get an working extension cord. Current dropped to a mere 0.3A at 4.5v due to the poor connection and reduced resistance.
USB Y-Splitter -> Mini to Micro USB dongle -> Micro to USB A dongle -> USB power meter -> USB A to USB C -> Note 8
20181203_004307.jpg
I had some other various USB extension cords but all them had some type of obstruction that prevented a proper connection.
 

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