I decided to test out my front 2 ports since I ordered the jeda pad and wanted to see if I needed to route power from the 12V plug. I have a power bank that can pull 5V/3A to really get the upper limits of what the USB ports will put out. To my surprise, I was able to get over 2 amps. The peak was about 2.5 amps with the mean around 2.1 amps. I'm on FW 2018.14.13.
-
Want to remove ads? Register an account and login to see fewer ads, and become a Supporting Member to remove almost all ads.
Front USB Ports >2 Amps
- Thread starter dc81
- Start date
We should ask if this Jeda @wirelesspad whether that eliminates the need for the fast charging module (at least for iphone users)
Last edited:
barjohn
Member
Initial tests shown using each port are with a purely resistive load. Then increasing the load to up the current and watching the voltage drop followed by being plugged into an iPhone X.
Kbra
Member
the problem with this video is that it was done in Jan 2018 before the latest firmware. I read somewhere that as part of the recent update, the front usb amps got pushed to 2+ amps--so wanting anybody else with 2018.14.13 to confirm either 1 amps or 2 amps. Both posters above got different answers.
Kbra
Member
Kbra
Member
This one looks pretty legit. Would be good to use similar testers and maybe try USB C and see if its any different.
USB C Power Meter Testers, Eversame 2 in 1 Type C USB Tester LCD Digital Multimeter, USB C Voltage Current Meter Voltmeter Amp Volt Ammeter Detector Power Bank Charger Indicator DC3.6-30V/0-5.1A
barjohn
Member
Well, today I learned that my prior readings were incorrect due to the fact that there is an apparent cable sensitivity in that some cables are apparently in capable of providing full power and are dropping the power across them. In my prior photos I used a short blue USB male to female cable to extend the meter out of the cubby to make it easier to see. Today I plugged the meter directly into the ports with both an iPad mini and resistive load. I was able to get 2A easily out of all 4 ports with the resistive load and over 1.3A with the iPad that was at 86% charged.
See my crappy unedited videos:
See my crappy unedited videos:
So just to be clear, you're able to achieve 2amps in the front usb ports, which would equate to getting 10 watts (5V x 2.0amps) correct? If that is the case, that would suggest that we would be able to do fast charging for the iPhone which maxes out at 7.5w. Not enough for samsung fast charge which requires 15w, but enough for iPhones--this would mean we would not need the fast charging module.
barjohn
Member
barjohn
Member
If you used a referral code you got free phone Supercharging at 2amps.
If not, then you are stuck with slow phone charging...
If not, then you are stuck with slow phone charging...
Dan203
Active Member
Does anyone know if this is per port? Or if it's 2a total for both ports? I was thinking about swapping my pi zero for a pi 4, but the pi 4 specs say that it can draw up to 3a so I'm wondering if it's possible to combine power from the two ports to get enough amps or if I'd have to run something from the 12v outlet.
