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I am using a RPI3 and have a GPS USB module and 3g USB dongle connected to the USB ports of the pi. I am using a 5 volts, 2.4 amps power supply. I was wondering if the RPI3 USB ports provide 1.2 Amps by default or only 600mA per port ? Because sometimes when initially powering up the system, wvdial fails (ppp dies, exit code:10), and then I reboot and it works. This keeps happening randomly.

If the rpi3 USB port provides only 600mA by default, is there a way to increase it to 1.2 amps in the software ?

Or do I have to just use a USB powered hub or just connect a y cable to 2 ports of the Pi and the 3g dongle ?

bobdxcool
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1 Answers1

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See Raspberry Pi Power Limitations for detail of the Pi3 power.

NOTE the Pi3 SHOULD be able to power, but my experience indicates this is not so. It is a combination of PSU which don't actually supply the correct voltage, thin USB power cable and internal voltage drops.

Your problem is probably NOT that the PSU cannot provide the current, but the voltage is too low. Many phone "chargers" do not supply 5V, and are permitted to drop to 3.6V which is adequate for phone charging.

Milliways
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