0

I want to supply a rpi3 + a high-current (up to 450ma) usb device portably. Is it ok to get a battery pack with two usb outputs, attach the rpi3 to it, attach the data end of the y cable to the rpi3, and the power end to the battery pack?

Or, is there a better way to do this?

I ask because I've read that Y-cables are not really part of the USB standard.

As a side question, am I correct to assume that it would not be okay to power the rpi3 through a wall plug, and a usb device with a y-cable and battery pack, since the two devices would not share a common ground?

Improve this question
5
  • Your question is unclear - what does "power the rpi3 through a wall plug, and a usb device with a y-cable and battery pack" mean? Why not just power your USB device from the Pi3 USB ports?
    – Milliways
    Oct 5, 2016 at 7:46
  • Because the pi cannot supply that much current through a usb port, if i understand.
    – user3243135
    Oct 5, 2016 at 7:51
  • 2
    USB can supply 1.2A (given an adequate PSU) See Raspberry Pi Power Limitations
    – Milliways
    Oct 5, 2016 at 8:04
  • I.... I did not know that, thank you. I must've been reading the wrong things. That solves everything. If you make an answer, I'll mark it as chosen.
    – user3243135
    Oct 5, 2016 at 8:08
  • If by "batter pack" you mean a power bank sold for recharging mobile devices, be prepared for disappointment: raspberrypi.stackexchange.com/a/54242/5538
    – goldilocks ♦
    Oct 5, 2016 at 11:53

1 Answer 1

Reset to default
1

is there a better way to do this

Just power your USB device from the Pi3 USB ports which can supply 1.2A (given an adequate PSU) See Raspberry Pi Power Limitations

Improve this answer

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.