I was wondering if it was possible to power a raspberry pi 3 b+ and a dozen usb 3.0 sticks, or if not, what would be the best recommended way to go about this, ideally i'm looking for an off the shelf solution as i don't want to cause a fire with making a diy solution.

  • You may be able to power them, but you may run into problems accessing them all. AFAIK there's a limit to the number of USB memory devices that can be accessed at the same time (somewhere around 6 to 8, IIRC) – Dirk Dec 26 '18 at 9:43
  • raspberrypi.stackexchange.com/help/on-topic , Asking for specific purchasing recommendations: – MatsK Feb 19 '19 at 13:17

This question is partly speculative, too vague and unanswerable.

The one part which can be answered you CAN NOT power a Pi from a hub. There are some non-compliant hubs which will provide more than 500mA but being non-compliant they are usually ill defined and thus unknown.

The Pi requires a minimum of 1A - preferably 2.5A from a proper power supply.

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  • You can power any RPi1, zero or original B+ or A+ from a 500mA USB as long as the RPi doesn't have any USB devices plugged in. Any RPi from the 2B upwards won't run reliably from 500mA. – Dougie Dec 26 '18 at 9:58
  • @Dougie this may be true - if doubtful, but is totally irrelevant as the OP has a pi 3 b+. Not to mention a compliant hub will only supply 150mA unless a higher current is negotiated - which the Pi can't do because the power port has no data channel. – Milliways Dec 26 '18 at 10:04
  • i guess my best option is to get another two raspberry pi's so i can power all dozen usb sticks? – Have a Laugh Dec 26 '18 at 11:45
  • @HaveaLaugh, no your best option is not to get more Raspberries (unless there is a need for that not yet covered in your question) but get two powered seven/eight-port hubs, connect both directly to the Pi (do not chain them) (compare to 12 port hubs if you like, I found those to be prohibitively expensive). Chances are that you can power both hubs from the same supply depending on the flash drives connected, but that would require to make your own cable (DIY involved). – Ghanima Dec 26 '18 at 13:27

Here is one possibility how to power RPi from USB hub.


Also check this video: https://www.youtube.com/watch?v=9D8N3BwYL4w

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