On 5 February 2013 11:22, Benjie Gillam <benjie@???> wrote:
> A loaded Raspberry Pi model B sucks down about 700-750mA, or more if
> you've hooked up particularly current-hungry USB devices to it. The USB
> specification states that USB devices should demand no more than 500mA, and
> many computer sockets/hubs will automatically disconnect devices that suck
> down more power than this - especially if the device doesn't do proper USB
> power negotiation. Some cheaper USB hubs (and some more expensive ones too)
> don't have per-socket regulation so you can suck the full 2A (or whatever
> they provide) out of just one, but I would not recommend it as a long term
> solution - the Pi is notoriously unstable when it's not connected to a
> decent power supply. Many computers provide more than 500mA per socket, but
> this cannot be relied upon.
>
> Some USB hubs deliberately have a high current port - these are normally
> highlighted for charging iPads and the like. Otherwise standard
> tablet/phone chargers that plug into the wall work quite well - I'd advise
> checking that these provide at least 800mA before using it. I'm using a
> 2.1A Nexus 7 charger for my RPi and it works wonderfully.
>
> Hope this helps,
>
> Benjie
>
Most of my efforts so far have involved the dedicated power supply and an
unpowered hub, but I have experimented with a single powered hub in various
configurations and have had no problems.
It goes without saying that I monitor the current being drawn most
carefully!
Chris.
>
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