[colug-432] RPi peripheral power consumption

Vince Herried Vince at PlanetVince.com
Sat May 18 13:44:00 EDT 2013

Scott, you know abt the PI model a, 1/2 the ram no ethernet, only 1 USB.
significantly less power drain.

On Sat, May 18, 2013 at 12:40 PM, Scott Merrill <skippy at skippy.net> wrote:

> I'm contemplating battery / solar power configurations, and want to
> minimize power consumption to prolong usage.
> No serious application: just tinkering. That's what Pis are for, right? ;)
> On May 18, 2013 11:42 AM, <jep200404 at columbus.rr.com> wrote:
>> On Sat, 18 May 2013 09:59:46 -0400, Scott Merrill <skippy at skippy.net>
>> wrote:
>> > Can someone tell me - in general - which would draw more power on a
>> > Raspberry Pi: a USB WiFi adapter or the onboard Ethernet port?
>> That depends on the USB Wifi adapter. I have an old one that I
>> think pulls around 450 mA. That's much for any USB thing,
>> and much more than the ethernet port uses.
>> However, for newer Wifi adapters, althought I just don't _know_
>> how much power they use, it's likely to be much less than my
>> old Wifi adapter.
>> Look at the output of lsusb to see the claimed max power for
>> each USB thing you try. IIRC, the Pi's ethernet port is a USB
>> device.
>> I guess in your case the power supply comparison would be
>> USB Wifi versus _incremental_ power used by ethernet port
>> when something is plugged into it and schlepping bits back
>> and forth.
>> > Or is the power draw differential so inconsequential as to not be worth
>> > worrying about?
>> That depends on what your power concerns are. If you are running
>> on batteries, it can be a big big concern. My Pi was flaky because
>> the wall wart I was using just was not powerful enough. After I
>> started using a more powerful wall wart, it became reliable.
>> In some other applications, heat can be a concern.
>> Besides curiosity, what power concerns do you have?
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