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Published on May 21, 2013
Here I measure how much energy (current drawn in milli amps or mA) the Raspberry Pi uses either: * by itself * with various wifi adapters * with ethernet In either case, the Raspberry Pi runs in headless mode (no monitor, no keyboard, no mouse). Just the bare RPi and a network adapter.
With nothing plugged in: While booting up 360mA. Then lowers to 320mA
Then with Ethernet plugged in: 370-400mA peaking at 900mA
Then shutdown, when off: 111mA, cpu is always a little warm
Boot up with Asus n-13 wifi: up to 530mA then settles down to 490mA, with file transfer: just under 600mA
Shutdown, power goes back down to 110mA
Alfa long range wifi adapter, AWUS036NEH, fails to boot up. uses too much power
DLink BWA140NA B2: uses 600mA, not recommended without powered hub
Tenda W311U: uses too much power and disconnects too often, not recommended
Tenda W322U: also not recommended
Plug in EDImax EW-7811Un: 360-400mA hardly any power used, recommended file transfer: up to 460mA, peaking at 500mA