Connected to a single 5v 2a usb "charger" was the following equipment....
USB power "meter"
22guage good quality USB cable <--- possibly the most critical component!
Official 7" LCD
wireless keyboad/mouse dongle
here are some peak values
Bare in mind just how much difference a decent cable makes - with the "normal" type of USB cable I was getting the colourful square of under power on idle....
Code: Select all
Amps activity 0.65 Idle either console or X 0.75 3d Java application (as seen in attachment) 0.96 compiling an application with make -j4 0.98 compiling with -j4 AND running 3d java application
USB power adaptors frequently push out more than exactly 5v probably just to counter the state of "normal" USB cables
None of this should be taken as accurate and is only as a real world indication - posted in the hope people might find it useful and or interesting