How much power does the Mini2440 use?
With 5V input, the Mini2440 + 3.5″ LCD uses 600mA peak (3 Watts), 440mA when Linux is idling and the backlight on, 290 mA when Linux is idling and the backlight off. When Linux has shut down, the system is waiting for a reset at 250 mA (1.25 Watts). A Mini440 with no display runs between 200 mA and 300 mA. Adding SD cards has a small effect. USB devices like wifi can increase the load quit a bit.