Hello,
Can I power my nano via usb port with 12watt and output of 5.2 V and 2.4A power suppy?
Yes BUT...
Question: Was the 5.2 measured? If so was it with or without a load.
BTW the Nano requires maybe 200 ma at the most. That means the power supply should be able to supply approx 2 X 200ma = 400ma MINIMUM for the powersupply. There is not MAXIMUM for the power. If you adapter was able to supply 100amps it would not matter, as long as the power could supply the 400 ma.
In the above I was very generous with the stated currents. In addition the 2x factor is a good design for lower power devices. If the adapter was only able to supply 200ma and the circuit draws 200 ma, it would be a marginal design. i.e. no headroom for safety.
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I don't see why not, i power them from PC USB ports, 2A USB charger, 2A Power Brick and via a hacked USB cable and a buck convertor from a 12v lipo down to 5v
Only thing i have found is the three nano I have, are more sensitive to noise on the supply line the higher the voltage is.
I have been testing with the 8x8 LED matrix displays and found they work ok at about 3.8v but as the voltage gets higher you have to put a big cap (2200uf) across gnd and 5v pins else the noise causes to program to crash and/or the cpu to reboot.. Very Unstable 
Hope that helps imk
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Why don't you use a 5volt cellphone charger with USB socket, and plug the Nano USB lead in there.
You can use a 5volt supply with more current (2.4A), but that extra current is useless because you can't draw more than about 400mA through/from the Nano anyway.
The classic Nano takes about 30mA for itself.
Leo..
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At least, that (500 mA total) is the nominal rating of the diode between the USB connector and the "5V" terminal.
are you soldering usb adaptor yourself? if charger has usb plug at the end of the cord already then you should be fine
I will be using smartphone charger which has usb plug on it.
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