Fun with GL iNet devices and USB extension cords:
AR150 worked with 81' of USB extension cords, => 4.5 volts ~0.05 to 0.10 amperes.
AR300M16-EXT worked with 45' of USB extension cords, => 4.5 volts ~0.05 to 0.10 amperes
USB150 worked with 45' of USB extension cords => 4.4 volts ~0.14 amperes.
Measurements were made at maximum 'Tx Power'.
Power supply used was a 'Wireless Gear' 5 volt (5.1v apparent), 2.1 amp (labeled) wall-wort USB charger.
The USB cables used were of high frugality (cheap) and
measurements were made with a 'Keweisi USB Detector'...ergo dubious accuracy.
:-|
YMMV
Chuck
Generally USB power adapters are SMPS and world power compatible, so probably work down to 100V, if not lower.
I'd be curious how cheap one can get 'usb extenders' vs an extension cord, even lamp cord. I know some usb cables are power only, with the power and grounds lines hooked up, but without any run of the data lines.
Now I imagine a building with a usb device and power in all the plugs. Full mesh, very un-obtrusively.
I can think up an experiment with an extension cord, but with a draw of what, 1/10th of an amp, and probably more like 1/100th, the voltage drop is probably in the noise for any practical purpose.