If power source can handle the NUC's power brick consumption, and has the proper capabilities regarding power, that shouldn't be a problem, this hasn't been tested as far as I know and could fail.
I cannot assure you it is going to work properly.
Power brick specs:
Input: 100-240V~1.5A 50-60Hz
Output: 19V 3.43A 65W max
If you require any further information or support, feel free to contact us back.