This message was posted on behalf of Intel Corporation
Thank you very much for joining the Intel® NUC communities.
As you mentioned previously and according to the TPS (Technical Product Specification) of the Intel® NUC5i5MYHE, the NUC supports a power supply of 12-19 V DC, so if you connect a power supply within that range the NUC should work fine and the performance will not be affected that way, please check page 68 for more details:
Also, I encourage all the peers viewing this thread that if they have further comments on this matter to post all the details and suggestions on this thread.
Any further questions, please let me know.