This message was posted on behalf of Intel Corporation
Thank you for joining the Intel® NUC community.
The Intel® NUC can be powered through a 19 V DC, using a DC with a higher voltage may not perform as expected and can damage the motherboard. We recommend complying with this requirement in order to ensure the lifespan of the motherboard and its components. From my end we have only tested the Intel® NUC under its specifications.
The electrical and power supply considerations can be found on the following link: https://www.intel.com/content/dam/support/us/en/documents/boardsandkits/NUC6i7KYK_TechProdSpec.pdf