Thanks for joining the NUC community.
I understand you are trying to use your NUC in a mobile environment and would like to connect it at 11-16V.
Yes, the technical product specification (TPS) for your product shows the following information:
http://downloadmirror.intel.com/23745/eng/DE3815TYBE_TechProdSpec04.pdf
Please check the picture below and see the power supply we are using with our NUC 
Thanks
Allan.