Do you have any NUC model you could provide to us?
In case you are looking for power supply requirements, I recommend checking the technical product specification (TPS) for NUC here:
first of all im looking for an NUC5i5RYK or NUC5i3RYK.
Since id like to run the NUC of a normal AGM battery my question is : am i able to run the NUC. The low Voltage is about 11v an the charging voltage is 14.8v.
In your technical documentation you write 12 - 19v . The question is the tollerace and the exact minimum voltage.
I know the posebillety of a dc dc converter but i think this option would cost an extra amount of power...