If you have a Thunderbolt 3 powered monitor (e.g., it get's all of it's power from a Thunderbolt 3 connection + no power chord), and the power demand is 100W or less, and you have a proper Thunderbolt 3 cable, then these NUCs should be able to power it.
As for a replacement for your monitor's power brick, there are some pretty ingenious types out there who just might create the right interface cable with a DC power plug tip on one end and the TB 3 for the NUC. It should be possible, not heard of that as an option.
You would lose much of the TB3 capability if used only for dc power.
Thunderbolt™ 3 is a very high-speed (40Gbps), daisy-chainable interface that allows connection of multiple peripherals and displays to a computer. Thunderbolt™ 3 uses a USB Type-C™ connector which combines PCI Express (PCIe Gen3), DisplayPort (DP 1.2), USB 3.1 Gen2 and provides up to 100W of DC power, all in one cable.
I get my Thunderbolt 3 cables for the NUC8i7HVK from this link on http://https//www.amazon.com/gp/product/B074JZVD2M/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1 Amazon
I'm sure that I can source these for less cost, but I've not researched that (yet). The important part of these cables is the 100W rating.
I did a quick internet search for Thunderbolt 3 Powered Monitors (they get all of their power from TB3) and LG has a very nice looking 5K monitor, https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Delectronics&field-keywords=LG+27MD5KB-B+U... LINK HERE
I'm using one of the TB3 ports to power a Universal Audio - Audio Interface device, called the Arrow. You can see it at the https://www.uaudio.com/audio-interfaces/arrow.html LINK HERE
I'm aware of the "up to 100W" specification of Thunderbolt 3, and that the Hades Canyon has Thunderbolt 3 ports. However, I asked this question previously, and was told that they could only output 5V and up to 3A ( ). I think it's cheap to call them Thunderbolt 3 ports when they are clearly significantly below the power specification of Thunderbolt 3, and don't offer variable voltage. The power specifications aren't much better than USB 3!
The connector to my monitor is a 12V DC barrel. Using another monitor isn't possible for my application.
I'm not worried about using up my Thunderbolt 3 port only for power delivery. I'd like to take advantage of the up to 230W of power available on this machine to power my monitor.
I'm aware of the internal SATA power connector. SATA power can apparently supply up to 1.5A on each of the DC power lines (3x3.3V, 3x5V and 3x12V for up tp 91.35W of power). However, I'm not sure what the maximum power output of the internal SATA connector on Hades Canyon is, and since the Hades Canyon doesn't have any gaps to route the cable out of, I'm reluctant to use this.
Do the ports on the NUC support USB Power Delivery?
https://en.wikipedia.org/wiki/USB_(Physical)# PD USB (Physical) - Wikipedia
In July 2012, the USB Promoters Group announced the finalization of the USB Power Delivery (PD) Specification, an extension that specifies using certified PD aware USB cables with standard USB Type-A and Type-B connectors to deliver increased power to devices with larger power demand. Devices can request higher currents and supply voltages from compliant hosts – up to 2 A at 5 V, and optionally up to 3 A or 5 A at either 12 V (36 W or 60 W) or 20 V (60 W or 100 W).
Just posted an answer on your original thread,
I think intel need to change *their* description of TB 3 technology. When they say 100W, they really need to be specific that this is for charging devices across TB3, not the actual 15W total power output for that port.