We supply ours with 24v which is ideal for building 7cell LIFEPO4 prismatic battery homemade UPS.
Then we use a step-up for sites that require 48v gear.
https://www.amazon.com/Converter-5A-Wat ... B089M7FVLJ
You could put a simple stepdown onto the 24v side and do something similar so there is no need to run two lines.
My biggest problem with the netpower16 so far, is that we use this adapter POE-CONV-2AT-60 (and give up a port) to get all four pairs powered for devices like AF24 and AF11FX.
https://www.balticnetworks.com/tycon-po ... -converter
This solution works great when we enable both the slave and master port on the netpower16 at the same time. However, when rebooting the netpower16 it gives a "current too high error" on one port and refuses to power the device until I manually disable both ports and re-enable them at the same time. I need to figure out a script to run on reboot to handle this scenario because as of now the link to the site won't come up after rebooting the netpower16 and I lose my connection to the device. I'm crossing my fingers this will be addressed in a firmware update.
Otherwise, we are loving these netpower16 devices, once ROS v7 is more stable and they can do simple L3 routing -- they'll be perfect tower "master hub" devices!