As a part of a measuring project by a mobile phone on the top of a 100 meter tall mast, the mobile phone will be powered by 5V DC of a DC-DC converter output where its input voltage is 12V DC on the ground.
There are many reasons to use DC-DC converter but some of them are power efficiency and isolation of the input and output grounds which I guess is good for long distances.
So the converter and the mobile will be in an enclosure on top of a mast. In terms protection such as type of enclosure, ESD, lightning protection ect, what type of extra interface would be a good practice along with the diagram above? I marked the terminals. And does the 100 meters cable need to be twisted and shielded? Which specs should I consider to look for a DC-DC converter for such application? Do most of them have isolated input output grounds? Does anybody have experience with similar scenario?