Why not use 48v? I have been designing my farming robot's electrical system and it all runs on nominally 45 volts. The switching power supply you need to downregulate that to 12, 5, or 3.3v (I have all three on one PCB) is tiny and cheap. [1]
No matter what voltage or power level you need, higher voltage will allow for smaller/cheaper wires and connectors that are easier to route and assemble.
No matter what voltage or power level you need, higher voltage will allow for smaller/cheaper wires and connectors that are easier to route and assemble.
[1] You can browse the Kicad PCB design directly in the browser with this handy web viewer. The power section is the top left: https://kicanvas.org/?github=https%3A%2F%2Fgithub.com%2FTwis...