I have a design which is literally just 2 connectors (input and output), a relay and a diode. Basically using the relay to connect a charger to a battery.
The board size is predetermined and I can't decrease it. It seems like I have plenty of space to comfortably route everything in 1,2 or 4 layers.
The current from input to output could get up to 30A.
Considering board prices between 2 and 4 layer boards is pretty similar these days, is there any reason I should proceed with 2 layers instead of the 4?