I have a setup using a Raspberry Pi 3B. I use the PoE hat on top and I power the entire setup over PoE from a Unifi switch.
The setup has quite a lot of peripherals that need power and I use the 5 volt rail of the Raspberry to provide the peripherals with power. This has worked perfect for a year or so however lately I am having a hard time booting the RPi. Most likely because the peripherals have a high surge during startup. Sometimes I manage to start the RPi when I try it a few times and when it finally starts it can run for 6 months no problem.
Now I am thinking of possible solutions. Either I should find a separate power source for all the peripherals, but it also feels a bit complicated with different potentials and other issues. Also I would prefer not to put a plug in the wall.
The second solution I am thinking about is to swap the RPi 3 for a RPi 4 and hope that it could provide a little bit more power for my peripherals.
I find little or no info on the RPi 4 together with the PoE hat. It seem to be supported though.
Anyone who can shed some light on this for me? Is there any chance the RPi 4 would provide more amps on the 5V rail when powered over PoE? Or is there anything I can do to limit the current dras during bootup?