My project is currently running on POE using a TP-Link splitter that can output 5,9 or 12V. The RFID keypad is supposed to take 12V but works OK on 9V and the Arduino can handle 9V in too - there's a temperature sensor inside the enclosure to make sure things aren't getting too hot (it's been running for a few weeks now logging temperature readings every 5 minutes and hasn't melted yet :D).
However, I'm going to be changing the Arduino for a Pi clone (Orange Pi PC) for various reasons. This needs 5V/2A input so I can't just bung in 9V like before.
I've read that using a 7805 regulator could cause a lot of heat issues (mainly due to the current) so thinking of using a Buck converter.
However, here's my question...
The PoE supplies 48V to the splitter which seems to be a well made, well known item (rather than some cheap component made by me :D) so should I set the output of the splitter to 9V or 12V? The Buck converter can handle either but I don't want too much heat if I can help it.