FAQ

Q: Can the PoE HAT (J) be used on Pi4B or Pi3B+?

A: No, the PoE HAT (J) only supports Pi5.

Q: Will there be a current limit warning on Pi5?

A: The Raspberry Pi board detects USB supply current. If the maximum 5A current is not reached, it will limit the USB (TYPE-A) output current. Since PoE HAT (J) powers the board through the 40PIN header, this current limiting situation also applies.

• Method 1: Only disable USB (TYPE-A) current limiting, without eliminating the boot-time warning message.
  • Run the following command to open config.txt for editing:

    sudo nano /boot/firmware/config.txt

  • Add the following setting to remove the 3A current limit on USB (TYPE-A) and provide 5A current:

    usb_max_current_enable=1

• Method 2: Eliminate the boot-time warning message and disable USB (TYPE-A) current limiting.
  • Run the following command to open eeprom for editing:

    sudo rpi-eeprom-config --edit

  • Add the following setting to remove the 3A current limit on USB (TYPE-A), provide 5A current, and eliminate the boot-time current limit warning:

    PSU_MAX_CURRENT=5000