Review of Raspberry Pi's PoE+ HAT (June 2021)

The PoE+ HAT powers a Raspberry Pi 3 B+ or 4 model B over a single Ethernet cable, allowing you to skip the USB-C power adapter, assuming you have a PoE capable switch or injector.

Unfortunately, I can't recommend this new PoE+ HAT for most users, at least not in its current state.

For more background on PoE in general, and a bit more detail about the board itself and my tests, please watch my video on the PoE+ HAT—otherwise scroll past it and read on for all the testing results:

Taking control of the Pi PoE HAT's overly-aggressive fan

I am starting to rack up more Pis (quite literally) using the official Pi PoE HAT to save on cabling.

The one thing I hate most about those little HATs is the fact the fans spin up around 40°C, and then turn off a few seconds later, once the temperature is back down to 39 or so, all day long.

I'd be happy to let my Pis idle around 50-60°C, and only have the little whiny fans come on beyond those temperatures. Even under moderate load, the Pi rarely goes above 55°C in my basement, where there's adequate natural convection, so the fans would only really be necessary under heavy load.