Supplying power to your Raspberry Pi network setup can become a messy and expensive task, especially if you use multiple Pi or want to install your Pi in a remote area. The solution? Network and power through a single Ethernet cable. Now with 802.3at support, the upgraded PoE + HAT allows you to do just that.
Power over Ethernet (or PoE) is a technology that allows network cables to carry electrical power, eliminating the need for additional power cables or outlets. The technology is commonly found in VoIP phones and security cameras, as it reduces clutter and makes powering to areas without a power outlet easier, cheaper, and safer.
The Raspberry Pi Foundation announced its first PoE HAT in 201
But the new PoE + HAT supports both 802.3af (15.4 watts) and 802.3at (25.5 watts) PoE standards. In combination with compatible network equipment, it can power the Raspberry Pi 4 with maximum load via a single Ethernet cable. While it will still struggle with demanding USB accessories, the new PoE + HAT is a major upgrade from its predecessor and a necessity for some networking projects.
Along with its increased power capabilities, the new PoE + HAT offers enhanced thermal performance thanks to a new planar transformer (replacing the old wirewound transformer) and a new Microchip PD70224ILQ “ideal” diode rectifier. This new diode rectifier should also make the PoE + HAT more energy efficient than its predecessor.
Orders for the PoE + HAT will open in June through select retailers. Like its predecessor, it only costs $ 20 and works with both the Pi 3B + and Pi 4. The Raspberry Pi Foundation says it will continue to produce the original PoE HAT.
Source: Raspberry Pi foundation