Looking to have a Pi (4) that is powered over PoE - are there any battery backup options (i.e. hats) that can be stacked with the PoE hat & supply power if/when the PoE fails (and then re-charge the battery from PoE power)?

note: I am looking for solutions that allow for the ethernet cord that is supplying the PoE to be temporarily disconnected, not options for creating a battery-backed PoE injector

  • Your can extra IEEE 802.3bt 4PPoE 2018 specifies 50W 900mA, regulate it to 5V, say, and DIY your own HAT. – tlfong01 Jul 30 at 2:10
  • @tlfong01 mind posting details of what "DIY your own HAT" would involve, i.e. what are the necessary pin connections between the Pi and the standard POE hat? – user2813274 Aug 15 at 15:42
  • Hi @user2813274, Well, let us start with the PoE HAT - Raspberry Pi PoE HAT - The Raspberry Pi PoE HAT powers a Raspberry Pi 4 Model B and Raspberry Pi 3 Model B+ via an Ethernet cable. Power-sourcing equipment is required on the Ethernet network. raspberrypi.org/products/poe-hat. – tlfong01 Aug 16 at 0:52
  • I googled the product doc but don't found updated info! :( Raspberry Pi PoE HAT product brief (Not dated, Rpi4 not mentioned) static.raspberrypi.org/files/product-briefs/…. – tlfong01 Aug 16 at 1:02
  • Our DIY PoE UPS needs to detect if the PoE 37/44+V is present. So let us refresh our memory on the PoE thing: Power over Ethernet - Wikipedia en.wikipedia.org/wiki/Power_over_Ethernet – tlfong01 Aug 16 at 1:12

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