I was thinking about an 8 port switch that can provide my 8 RPi's 4 power over POE.

I think i have found one according to my needs ( small dimensions), namely the: Ubiquiti EdgeSwitch 10XP - https://www.ui.com/edgemax/edgeswitch-10xp/

With a PoE budget: 150W

Would this be sufficient?

  • Well, it depends on the current you are driving the Rpi 4's. Suppose the PoE voltage is 40V, and each Rpi is sinking 1A, then the total power is 40 x 1 x 8 = 320W, and the switch might explode! :) – tlfong01 Oct 29 at 0:31
  • @tlfong01 This cannot be true. The RasPi is consuming 1-2A on 5V not on 40V. – Ingo Nov 8 at 9:27
  • @Ingo, I am very sorry. I made a silly careless mistake. I forgot the Rpi PoE HAT has a switching power supply, converting 40V DC to 5VDC. Now let me do the arithmetic again: (1) The power required for 8 x Rpi's = 8 x (5V x 2.5A) = 80W. (2) However the 8 port switch is powered by an AC/DC adapter of 24V 1A = 24W. (3) Therefore, very very roughly the 8 port switch can only entertain 80W / 24W == 4 Rpi's. (4) But there is another BIG PROBLEM : the switch PoE voltage is only 24V DC, but Rpi PoE HAT requires 37V - 57V. In other words, the SWITCH IS NOT COMPATIBLE TO to Rpi HAT! – tlfong01 Nov 8 at 13:29
  • These are the references I googled: (1) EdgeSwitch 10X/XP (External Power 24V DC 1A AC/DC Adapter, All RJ45 Port Output 24V Passive PoE) Datasheet - Ubiquiti Networks dl.ubnt.com/ds/edgeswitch_x_ds (2) EdgeSwitch Config Interface V1.8 UserGuide - Ubiquiti Networks 2018/2019 dl.ubnt.com/ug/edgeswitch_ug.pdf (3) Rpi3B+/Rpi4B PoE HAT (Switching Power Supply 802.3af PoE, Input 37–57V DC, Output 5V/2.5A DC) rpi.org raspberrypi.org/products/poe-hat / to continue, ... – tlfong01 Nov 8 at 13:30
  • (4) Rpi3B+/Rpi4B PoE HAT Product Briefs - rpi.org static.raspberrypi.org/files/product-briefs/… – tlfong01 Nov 8 at 13:31

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