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Raspberry Pi 3 B+ PASSIVE PoE Solution

mzarycki over 6 years ago

I am looking for a PoE solution that would work with passive PoE. I have 24V @ 0.5 amps on the supply side.

Everything I have seen so far only works with active PoE.

Help will truly be appreciated!

shabaz over 6 years ago

Hi Mark,

You could take the unused wire pairs in the cable, and run your 24V supply in there. At the Pi end, use a DC to DC converterDC to DC converter to get you the 5V you need.
Make sure to write something on the cable, so that it is clear to people that it is a non-standard thing, so that it isn't accidentally connected into (say) a laptop by anyone.
PoE switches are cheap though, so once you start factoring in the cost of the 25V 0.5A supply and the effort doing the non-standard way with a DC-DC converter, a standards based method might be more preferable nowadays.
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gdstew over 6 years ago in reply to shabaz

The B+ PoE supports Class 2 PoE voltage input of 37 - 57 VDC and delivers 5 VDC @ 2.5A from its on board power supply.
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schhub over 6 years ago in reply to gdstew

Be carefull, i got my new POE hat today, but it's not working correctly, unstable and overheating the whole Pi 3B+.

It's connected to an Allied Telesys POE switch delivering 15,4W with 49V, should be enough !
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