802.3af was the old turn of the century standard limit of 15 watts. You can probably buy new stuff used but everything is probably 802.3at now from around a decade ago, which is twice the power 30 watts. There is a new standard came out about covid era that AFAIK is totally vaporware at this time and that goes up to 70 watts for charging laptops or whatever nonsense. WRT the newest plus products I'm a little puzzled how they put 77 volts on something rated by the fire dept and NEC as "low voltage" but that's not my paygrade LOL.
The $10 to $20 price point for "PoE Splitters" runs around 15 watts at 5v fixed and you're going to have to pay the $20 to $30 price point if you want selectable 5 / 9 / 12 volt output and more than 25 watts or so.
The place to buy these things is the security camera field. They're all about wanting a couple amps at 12 volts for IR illuminators off a PoE cable and applications similar to that.
Like a lot of no-name power equipment don't expect it to last in hot summers in an attic and don't expect to run at 99% of listed current for very long without overheating. Its better than the totally fake budget USB charger market or mostly fake ratings PC power supply market, but its not like buying engineering stuff from big names where you can trust the ratings (like a Mean Well 15 watt industrial supply will actually output 15 watts at industrial temps for a decade or so, at least so far, but you'll pay $$$ for real true ratings as opposed to consumer imaginary ratings)
If you actually need 15 watts I'd buy a "25 probably fake watts" splitter and expect a long life from it for less than $30 delivered.
The market price was about "fifty bucks" for similar just a couple years ago.
> I'm a little puzzled how they put 77 volts on something rated by the fire dept and NEC as "low voltage" but that's not my paygrade LOL.
The newer standard uses all 4 twisted pairs, so its 71W power / 48V / 4 wires == 370mA on the average on each pair of wires. Though "worst case" 960mA due to unbalanced power draw it seems.
The 4PPoE standards also run with 1Gbps protocol, meaning all 4 twisted pairs are data. So all 4 are data + power. I'm not quite sure how it all works electrically... though I loathe to be the guy to design the splitters to pull power evenly from 4 different pairs.
VLM assumed one wire pair, 71W specification, 960mA worst case current draw == 70V+.
Which was incorrect, because there's 4 wires. In PoE classic, 2-pairs were for data + 2-pairs for power. In 4PPoE, there's 4-pairs for data and the _SAME_ 4-pairs for power.
The $10 to $20 price point for "PoE Splitters" runs around 15 watts at 5v fixed and you're going to have to pay the $20 to $30 price point if you want selectable 5 / 9 / 12 volt output and more than 25 watts or so.
The place to buy these things is the security camera field. They're all about wanting a couple amps at 12 volts for IR illuminators off a PoE cable and applications similar to that.
Like a lot of no-name power equipment don't expect it to last in hot summers in an attic and don't expect to run at 99% of listed current for very long without overheating. Its better than the totally fake budget USB charger market or mostly fake ratings PC power supply market, but its not like buying engineering stuff from big names where you can trust the ratings (like a Mean Well 15 watt industrial supply will actually output 15 watts at industrial temps for a decade or so, at least so far, but you'll pay $$$ for real true ratings as opposed to consumer imaginary ratings)
If you actually need 15 watts I'd buy a "25 probably fake watts" splitter and expect a long life from it for less than $30 delivered.
The market price was about "fifty bucks" for similar just a couple years ago.