I was doing a bit of rationalising hardware at a client site and I had a spare RB260GSP. I tried connecting two UniFi devices: an AC LR and a U6+. The AC LR powered up fine but the U6+ struggled. On the switch console I saw “current too low”. Bit perplexed as according to Grok, the U6+ should work with Passive PoE and needs 24V 0.5A. The power supply is 24V 2.5A so should have sufficient umph. I was a bit short for time so didn’t check cabling but anything spring to mind? The cable run is only 2m from the switch to the access point.
It means that no more than 1A @ 11-30 V will be available from a single port.
The max total out is 2 A which is the limit that you can draw from ALL 4 Poe-out ports combined (to simplify, 4 ports x 0.5A or 2 ports x 1 A each).
Mikrotik devices tend to have a per port limit of 1 A for "low voltage" PoE 11-30 V, and of 450 mA or 500 mA for "high voltage" PoE 32-57 V.
Approximately this means 24W max power available on each port, typically 1A@24V=24W or 0.5@48V=24W.
So the RB260GSP should be more than capable to drive a 9-12W device such as the U6+.
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But I remembered 0.5A per port at most, 2A in total at 30V, but 1A total at 11V at most...
The same mame is used for CSS model, that are not the same of first RB260GSP revision "0".
Maximum power output of each ethernet port in this mode is 1 A, total for all ports 2 A. Once Power Output is
enabled in RouterOS, the Ethernet LED light turns from Green, to Red. Red LED means the port is currently
providing PoE power. For best PoE output functionality, please use the power jack to power the CSS unit.
Thanks for the clarification. I’ll do some more tests when I’m next on-site. It’s a tricky venue as it’s a wedding barn so tends to be busy all the time. They tend to get a bit upset if an IT guy starts climbing over the bar during a wedding 
P.s. on the Unifi page it just lists 44V minimum:
While the AC Line even comes with a 24 Passive PoE Adapter
There were reports that the ER-X SFP (similar to RB760iGS but with 24V passive output on its 5 RJ45, e.g. PoE similar to RB260GSP) had problems powering
EdgeRouter X SFP will not power the U6+ AP but the original post was deleted by author.
I didn't think there were any Unifi wifi 6 devices that could be powered by 24V passive.
@robmaltsystems where did the info you posted here come from? Looks like output from a hallicinating AI.
I think you nailed it 
:
(boolding is mine)
I had missed the above in the OP.
Ordinary madness 
.
Looks like it although I use Grok a lot and it’s right nearly all the time, maybe not so much with Mikrotik as it’s not as common as other devices. So I’ll let it off an occasional incorrect answer 
The specification sheet does indeed say 44—57V DC although it assumes you know that this isn’t passive PoE. I mainly wanted to connect it to the PoE switch so I can remotely recycle the power to reboot access points. So got a choice here of swapping access points or getting a non-passive PoE switch. Does Mikrotik do a 5 port full PoE switch. Shall I ask Grok?
These Artificial Deficiencies only waste time refuting all the bulls~~t they write.
Sane people start seeking the truth by starting from what they know...
...not having to determine whether something is true or not by starting from what they don't know...
To be fair, the message - in a perfect world - would have been "voltage too low" or "no suitable load", the "current too low" can be deceiving.
But I am still peplexed by the "struggled" in the report, a PoE device should either power on (if voltage/current are correct) or not power on (if the voltage and/or current are not enough).
Struggled in that the switch displayed “Current too low” for a while, stopped, then tried again.
Sorry I disagree - I find the answers to problems far faster with Grok than with Google search. Yes, you do need to be wary that the answer from AI may seem perfect when very occasionally it’s not. Before Google we had to pour over books in a library. Google (and other) search was a massive step forward. AI search takes this to the next level.
I recently had to convert a reasonably long and complex PowerShell script to Python. A language that I’m not that familiar with. Most of the time I was looking for Python equivalents of PowerShell cmdlets. The result a Grok search of “what is the python equivalent of Get-ChildItem” is far superior to Google search for the same term. Not only is it more succinct, it explains the Python code which to somebody learning Python is like having a personal teacher.
However, if we start talking about AI generating text, e.g. for reviews, CVs etc. I’m far less glowing.
I recall somebody saying “Will AI get rid of all programmers?” to which a sensible answer was “No, it’ll get rid of the ones that don’t know how to use AI effectively”.