I have PoE power source which can suddenly switch from 48v to 24v (actually it is RB5009 with 2 power sources).
I need to power device which can take maximum 28V (actually it is a hAP ax²)
To do it, I think I can use MikroTik 48 to 24V Gigabit PoE Converter.
But the question is will it work if there will be 24V on convertor input? I’d infinitely appreciate if someone could try.
Do you need an actual Mikrotik product or it can be a 3rd party one? As in, do you need to cover a single case so DIY is an option or you need tens/hundreds of them? There are so called “step up/down” converters out there that can work with input voltage both below and above the output one, or you can make use of the fact that the ax² and other similar devices can run from even less than 24 V and use a plain step-down converter that makes, say, 20 V from 24 to 60 V.
…aaand an update, have you seen https://i.mt.lv/cdn/product_files/APA-1_240618.pdf ? Looks like the exact answer to your needs to me… except the PoE part of course, you still need an extractor at the hAP end.
Not to nitpick, but the product brochure is confusing.
Better to read the (anyway scarce) product manual.
https://help.mikrotik.com/docs/display/UM/APA-1
Given an IN voltage (that depending on which line of the brochure you read maxes out at 48V, 57V or 60V), there are TWO out voltage terminals (and a common ground):
A step down converter needs (generally speaking) 2-4V more in Input than the voltage you can obtain on Output.
So if you use the PASS with 48V IN you get 48V on it (or maybe 47.95V), and if you use 24V you get 24V on it (or maybe 23.95V).
If you use the OUT with 48V IN (setting it at 24V through the jumpers) you get 24V, but if you use the OUT with 24V in ( in the same configuration of jumpers) I doubt you will get 24V (more likely anything between 20 and 22V.
For a hap ax2 the voltage on OUT will be fine:
DC jack input Voltage 12-28 V
PoE in input Voltage 18-28 V