Good evening
I have a rb5009upr and two Hap AC2
I would like to use the POE out of the 5009 to power the two Hap AC2, but when I put the POE auto-on I get the “short circuit” message
The 5009 is powered just by the main power supply.
Any Advice ?
Thank You
hAP ac2 does not support high-voltage. You need to power your rb5009 with 24V PSU, or use RBGPOE-CON-HP.
Which converts high-voltage to 24V.
The standard power supply for the" nornal" RB5009 is a 24V 1.5A one:
https://mikrotik.com/product/rb5009ug_s_in
the UPR is a “special” version with 48V 2A power supply:
https://mikrotik.com/product/rb5009ug_s_in
The AC2 accepts only 19-28 V (please read as 24 V) passive PoE:
https://mikrotik.com/product/hap_ac2
and needs quite a bit of power 16-21W.
16W @ 24V are 16/24=0.67 A or 670 mA
24W @ 24V are 21/24=0.875 A or 875 mA
The RB5009 UPR can provide MAX 640 mA, and of course there will be some losses due to the cable resistance (at a relatively low voltage they are more relevant).
If you keep the 48 V you can have as much as 420 mA which mean 48x.42=20.16 W still there will be some loss due to cable and some power loss in the conversion through the 48V to 24 V converter RBGPOE-CON-HP:
https://mikrotik.com/product/rbgpoe_con_hp
I would say that the 24V solution is NOT doable, the 48 V with the two converters is on the border line but should be working if the cable lengths are not excessive, check with this onlne calculator:
http://poe-world.com/Calculator/
Thank You I’ll try an adapter