Daisy-chaining Ubiquiti APs w/Unifi switch

[HCHTech]

Does anyone know how the POE power is distributed to the individual ports on the Unifi switches? Is it split evenly or as-needed?

So, I see that an AC-Pro with both bands active, for example, draws about 4-5 watts (idle, no clients). If I daisy chain 2 of these together, then the switch will need to provid 8-10 watts on that port.

So...if I have an 8-port 60 watt switch, is that 7.5watts per port maximum available power, or is it provided as required by the devices on that port up to a total limit for all ports of ~60 watts? I assume the 150, 250 & 500W switches all work the same, but I don't really know. I'm also not sure if client load affects power draw - common sense would say it would, but my ignorance proceeds me on this topic.

I'm planning an 8-AP install for my church where we can't have home runs for each AP, so don't want to buy too-little (won't work) or too-big (trying to limit expense) of a switch.

 

[SAFCasper]

Either 12W or 25W depending on model - https://help.ubnt.com/hc/en-us/articles/236325428-UniFi-USW-Supported-PoE-Output

Maximum power consumption is in this datasheet - https://dl.ubnt.com/datasheets/unifi/UniFi_AC_APs_DS.pdf

An AC-Pro is 9W so chaining 2 of them could quite easily go over that 12W budget on a US-8-60W. I'd go with a US-8-150W to be safe.

 

[Markverhyden]

I've not personally tested daisy chaining but the second port is just a bridge, no PoE, from what I have read. You should be able to use an injector on the second one. But, apparently, the IW models will pass though.

https://help.ubnt.com/hc/en-us/arti...How-do-secondary-Ethernet-ports-work-on-UAPs-

 

[nerd2u]

You could daisy chain with the second connected via a Poe injector this would mean only the first AP would draw power from the switch.

There is a max per port I believe but as stated the data sheet will have all the info you need.

Sent from my SM-G870W using Tapatalk

 

[HCHTech]

Ahh. Thanks. I new that sounded too simple. Passthrough on the AP-Pros are definitely data only, no POE, so we will need injectors for the 2nd device on any single cable. I have enough wired connections that I'll need a 24-port switch in any event, so I might as well go with the US-24-250W as opposed to a US-8-150W and an add on, non-POE switch. Which negates the power worry. If AC-Pros are 9W, then the 25W/port maximum on that switch will more than cover. It's looking like we'll have 7 AP-Pros and an IW (which is 10W for the Pro, 7W for the non-Pro)

BTW, I found the power consumption of the individual APs here.