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WalterH
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cAP ac power consumption

Thu Dec 31, 2020 1:02 pm

Hello,

The data sheet of the cAP ac https://mikrotik.com/product/cap_ac states that the cAP ac consumes 13 watts. I do not understand how such a small device can consume 13 W and then emit it as heat without a fan. The RF power is only 2 * 0.1 W. Is there an explanation why the data sheet says 13 W and how much does the cAP ac really consume?

Can someone please explain? Thank you for your support.

Walter
 
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JohnTRIVOLTA
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Re: cAP ac power consumption

Thu Dec 31, 2020 1:21 pm

Cpu and ethernet ports consume more !
 
erlinden
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Re: cAP ac power consumption

Thu Dec 31, 2020 1:22 pm

It states "Max power consumption" which is different from consuming 13 Watt. My cAP ac is consuming below 5 Watt, both WLAN's and one LAN active.
First the problem, then the solution
 
nostromog
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Re: cAP ac power consumption

Thu Dec 31, 2020 1:41 pm

Cpu and ethernet ports consume more !
With very similar hardware (same SoC) except that it has 5 ethernet ports and a USB port, the hAP ac^2 is stated as "Max consumption without attachments 16W"

I'd guess each gigabit ethernet port drains roughly a max of 1W, not taking into account the USB power requirement...

As someone else answered already, this is a maximum for a lot of CPU and comms activity. My hAP ac^2 in small setup (~10 devices, not too much traffic) works very cold with modern firmwares that control the CPU speed. Using 7.1beta3 and "auto" cpu frequency it is running most of the time at 448MHz with the occasional jump to 672MHz. CPU use is 0% most of the time, jumping to 1% when the clock speeds. The range of values is
[admin@MT] > /system/routerboard/settings/set cpu-frequency=<TAB>
448MHz  488MHz  512MHz  537MHz  565MHz  597MHz  632MHz  672MHz  716MHz  768MHz  827MHz  896MHz  auto
Of course if I start uploading encrypted data through the VPN things change.
 
WalterH
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Re: cAP ac power consumption

Fri Jan 01, 2021 11:50 am

Thanks for the replies, I asked the question because of the power, as I need to size the power supply for an 8 port switch https://mikrotik.com/product/crs112_8p_4s_in. 8 * 13 watts gives a total of 104W. The most powerful power supply I find at Mikrotik https://mikrotik.com/product/48v2a96w has but only 96W. That is not enough. The question is, can I still use this power supply to run the 8 cAP ac stable and reliable?
 
anuser
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Re: cAP ac power consumption

Fri Jan 01, 2021 1:03 pm

I use ZyXel GS1900-10HP switches for running up to 8x cAP AC without any problems. According to my monitoring the cAP AC devices never consumed more than 7W.
 
abiv
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Re: cAP ac power consumption

Fri Jan 01, 2021 8:54 pm

my ac2 never uses more than 3w with around 40% cpu load.
 
biomesh
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Re: cAP ac power consumption

Fri Jan 01, 2021 9:12 pm

My cap acs run between 3.5-4 watts during normal operation.

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