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[mUPS] Powering PowerBOX Pro with 3 devices

Posted: Thu May 16, 2019 9:25 am
by planetcaravan
Hello,

I'm trying mUPS for the first time.
I got this scenario: 1 PowerBOX Pro is powering 1 NetMetal (RB921UAGS-5SHPacD) and 2 Dynadish 5 (total power consumption is less then 20 W).
All cable are long less than 10 meters. All is working fine. I would like to power up the PowerBOX Pro using mUPS with an external 12 volts 54 AH GEL battery.
It will be a good scenario for power continuity?

Re: [mUPS] Powering PowerBOX Pro with 3 devices

Posted: Thu May 16, 2019 12:42 pm
by mkx
You'll have to do some power budget calculation.

mUPS brochure specifies maximum PoE out max 0.7A @ 24V, which is 16.8W ... or 1A @ 20V (when on battery) which is 20W.
PowerBox Pro itself consumes up to 9W (typical power consumption is less, but definitely at least a few W). I don't think PoE in is a factor here, it comes with PoE injector and 24V 2.5A power adapter, so I'd expect PoE in should be able to sustain at least 2.5A.

My gut feeling is that mUPS won't be up to the job, you'll have to find a better UPS solution.

Re: [mUPS] Powering PowerBOX Pro with 3 devices

Posted: Thu May 16, 2019 1:54 pm
by planetcaravan
Thanks for answering. Anyway I should use PowerBox Pro power supply connected to the mUPS, correct?

Re: [mUPS] Powering PowerBOX Pro with 3 devices

Posted: Thu May 16, 2019 2:02 pm
by mkx
As I wrote: mUPS power output rating is a bit low for what you want to have, so you'll have to use some UPS solution other than mUPS.

There were numerous problem reports, where it turned out that power supply was inadequate and all sort of random problems were happening (mostly random device restarts). With mUPS and powerbox in the chain, anything could happen (including mUPS power regulator blowouts).