So to follow up on this post and answer my own question. Yes the RB1100AHx2 will not run on 29.5v. It did not power up when I tried and it appears it also did not damage it which is nice. I went to the site today and powered it up with 24v power supply swapped in place of the 29.5v.
My original reason for wanting the 29.5v power supply was to be sure the ePMP 1000 units would activate the heater in cold winter and boot if powered off for any amount of time. I realized over the weekend they were being powered on the 48v side of things so I didn't need to worry about it and could step down to 24v for the backhauls, and old FSK, and mikrotik without an issue. Thanks for all the help everyone. Brandon From: AF [mailto:af-boun...@af.afmug.com] On Behalf Of Ken Hohhof Sent: Friday, December 07, 2018 7:46 AM To: 'AnimalFarm Microwave Users Group' Subject: Re: [AFMUG] Mikrotik Poe In 29.5v? 1100AHx2? If you're exceeding the voltage rating of some component in the router, it may fail over time not immediately. On the other hand, Mikrotik may have come up with the 28 volt number with 24 volt battery voltage in mind, not because their circuitry can't handle 30 volts. What is generating your 29.5 volts? Is it a power supply with a voltage adjustment that you could crank down to 28 volts? Is the 29.5 volts for some Cambium APs? They would probably be fine with 28 volts. I guess it depends how critical this tower is, and whether you have a spare router on hand in case the extra 1.5 volts actually does damage it. I used to be an EE designing products, and I would not have designed something so close to the published specs that 105% of spec would cause damage. But we live in different times, now it's more like 90% of spec is good enough, so you never know. But my guess would be the 28 volt number came from marketing and doesn't necessarily mean the router can't handle 30 volts. You could take this logic to an extreme, though. Maybe it can handle 32 volts. What about 48 volts? Or 60 volts? Let's crank up the voltage and see what happens. I remember I got confused at a tower with a mix of 450 and 450i APs when we were replacing equipment after a lightning storm, and powered a 450 AP with 48 volts. Everything ran fine. For about 2 days, at which point the AP was toast. From: AF <af-boun...@af.afmug.com> On Behalf Of Brandon Yuchasz Sent: Friday, December 7, 2018 7:17 AM To: 'AnimalFarm Microwave Users Group' <af@af.afmug.com> Subject: Re: [AFMUG] Mikrotik Poe In 29.5v? Yes it's the discontinued model RB2011AHx2. I did some testing last night with a slightly different model and it ran just fine on the 29.5v. Obviously the Ahx2 has slightly lower specs so I am going to have to go to the site to figure out testing. I'm powering it with the Rackmount unit from Packetflux so I have the option of adding a third power supply at 24 volts and powering the routers with it but I would prefer not to have a third power supply as its just something else to fail. From: AF [mailto:af-boun...@af.afmug.com] On Behalf Of Ken Hohhof Sent: Thursday, December 06, 2018 10:01 PM To: 'AnimalFarm Microwave Users Group' Subject: Re: [AFMUG] Mikrotik Poe In 29.5v? Do you mean RB2011 or RB1100AHx2? Or maybe AHx4? The AHx2 appears to be discontinued but spec sheet says 28V max? RB2011 says 30V max. RB1100AHx4 will take up to 57V. From: AF <af-boun...@af.afmug.com> On Behalf Of Brandon Yuchasz Sent: Thursday, December 6, 2018 7:30 PM To: af@af.afmug.com Subject: [AFMUG] Mikrotik Poe In 29.5v? I am walking out to the truck to grab some parts and do some living room floor testing here shortly but if anyone wants to save me the trouble. Will the RB2011 AHX2 run on 29.5v poe or does it have to be 24v? I'm fairly sure based on my work earlier today the 29.5v is to much. Thanks, Brandon
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