Note it will do 125 to 250 on AC On DC, contact self welding can be a concern. If the current is low I don’t think I would worry about 48 volts.
I learned this lesson the hard way once at a solar site. I used regular Home Depot light switches on some 48 volt circuits. Was not too long before none of the switches were good. I think they shorted on. But maybe they burned and were open. In any event ruined for certain. Use that relay to trigger an external relay that is guaranteed to work. From: Nate Burke Sent: Thursday, November 17, 2022 10:50 AM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Outdoor DC Distribution That looks intriguing. DC power on the relays says only up to 30V though. And Would still require external fusing for each link? I have a couple sites where I ran multiple fibers but only a single 12/3 to the top to power an Edgepoint that was powering AF11's. I'm upgrading more sites from AF11 to Bigger radios, and am trying to minimize having to pull new cables. At most sites it's easy enough to just pull new cables for each radio, but at some of the grain elevators, the cable path is quite convoluted, and the installers yell and complain about having to pull wires. Interestingly, they also yelled and complained about wanting to pull spares initially. The Mikrotik NetFiber9 will give me the extra 10G ports on the existing fiber, can power it off the Edgepoint, so that part is easy. Just need to figure out the power to the radios. Aviat can do POE, but not the POE that the edgepoint outputs, so I run it through a double set of GIGE-POE, one to take the UBNT 56v and convert to 2 wire, then a 2nd to convert the 2wire into Aviat POE. But at that site, I have a large NEMA on a nice platform, so everything is DIN mounted in that with lots of room. On 11/17/2022 11:34 AM, Jason Wilson wrote: I'm just starting to use these for some VERY remote sites. https://www.tyconsystems.com/tpdin-monitor-web3 Jason Wilson Remotely Located Critical Infrastructure Service Provider Providing High Speed Internet to out of the way places. 530-651-1736 530-748-9608 Cell www.remotelylocated.com On Thu, Nov 17, 2022, 09:31 <[email protected]> wrote: I've used the PDU at the bottom of the tower. My only complaint at the time was the character limit on port description. I think it was 11 characters or some such....I had to come up with some cryptic abbreviations when I really wanted to say "Power to Telrad Compact 1000 - 270 azimuth". I think they were talking about fixing that in a future version of the base unit, but I haven't used any packetflux lately so I don't know if that's still an issue or not. If you're powering 100W radios then you'd be limited to 3 per PDU. A fourth radio would put you over the 8A total. That wasn't an issue in my deployment, but if you're planning 4+ sectors per tower then that's something to be aware of. Next problem is wire gauge. Anything bigger than 14ga is gonna have trouble squeezing into the connector on the packet flux PDU. Voltage drop on 48V /8A with 14ga is going to be pretty severe at 300ft, but if the tower is short then it's probably ok. I was deploying on 70ft poles, and we ran 16ga up to each radio so it was acceptable, but feeding the 8A input on the packetflux PDU on a taller site could be an issue. In any case I'd advise separate cables. I know it seems wasteful, but you can have any tower dude climb up there and put the green plug into the green hole. If you want the tower climber to strip and terminate DC cables then you'd have to be careful who you send up there. If you're dead set on a single power run then something with built in breakers is a good idea. Packetflux PDU would fit that bill. -----Original Message----- From: AF <[email protected]> On Behalf Of Nate Burke Sent: Thursday, November 17, 2022 11:48 AM To: Animal Farm <[email protected]> Subject: [AFMUG] Outdoor DC Distribution Mikrotik makes a nice outdoor fiber switch with a handfull of 10G ports. Does anyone make something similar for DC Distribution? Run a single power cable up a tower and DC to multiple radios? I'm thinking like 3 or 4 licensed radios each needing 2 wire DC input and 10G fiber. Rather than running individual power wires for each one. I've used a UBNT Edgepoint S16, taking the 56v POE Output ports, and running them through the MCT GIGE-POE to extract 2wire power to run to the radio. But that's extra pieces needing a place to be mounted. Would the Site Monitor 5 channel PDU fit the bill? IT says 3A per channel, and 8A total. So in theory that should be able to provide about 140w per radio. Could put it in some sort of NEMA with a DIN mount. The Sitemonitor base is hardened, would the PDU be as well? Are there other options? -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -------------------------------------------------------------------------------- -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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