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On Mon, Jun 28, 2021 at 2:58 PM Robert <i...@avantwireless.com> wrote: > Anderson Power pole gear. > > On 6/28/21 2:33 PM, Nate Burke wrote: > > How do you distribute the 48/24v power? A row of fused links? circuit > > breakers? That's always been the part that looks cobbled together. I > > see Windstream rectifier racks with wire nuts, and wire just hanging > > out in the open, and an autozone inverter sitting on a shelf, so > > apparently even the Telco's don't always have good solutions. > > > > On 6/28/2021 12:35 PM, dmmoff...@gmail.com wrote: > >> You already pointed out the major plus to A/C power: It's simple. > >> Any joker > >> can come along and plug something in. Almost every device has a 110VAC > >> option. > >> > >> UPS's are looking cheaper because you're getting used/refurb. You'll > >> come > >> out more comparable with a new DC system compared to a new UPS with > >> similar > >> runtime and capacity. > >> > >> I've never had a UPS as reliable as a rectifier. A handful of > >> failures out > >> of dozens over several years does not actually sound reliable at > >> all. It's > >> obviously tolerable to you in your scenario, but it's not telecom > >> reliability. Scale that up to 100's of deployments and you'll be > >> chasing > >> dead UPS's more often than you'll want to. > >> > >> The good rectifier systems will be -48v because that's the standard for > >> telecom power. If you're in Ubiquiti/Mikrotik land you'll have to use > >> converters to +24V. If you're in Cisco/Juniper/Arista land then it > >> can all > >> be -48v and then you don't need the converters. > >> > >> I absolutely have been where you are now. If you're on a budget > >> where what > >> you can afford is the used APC XL then maybe you just stick with > >> that. DC > >> plant is better, but you will pay more for it and you'll pay more for > >> the > >> routers and switches designed for it. > >> > >> These are all statements of opinion, but it's opinion informed by 22 > >> years > >> of playing this game. > >> > >> -Adam > >> > >> > >> -----Original Message----- > >> From: AF <af-boun...@af.afmug.com> On Behalf Of Nate Burke > >> Sent: Monday, June 28, 2021 12:58 PM > >> To: Animal Farm <af@af.afmug.com> > >> Subject: [AFMUG] Tower UPS's (again) > >> > >> We've been using the APC SmartUPS 750XL as a Tower UPS for several > >> years. > >> Put 2-8 100+AH AGM Batteries on them, and they've been rock solid for > >> us. I > >> can think of only a handful of failures in the dozens deployed over > >> the last > >> several years. I used to source them off ebay for $50-$70 each, but > >> they're > >> becoming more and more scarce. Anybody have a recommendation for a > >> simple > >> UPS that will do all the monitoring that the APC does and accept big > >> batteries? > >> > >> We're a Metro-Rural Area, our power outages are usually measured in > >> Hours, > >> not days. So I'm not as concerned with the inefficiency of doing the > >> DC/AC/DC Conversion for Runtime, just power stability during > >> outages/fluctuations. I like the ease of connecting the external > >> batteries to the APC, since the XL line has an Anderson plug on the > >> back for > >> them, and has a larger charger than the normal UPS, so recharge times > >> are > >> very quick. > >> > >> When the boss goes to the WISPA Shows, his head is filled with all > >> kids of > >> ideas, so he want's me to investigate doing everything as a DC Plant, > >> When I > >> price that out, with chargers, voltage converters (24/48), inverters, > >> fuse > >> protection, LVD, Monitoring, etc, it always seems like the price is a > >> couple > >> hundred dollars of parts and it would be cobbled together. > >> > >> Am I missing something with doing a DC Plant? I see the telco's at the > >> sites using a rackmount rectifier with power supply modules, but > >> those are a > >> several hundred by themselves, and they are only 48V, they don't have to > >> worry about 24v radios. When I build a site now, I drop in 2 > >> batteries, and > >> the APC, and the site is up and running in a couple minutes. A DIN rail > >> with a couple power supplies and the box is done, and has fully > >> monitored > >> power, and I can plug in whatever I want without any equipment > >> modifications. > >> > >> -- > >> AF mailing list > >> AF@af.afmug.com > >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com > >> > >> > > > > > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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