Depending on mounting, I really like the BlueSea marine fuse blocks. https://www.bluesea.com/products/5031/ST_Blade_Fuse_Block_-_12_Circuits_with_Negative_Bus
On Mon, Jun 28, 2021 at 4:35 PM <[email protected]> wrote: > Message: 4 > Date: Mon, 28 Jun 2021 16:33:39 -0500 > From: Nate Burke <[email protected]> > To: AnimalFarm Microwave Users Group <[email protected]> > Subject: Re: [AFMUG] Tower UPS's (again) > Message-ID: <[email protected]> > Content-Type: text/plain; charset=windows-1252; format=flowed > > 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, [email protected] 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 <[email protected]> On Behalf Of Nate Burke > > Sent: Monday, June 28, 2021 12:58 PM > > To: Animal Farm <[email protected]> > > 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 > > [email protected] > > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > > > > > > > ------------------------------ > > Subject: Digest Footer > > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > ------------------------------ > > End of AF Digest, Vol 37, Issue 146 > *********************************** >
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