You can float them dumb, but you *should* add a cell balancer which keeps each cell within range, they cost between $10-100 per site and aren't complicated to install, just goes to each terminal to read each cells voltage and keep it within range.
On Fri, Dec 20, 2019, 5:59 AM <ch...@wbmfg.com> wrote: > I am laboring under that same assumption. > > *From:* Adam Moffett > *Sent:* Friday, December 20, 2019 7:09 AM > *To:* af@af.afmug.com > *Subject:* Re: [AFMUG] Outdoor UPS > > > I didn't think you could put Lithium on a dumb float charger. I thought > they needed special electronics. I'm happy to be educated if I'm wrong > there. > > > On 12/19/2019 8:06 PM, TJ Trout wrote: > > Whatever you do don't use lead acid lithium batteries of varying > chemistry's are available second-hand extremely lightly-used for the exact > same price per watt hour and they will last long enough to put them in your > will > > On Thu, Dec 19, 2019, 10:50 AM Adam Moffett <dmmoff...@gmail.com> wrote: > >> Good point, I'll have to confirm that with them. >> On 12/19/2019 3:39 PM, Ken Hohhof wrote: >> >> I hope that Edgepoint doesn’t fry if the input is 1 or 2 volts above 54 >> VDC. >> >> >> >> If it sees the unregulated battery string voltage, normally you want an >> upper limit of 56 volts. 60 would be even better. >> >> >> >> >> >> *From:* AF mailto:af-boun...@af.afmug.com *On Behalf Of *Adam Moffett >> *Sent:* Thursday, December 19, 2019 2:25 PM >> *To:* af@af.afmug.com >> *Subject:* Re: [AFMUG] Outdoor UPS >> >> >> >> I could live with either AC or 48V, but 48V would be convenient. >> >> I'm looking at the Ubiquiti EdgePoint EP-S16. It takes a 54V DC input, >> has SFP+ uplink ports and twelve 802.3af/at ports. I don't actually expect >> to use every port, but in theory you could load that up to over 300W, and >> if I make sure to size the UPS for the switch then it's more idiot proof >> when people come along and add stuff. >> >> Ubiquiti has a 54V UPS module now, and you can put in 2+0 150W power >> supplies for 300W total, but it's an indoor case and operating temp only >> down to 0c. By the time I put that in a heated outdoor box it doesn't look >> too attractive anymore. >> >> I'm very familiar with the Traco and similar products. It would just be >> hard to beat $650 for a complete system using modular DIN components in a >> box. There's also something to be said for the simplicity of one part on >> the BOM. >> >> Of course I could use the smaller EdgePoint, but then I don't have the >> 10Gig uplink. >> >> I'm checking with Cyberpower on what happens in an overload >> condition...maybe the guy who adds one AP too many will realize his mistake >> very quickly. >> >> -Adam >> >> >> >> >> >> On 12/19/2019 3:05 PM, Ken Hohhof wrote: >> >> You are looking at 48VDC output, or AC with a 48V battery string? >> >> >> >> Note that unit seems to have around 700 watt hours of batteries, not bad, >> but if you are running 300W or 600W of loads, it’s not going to give you >> much runtime without adding more batteries. >> >> >> >> We have a couple Alpha Micro350 systems at some small sites, which looks >> physically similar, but that’s AC output. We only use them at small sites >> because it’s not enough batteries for a large site. Normally we would put >> a Traco TSP BCM48 and a TSP360-148 or TSP600-148 in the same enclosure with >> our other DIN rail equipment and maybe a bunch of 100 Ah batteries in a >> separate battery box. Or maybe 4 x 22 Ah batteries in the same enclosure, >> if we don’t need a lot of runtime. >> >> >> >> >> >> *From:* AF mailto:af-boun...@af.afmug.com *On Behalf Of *Steve Jones >> *Sent:* Thursday, December 19, 2019 1:33 PM >> *To:* AnimalFarm Microwave Users Group mailto:af@af.afmug.com >> *Subject:* Re: [AFMUG] Outdoor UPS >> >> >> >> hes building out UPS in a box >> >> >> >> On Thu, Dec 19, 2019 at 1:30 PM Adam Moffett <dmmoff...@gmail.com> wrote: >> >> Is there a particular item I should ask him about? >> >> On 12/19/2019 2:22 PM, Steve Jones wrote: >> >> talk to matt at CTI >> >> >> >> On Thu, Dec 19, 2019 at 12:27 PM Adam Moffett <dmmoff...@gmail.com> >> wrote: >> >> https://www.cyberpowersystems.com/product/fttx/outdoor/cs150u48v3/ >> >> I tripped over this guy the other day. They're $650-700 retail and >> frankly, that's really not a bad price for a one-and-done 48V outdoor >> power system. >> >> <whining> >> >> ....but 150W is pretty small. I wish there was a 300W or 600W option. >> Why does it seem like every product I want is a white whale and that >> every vendor has something that's like 90% of the way there, but not >> quite perfect? >> >> </whining> >> >> >> -- >> 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 >> >> >> >> >> -- >> 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 > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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