720W site? That’s some serious power. At that point it’s time for a real rectifier shelf - call these guys:
http://telecomsurplus.net/power/rectifiers/ <http://telecomsurplus.net/power/rectifiers/> They have a pretty good collection of Eltek rectifiers that would handle that load nicely. Mark > On May 21, 2017, at 9:02 AM, Jesse Dupont <[email protected]> > wrote: > > Well, that is a concern. I think we'll be under 30A after all is said and > done and the DR-UPS40 handles 40A. Downside would be the 2A charging rate. I > should note this site will have an automatic standby generator so we won't > need a huge battery string. > > From: Af <[email protected] <mailto:[email protected]>> on behalf of > Gino A. Villarini <[email protected] <mailto:[email protected]>> > Sent: Sunday, May 21, 2017 4:47:19 AM > To: [email protected] <mailto:[email protected]> > Subject: Re: [AFMUG] 24V Battery Revert and Charge Module > > How do you plan to connect to batteries for this setup ? > > From: Af <[email protected] <mailto:[email protected]>> on behalf of > Jesse Dupont <[email protected] > <mailto:[email protected]>> > Reply-To: "[email protected] <mailto:[email protected]>" <[email protected] > <mailto:[email protected]>> > Date: Saturday, May 20, 2017 at 7:07 PM > To: "[email protected] <mailto:[email protected]>" <[email protected] <mailto:[email protected]>> > Subject: Re: [AFMUG] 24V Battery Revert and Charge Module > > The Meanwell SDR-480P-24 and -48 do current sharing so you can stack up to 8 > of those in parallel to have a lot of capacity and N+1 redundancy without the > DR-RDN20 redundancy module. > > We're getting ready to do a four unit N+1 at a site that has 16-17 Amps > already and is getting some LTE base stations added to it. > > From: Af <[email protected] <mailto:[email protected]>> on behalf of > George Skorup <[email protected] <mailto:[email protected]>> > Sent: Saturday, May 20, 2017 4:55:25 PM > To: [email protected] <mailto:[email protected]> > Subject: Re: [AFMUG] 24V Battery Revert and Charge Module > > List price on the BCMU360 is about $215 IIRC. I think we pay about $175 from > PSUI. Plus $15 for the temp probe. > > Are you asking run time? I have a couple with 40Ah of battery attached. A few > with about 90W load have ran for over four hours, but they never went down, > utility came back. A couple others with ~190-220W. Lost utility at one of the > sites the other day. It was running for about an hour and a half before I > brought a portable gen out. That site didn't go down either. Couldn't let it, > too much traffic. And of course utility came back 15 minutes after I got the > generator going. > > > > Gino A. Villarini > > President > Metro Office Park #18 Suite 304 Guaynabo, Puerto Rico 00968 > <aeronet-logo_310cfc3e-6691-4f69-bd49-b37b834b9238.png> > > On 5/20/2017 4:51 PM, Gino A. Villarini wrote: >> How much are you paying for the Traco and how long does it last? >> >> On 5/20/17, 4:44 PM, "Af on behalf of George Skorup" <[email protected] >> <mailto:[email protected]> >> ï¿1Ž2 >> >> Gino A. Villarini >> >> President >> Metro Office Park #18 Suite 304 Guaynabo, Puerto Rico 00968 >> >> >> on behalf of [email protected] <mailto:[email protected]>> >> wrote: >> >> >Mean Well AD-155B >> >or >> >Mean Well SDR-240-24 + DR-UPS40 >> >or >> >Mean Well SDR-240-24 (or 48) + Traco BCMU360 (jumper selectable for 24 >> >or 48) - I use this combo most often. The BCMU360 is only good for ~240W >> >continuous. >> > >> >All this stuff is fine until you start looking to deploy things that are >> >power hungry like 450m's @ 70W, LTE eNB's that pull 60-100W each, >> >multiple AF24s or licensed radios, etc. Then you need big-boy >> >rectifiers, which aren't all that expensive, but they aren't cheap >> >either. Add good telco-grade batteries on top and it's easily 10x the >> >cost of what we're used to with the smaller stuff. >> > >> >On 5/20/2017 1:16 PM, Matt wrote: >> >> What is everyone using for switching from AC to battery backup at sites? >> >> >> >> I normally have our other guy take care of that part.ï¿1Ž2 But we normally >> >> have a DIN mount 24V power supply, a DIN mount packetflux site monitor >> >> that monitors power supply output and battery voltage and some DIN >> >> mount module that does charging and switching between the two.ï¿1Ž2 Also >> >> have a 24V to 48V converter to power our 450i etc stuff. >> >> >> >> Monitor the site monitor with SNMP and start emailing alarms if power >> >> supply voltage drops.ï¿1Ž2 Also graph power supply and battery voltage >> >> with MRTG. >> >> >> >> Curious what others are using here? >> >
