Depends on money. If you have plenty of money I try for many days of autonomy on batts. How many days to you expect to be out of power and then double it. If you have enough batts, you don’t even need the genset.
If you are scrimping, a genset with a few batts is the best value for providing backup energy. From: Adam Moffett Sent: Monday, May 22, 2017 8:34 AM To: [email protected] ; [email protected] Subject: Re: [AFMUG] 24V Battery Revert and Charge Module Eventually you run out of space for them :) ------ Original Message ------ From: "Lewis Bergman" <[email protected]> To: [email protected] Sent: 5/21/2017 12:29:08 PM Subject: Re: [AFMUG] 24V Battery Revert and Charge Module Yea...i lean towards putting mow batteries in with the money you would have spent on a genset. On Sun, May 21, 2017, 9:50 AM Chuck McCown <[email protected]> wrote: You can always 100% rely on a standby generator not starting when you need it the most. From: Jesse Dupont Sent: Sunday, May 21, 2017 7:02 AM To: [email protected] Subject: Re: [AFMUG] 24V Battery Revert and Charge Module 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]> on behalf of Gino A. Villarini <[email protected]> Sent: Sunday, May 21, 2017 4:47:19 AM To: [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]> on behalf of Jesse Dupont <[email protected]> Reply-To: "[email protected]" <[email protected]> Date: Saturday, May 20, 2017 at 7:07 PM To: "[email protected]" <[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]> on behalf of George Skorup <[email protected]> Sent: Saturday, May 20, 2017 4:55:25 PM To: [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 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] ï¿1Ž2 Gino A. Villarini President Metro Office Park #18 Suite 304 Guaynabo, Puerto Rico 00968 on behalf of [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? >
