The BCMU does not put battery voltage to the load. Battery is 12v, load is 24v or 48v (nominal, of course).
----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP ----- Original Message ----- From: "Adam Moffett" <dmmoff...@gmail.com> To: af@afmug.com Sent: Tuesday, January 30, 2018 12:36:47 PM Subject: Re: [AFMUG] Traco BCM If you guys are right about the BCMU, I can tell you for a fact that the BCM48A puts battery voltage on the load. I have a whole stack of these things. ------ Original Message ------ From: "Paul McCall" < pa...@pdmnet.net > To: "af@afmug.com" < af@afmug.com > Sent: 1/30/2018 1:35:10 PM Subject: Re: [AFMUG] Traco BCM Actually, the BCMU is the model that takes 12v in and upconverts it to 48V. It charges the battery array (in parallel) to about 13v per batter. So, why in the world they would design a device that would upconvert that to anything less than 48v (without load) is just silly. We have UBNT EP-S16s that will not turn on radios plugged in, if it gets anything less than 45.5 to 46 volts. But, even on the BCM-148, (where you run 48v in series, it seems to have the same design) 45v max output when on battery. Pretty bizzare From: Af [mailto: af-boun...@afmug.com ] On Behalf Of Adam Moffett Sent: Tuesday, January 30, 2018 1:25 PM To: af@afmug.com Subject: Re: [AFMUG] Traco BCM When running on battery, the load gets battery voltage. The load being on battery (or charger) voltage seems to be the normal behavior for these types of systems, so you'd have to really hunt for something that does it differently. You can hunt for something with a regulated output, or add a DC-DC converter inline. I haven't yet encountered a 48V device that didn't accept the whole range from "batteries nearly dead" to "bulk charging", so I'm wondering what that device is that needs >46v. .....and I'm not a Traco lover. I'm kind of disappointed with it actually. We must have bought 40 of those kits about 3 years ago, and we now have 3 faulty BCM modules....they work except they no longer charge batteries. I also received a whole box of them where the sticker indicating which pin does what on the BCM was 100% backwards. By following the sticker rather than the manual I ended up with the temperature sensor (thermistor) connected to the reset switch. Didn't break anything, but they units won't turn on that way. At the time I needed something 48V at a higher wattage than Meanwell's 48V options, and Traco was suggested. I don't think I'd go there again. ------ Original Message ------ From: "Paul McCall" < pa...@pdmnet.net > To: " af@afmug.com " < af@afmug.com > Sent: 1/30/2018 12:59:12 PM Subject: [AFMUG] Traco BCM <blockquote> Am I missing something or are the Traco BCM series not very usable in the real world? Meaning, the BCMU360 can only put out 45v (for a couple minutes, then 44v and change), when running on the battery. Not very usable with some gear that requires about 46v to work properly. Add in voltage drop on a long run and no-go. I thought maybe the straight BCM 48v series would be better, but they appear to have the same spec. I have to think I am missing something or who the heck would they sell these to? The industry standard is 48v (54v with float) so, outputting 44v sustained seems dumb. Or is me 😊 Enlighten me please, you Traco lovers Paul McCall, President PDMNet, Inc. / Florida Broadband, Inc. 658 Old Dixie Highway Vero Beach, FL 32962 772-564-6800 pa...@pdmnet.net www.pdmnet.com www.floridabroadband.com </blockquote>
