If I'm looking at the same thing, that one has a built in AC/DC power supply... it's just adjusting the output voltage of the power supply, and there's no DC-DC converter involved, so it makes sense to just run on battery voltage (as far as I can tell it needs 24v or 48v batteries).
On Tue, Jan 30, 2018 at 12:36 PM, Paul McCall <pa...@pdmnet.net> wrote: > Yet, the BCM-148 says adjustable Output up to 54v. Unless you are on > battery. Silly > > > > *From:* Af [mailto:af-boun...@afmug.com] *On Behalf Of *Paul McCall > *Sent:* Tuesday, January 30, 2018 1:35 PM > > *To:* af@afmug.com > *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 <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 > > > > 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 > <https://maps.google.com/?q=658+Old+Dixie+Highway%0D+Vero+Beach,+FL+32962%0D+772&entry=gmail&source=g> > > Vero Beach, FL 32962 > <https://maps.google.com/?q=658+Old+Dixie+Highway%0D+Vero+Beach,+FL+32962%0D+772&entry=gmail&source=g> > > 772-564-6800 <(772)%20564-6800> > > pa...@pdmnet.net > > www.pdmnet.com > > www.floridabroadband.com > > > > > >
