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>

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