I have changed up my charge controller on my setup to a Samlex SEC2415A. It's a bit overkill, but I had bought almost 1.5 years ago for a different project and forgot about it. Those individual 12v battery maintainers sucked for this application. So far that Samlex has rocked! I recently bought a DuraComm Corp SC-24 from Tessco and have is running on my next rig to put at one of my towers, just haven't decided which one.... I digress, the Samlex in production is charging two marine batteries and maintaining at 27.0V and the Duracomm in my office is maintaing at 27.7. I wonder if that's because of temperature differences? The Samlex is in a lot hotter environment than my office is.
Sidenote: that 24V regulator died when it overheated. I have since bought some Meanwell DC-DC regulators and put a SD-100B24 (100W) into that production setup on Tuesday, and so far so good. I have a 50W and this next setup for a smaller tower. I'm pretty impressed so far with the efficiency. So far with 10 Mikrotik AP's and BH's and a 24V to 12V converter to power a switch, the switch I am only using 62 Watts of power! Less than I expected... Oh yeah, the Meanwell's are a lot cheaper than that one DC-DC regulator that you used. They have a perforated cover design that seems like they should cool easier. http://www.trcelectronics.com/Meanwell/sd-100b-24.shtml http://www.trcelectronics.com/Meanwell/sd-50b-24.shtml I'll probably get this for the next 24v to 12v. It's only 15W instead of 60W, so maybe less waste of electricity... Plus my switch uses maximum of 12v 1amp. I'm using a Netgear FS116 switch instead of a MT. I have to figure out how the MT would fit into my tower setup. http://www.trcelectronics.com/Meanwell/sd-15b-12.shtml Chris Hope I didn't hijack the thread.... -----Original Message----- From: Kristian Hoffmann Sent: Friday, May 27, 2011 6:25 PM To: [email protected] Subject: Re: [WISPA] Proper 24V battery float voltage Awesome. Just what I was looking for. Thanks both for the feedback. Have a great weekend! -Kristian On Fri, 2011-05-27 at 16:41 -0600, Scott Parsons wrote: > Basically 27.2V to 27.6V at 25C > -30mV/degree C temperature factor > Colder temperature require higher float voltage and higher temps require > lower float voltages. > > AGM and GEL would be the same. Wet Lead Acid batteries are different > charging specs. > > Hope this helps, > Regards, > Scott Parsons > Tycon Power > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Mathew Howard > Sent: Friday, May 27, 2011 3:00 PM > To: 'WISPA General List' > Subject: Re: [WISPA] Proper 24V battery float voltage > > It depends on the temperature, it's been a while since I researched it, > but > if I remember correctly I decided the best compromise around here would be > ~27.5v. you may want it a little higher or lower depending on your > climate. > > I would check the battery manufacturer's website, at least one that I > checked had a chart that showed the proper float voltage at various > temperatures. > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Kristian Hoffmann > Sent: Friday, May 27, 2011 1:30 PM > To: WISPA General List > Subject: [WISPA] Proper 24V battery float voltage > > Hi, > > Would someone mind sharing their experience/suggestion on the proper float > voltage for a 24V battery bank (2x 12V 44Ah AGM batteries)? > > I'm using the MeanWell DRP-240-24 along with a DR-UPS40. It's not a three > phase charger, but just limits the charging current to 2A. The voltage is > adjustable at the source, and will ultimately determine my charge/float > voltage. Based on my research, the highest voltage I should use is 13.8x2 > = > 27.6 to avoid boiling the batteries but still achieving a maximum charge. > I > was about to move on until I found another source suggesting that the > ideal > float voltage for telecom UPS batteries was 13.2x2 = 26.4. > > Thoughts? > > Thanks, > > -- > Kristian Hoffmann > System Administrator > [email protected] > http://www.fire2wire.com > > Office - 209-543-1800 | Fax - 209-545-1469 | Toll Free - 800-905-FIRE > > > > > > ---------------------------------------------------------------------------- > ---- > WISPA Wants You! 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