My two cents: If you discharge part of your battery bank unevenly (pull off just half of your 24v bank to get 12v for some loads) you will have trouble with part of the bank getting over charged and part of the bank not getting charged enough. If you were charging the bank with an AC charger that charges each battery individually according to it's needs that wouldn't be a problem. But if you're charging the entire bank with a single device that charges the entire string in series like a 24v solar charger that is not a good way to go. You'd be better off with a 24v to 12v regulator.
Greg On Mon, Oct 15, 2012 at 1:44 PM, Olufemi Adalemo <adal...@gmail.com> wrote: > It just dawned on me that I may have been barking up the wrong tree > I only have the one NSM5 to connect, I could hook this up to the parallel > segment of my battery bank and get only 12v while the rest of the > installation that's connected in series gets 24v. Do you think this will > work? Don't really have to worry about the NSM5 running down the battery > cause load is low and the cable run is under 10m so the voltage drop from > 12v will be negligible > > So this is how it would be: > 24v solar panel connected to 24v charge controller with 4 x 12v batteries > connected in a 2x2 series/parallel array. cable connected to the parallel > segment of battery bank (theoretically giving 12v to the NSM5), rest of the > load connected to the charge controller at 24v > > What do you think? > - - - > *Olufemi Adalemo* > M: +234-803-5610040 > M: +234-809-8610040 > f...@adalemo.com > > > > > On Fri, Oct 12, 2012 at 8:18 PM, Kristian Hoffmann <kh...@fire2wire.com>wrote: > >> Ya, it should be +24 on pins 4,5 and -24/comm on 7,8. If it blew up >> then there was probably a short somewhere. >> >> -Kristian >> >> >> On 10/12/2012 11:11 AM, Olufemi Adalemo wrote: >> >> Ah ok, it is possible that the guys didn't get the polarity right >> I will check though they swear that they did >> >> >> - - - >> *Olufemi Adalemo* >> M: +234-803-5610040 >> M: +234-809-8610040 >> f...@adalemo.com >> >> >> >> >> On Fri, Oct 12, 2012 at 7:05 PM, Josh Luthman < >> j...@imaginenetworksllc.com> wrote: >> >>> What voltage were the batteries spitting out? They charge at 27v but >>> without a charger put out much closer to 24v until they begin discharging. >>> If it fried the radio I would first think that it was connected wrong, not >>> that the voltage was too high. >>> >>> Josh Luthman >>> Office: 937-552-2340 >>> Direct: 937-552-2343 >>> 1100 Wayne St >>> Suite 1337 >>> Troy, OH 45373 >>> >>> >>> On Fri, Oct 12, 2012 at 2:02 PM, Olufemi Adalemo <adal...@gmail.com>wrote: >>> >>>> What's your typical config for the NSM5? >>>> Some of my guys just tried to power one off a 24v battery bank (no >>>> charger connected just battery) and it fried good >>>> >>>> - - - >>>> *Olufemi Adalemo* >>>> M: +234-803-5610040 >>>> M: +234-809-8610040 >>>> f...@adalemo.com >>>> >>>> >>>> >>>> >>>> On Fri, Oct 12, 2012 at 6:56 PM, Kristian Hoffmann < >>>> kh...@fire2wire.com> wrote: >>>> >>>>> We have MT and Ubnt equipment of all shapes and sizes running at >>>>> 27.6V. The only problems we've had are a handful of freak RB411s that >>>>> won't power on with >27V. Most of the older ones wouldn't kick into >>>>> overvoltage protection until >28V, but we've come across a few odd balls. >>>>> >>>>> -Kristian >>>>> >>>>> >>>>> On 10/12/2012 10:44 AM, Josh Luthman wrote: >>>>> >>>>> Charger isn't going to spit out 24v for batteries that need charged, >>>>> it's usually 27v. >>>>> >>>>> I was under the impression they would simply lock up and you could >>>>> reboot, or maybe I'm just thinking of MT. >>>>> >>>>> Josh Luthman >>>>> Office: 937-552-2340 >>>>> Direct: 937-552-2343 >>>>> 1100 Wayne St >>>>> Suite 1337 >>>>> Troy, OH 45373 >>>>> >>>>> >>>>> On Fri, Oct 12, 2012 at 10:08 PM, Olufemi Adalemo >>>>> <adal...@gmail.com>wrote: >>>>> >>>>>> Aha, thanks >>>>>> That explains why I have a dead NSM5 on my desk >>>>>> I guess the charge controller is not very good at giving out 24v >>>>>> regulated power >>>>>> >>>>>> - - - >>>>>> *Olufemi Adalemo* >>>>>> M: +234-803-5610040 >>>>>> M: +234-809-8610040 >>>>>> f...@adalemo.com >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> On Fri, Oct 12, 2012 at 6:17 PM, Josh Luthman < >>>>>> j...@imaginenetworksllc.com> wrote: >>>>>> >>>>>>> Yes you will. The batteries will probably be around 27v which Ubnt >>>>>>> won't like. You'll need to clean the ~18-27v from the batteries to 24v. >>>>>>> >>>>>>> Josh Luthman >>>>>>> Office: 937-552-2340 >>>>>>> Direct: 937-552-2343 >>>>>>> 1100 Wayne St >>>>>>> Suite 1337 >>>>>>> Troy, OH 45373 >>>>>>> >>>>>>> >>>>>>> On Fri, Oct 12, 2012 at 1:14 PM, Olufemi Adalemo <adal...@gmail.com >>>>>>> > wrote: >>>>>>> >>>>>>>> Need help, >>>>>>>> I'm looking to deploy a UBNT NSM5 powered by a 24v solar supply. >>>>>>>> Does anyone have experience with this? The data sheet shows that it >>>>>>>> requires a 24v supply however the POE injector supplied is 15v, do I >>>>>>>> need a >>>>>>>> DC to DC converter? >>>>>>>> >>>>>>>> Best regards, >>>>>>>> - - - >>>>>>>> *Olufemi Adalemo* >>>>>>>> M: +234-803-5610040 >>>>>>>> M: +234-809-8610040 >>>>>>>> f...@adalemo.com >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> Wireless mailing list >>>>>>>> Wireless@wispa.org >>>>>>>> http://lists.wispa.org/mailman/listinfo/wireless >>>>>>>> >>>>>>>> >>>>>>> >>>>>>> _______________________________________________ >>>>>>> Wireless mailing list >>>>>>> Wireless@wispa.org >>>>>>> http://lists.wispa.org/mailman/listinfo/wireless >>>>>>> >>>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Wireless mailing list >>>>>> Wireless@wispa.org >>>>>> http://lists.wispa.org/mailman/listinfo/wireless >>>>>> >>>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> Wireless mailing >>>>> listWireless@wispa.orghttp://lists.wispa.org/mailman/listinfo/wireless >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> Wireless mailing list >>>>> Wireless@wispa.org >>>>> http://lists.wispa.org/mailman/listinfo/wireless >>>>> >>>>> >>>> >>>> _______________________________________________ >>>> Wireless mailing list >>>> Wireless@wispa.org >>>> http://lists.wispa.org/mailman/listinfo/wireless >>>> >>>> >>> >>> _______________________________________________ >>> Wireless mailing list >>> Wireless@wispa.org >>> http://lists.wispa.org/mailman/listinfo/wireless >>> >>> >> >> >> _______________________________________________ >> Wireless mailing >> listWireless@wispa.orghttp://lists.wispa.org/mailman/listinfo/wireless >> >> >> >> _______________________________________________ >> Wireless mailing list >> Wireless@wispa.org >> http://lists.wispa.org/mailman/listinfo/wireless >> >> > > _______________________________________________ > Wireless mailing list > Wireless@wispa.org > http://lists.wispa.org/mailman/listinfo/wireless > >
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