That is a great way to explain it. This also causes a lot of other issues with the cell/bank. As the one battery dies and takes less voltage the rest start taking a higher voltage and over charge and out gas leading to dry cells.
On Thu, Oct 18, 2012 at 8:49 AM, Cameron Crum <cc...@wispmon.com> wrote: > Because you are pulling more energy from a given cell. Current typically > flows in one direction at a time. If you are pulling current off of the > whole system all the time, AND pulling more from part of the system, then > there is never a chance for the system to come back to equilibrium. Think of > it like having four tanks of water each connected with siphon hoses. If you > have two hoses pulling water from one of the tanks, it will drain faster > than the other three tanks with only one hose. Your charger doesn't realize > that one cell is being drained faster as it is only looking at total voltage > across the system. > > Cameron > > > On Thu, Oct 18, 2012 at 10:36 AM, Tim Kerns <t...@cv-access.com> wrote: >> >> I just put up 2 new solar panels yesterday to replace 2 that were now to >> small of wattage to cover the expanded load at the tower. >> >> Panels with no load were putting out 35 vdc, at the batteries with load I >> was seeing 28 vdc. >> >> I use the tycon voltage regulator to maintain 24 vdc to the radios. Added >> cost, yes, but this is a remote site with important backhaul and I don’t >> need to burn a radio out. >> >> I was also taking 12 vdc from one of the batteries, but found it would >> drain it in about 2 weeks... the batteries do not charge evenly, maybe one >> of our EE members can explain this. >> >> 4 12 vdc batteries, 2 in series, then the 2 sets in parallel., most >> equipment is taken from the 24 vdc, one switch takes power from the 12 vdc. >> Why does this not keep all batteries charged equally, when using the solar >> at +27 volts. >> >> Tim Kerns >> CV-Access, Inc. >> >> >> From: Josh Luthman >> Sent: Thursday, October 18, 2012 7:49 AM >> To: WISPA General List ; fai...@snappydsl.net >> Subject: Re: [WISPA] Another Ubiquity question >> >> >> Because batteries are 27v. >> >> On Oct 18, 2012 10:45 AM, "Faisal Imtiaz" <fai...@snappydsl.net> wrote: >>> >>> Call me Stupid... but what is the point of this discussion ? >>> >>> Operating the Radios @ 27V is exceeding the Mfg. Specs. ..... >>> Will they work ? maybe... >>> Will they fail ? maybe.... >>> If you burn them up..... you are on your own.. ? or at least at >>> UBNT's discretion, since you are voiding the warranty, by operating our >>> of Specs. >>> Will it shorten the life of the Radio ? maybe... >>> Will is just work fine ? maybe..... >>> >>> This reminds me of the discussions on the CPU Over-Clockers Forum...... >>> If you want to play, sure nothing wrong with that.. but you are on >>> your own .. >>> If you expect it to preform well for a long time, then it is best to >>> stay within the Mfg. Specs ... >>> >>> I have often said this to folks.... In our industry, when you exceed >>> Specs.... things don't just 'break'.... but they do start doing 'funky >>> stuff'.... >>> >>> Of Course YMMV >>> >>> :) >>> >>> Faisal Imtiaz >>> Snappy Internet & Telecom >>> >>> On 10/18/2012 10:06 AM, Justin Wilson wrote: >>> > We see 27.3 volts at the battery. And 27.1 volts at the top with >>> > no load. >>> > Obviously load will have an impact on this. >>> > >>> > Justin >>> > >>> > -----Original Message----- >>> > From: Jeromie Reeves <jree...@18-30chat.net> >>> > Reply-To: WISPA General List <wireless@wispa.org> >>> > Date: Thursday, October 18, 2012 9:15 AM >>> > To: WISPA General List <wireless@wispa.org> >>> > Subject: Re: [WISPA] Another Ubiquity question >>> > >>> >> That depends on wire size. That distance is not going to be ethernet >>> >> so I will assume #12 AWG, 400ft, copper wire, etc. You should be >>> >> seeing a 5.6% drop under a 1amp load or about 25v under load. >>> >> >>> >> >>> >> On Thu, Oct 18, 2012 at 6:02 AM, Justin Wilson <li...@mtin.net> wrote: >>> >>> 27 volts at the base. DC has very little loss over 400-500 >>> >>> foot >>> >>> distances. We are seeing about .1 volt loss on a 400 foot run. >>> >>> >>> >>> -----Original Message----- >>> >>> From: Scott Lambert <lamb...@lambertfam.org> >>> >>> Reply-To: WISPA General List <wireless@wispa.org> >>> >>> Date: Thursday, October 18, 2012 12:16 AM >>> >>> To: <wireless@wispa.org> >>> >>> Subject: Re: [WISPA] Another Ubiquity question >>> >>> >>> >>>> On Wed, Oct 17, 2012 at 10:14:03PM -0400, Justin Wilson wrote: >>> >>>>> Many UBNT deployments running at 27volts of clean DC power. Not >>> >>>>> saying it's ideal but it works. >>> >>>> 27v at the ethernet port or 27v at the base of the tower? >>> >>>> >>> >>>> -- >>> >>>> Scott Lambert KC5MLE Unix >>> >>>> SysAdmin >>> >>>> lamb...@lambertfam.org >>> >>>> _______________________________________________ >>> >>>> 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 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 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
