Yeah, it's completely possible, and will work.... well, at least once, until the batteries are gone and need to be recharged.
The issue is the duty-cycle of the charger, your going from a 14ah to 100ah charge load, the charger has to run 7-times as long to fully charge the batteries, this may work fine with some higher end UPS, and some it might burn up the charger. Another thing to make note of, is that most UPS systems run an internal 24V system, and not a 12V system, so be SURE which one you're dealing with before you start any modifications. We're in process of developing our own remote-site power solution. Everything we've found is either too big physically, requiring expensive outdoor enclosures, or doesn't have the run-time we desire, or is too expensive. I think we've got the basic design down, we're adding things like a local power input option, so that in a long extended outage we can drop the generator off to charge the batteries and run the system, and when the utility power is restored, it will switch back automatically. We're also looking into a direct 12v input from a vehicle cigarette lighter output, or additional external batteries. Would anyone have any interest in this when we get it complete? Thanks, Russ Kreigh Network Engineer OnlyInternet.Net Supernova Technologies -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of paul hendry Sent: Sunday, March 04, 2007 12:09 PM To: [EMAIL PROTECTED]; wireless@wispa.org Subject: RE: [WISPA] External battery on UPS Scott, Surely it should be possible to replace 2 12v 7ah batteries run in parallel (not series) with 1 12v 100ah battery as the voltage isn't changing? With regards runtime I can just increase the external battery count. Mac, don't worry I have no intention of putting my tongue on these things to see if they charged ;) Cheers, P. -----Original Message----- From: Scott Reed [mailto:[EMAIL PROTECTED] Sent: 02 March 2007 12:22 To: WISPA General List Subject: Re: [WISPA] External battery on UPS The charger is designed for the size and number of batteries in the original configuration. Changing the quantity and/or type of battery risks damaging either the charger or the batteries. Also, runtime is determined by the batteries, so changing them changes the runtime. paul hendry wrote: > Is anyone using external batteries on the larger APC UPS's? I've got an > old Smart-UPS 3000 RM that has 8 x 12v batteries in it. The thing is > they are wired in a bit of a strange config. It looks to me like they > are split into 4 sets of 2 batteries running in series then 2 of those > sets are cabled to the same connector inside the UPS and so there are 2 > connectors with 4 batteries hanging of each. > > Is there any reason I can't run 2 x 2 (in series) 12v 100ah batteries > instead of the original 8? I don't seem to be able to and don't really > want to get another 4 batteries just to discover I can do it with 4. > > Cheers, > > P. > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Mark Nash - Lists > Sent: 16 November 2006 16:45 > To: WISPA General List > Subject: Re: [WISPA] External battery on UPS > > I replaced the two internal batteries last night with two external, $100 > batteries, and put a load on the UPS that matched the highest load I > have > out in the field (80w). It took 2 Tranzeo APs, an Xpeed SDSL modem, and > a > 19" TV on the QVC to load it up properly. Now instead of 1 hour I get > 13 > hours. Bigger, better batteries should net me more time than this. My > goal > is bang for buck at this stage in my business...more run time for a > sensible > price. > > One cool thing about this setup is that I can rig it up to be able to > simply > take new batteries out to a site when they are getting low, instead of > the > generator. I can keep some spare batteries charged up and ready to go. > It's a whole lot cheaper and easier than purchasing multiple QUALITY > 1000w > generators and putting large custom tanks on them. That is if your UPS > is > not on the top of a water tower or something. ;) > > Mark Nash > Network Engineer > UnwiredOnline.Net > 350 Holly Street > Junction City, OR 97448 > http://www.uwol.net > 541-998-5555 > 541-998-5599 fax > > ----- Original Message ----- > From: "Brian Rohrbacher" <[EMAIL PROTECTED]> > To: "WISPA General List" <wireless@wispa.org> > Sent: Wednesday, November 15, 2006 6:41 PM > Subject: Re: [WISPA] External battery on UPS > > > >> I'm pasting Gino's link to the right thread. >> Then I can search me email in a year and find the correct thread.... >> >> Connectors: >> >> http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=263-110 >> >> Batteries: >> >> http://www.donrowe.com/batteries/8a31dt.html >> >> >> >> Brian Rohrbacher wrote: >> >> >>> Can we get some links to these batteries that work well? >>> Gino, >>> Got a link to the DC block connectors you were talking about? >>> >>> Brian >>> >>> >>> Travis Johnson wrote: >>> >>> >>>> Hi, >>>> >>>> We run two 4 gauge power wires out the front of the case, connect >>>> > the > >>>> positive to a 60A fuse, and then to the batteries. >>>> >>>> We are using AGM type (same thing used in UPS systems) big >>>> > batteries > >>>> (a little bigger than a car battery, but each battery is 110 >>>> > pounds). > >>>> We wire them in series (to get 24VDC). >>>> >>>> This setup has only been installed for 12-18 months at various >>>> locations, so I don't have an estimate on battery life. >>>> >>>> Travis >>>> Microserv >>>> >>>> Brian Rohrbacher wrote: >>>> >>>> >>>>> You got any pics of this or similar Travis....anyone? >>>>> >>>>> Travis, >>>>> What APC do you use and what batteries are added? What do you >>>>> > draw > >>>>> and what is th run time? Do you know how many times the one with >>>>> the most cycles has been drawn down? How long do the batteries >>>>> > last? > >>>>> Brian >>>>> >>>>> Travis Johnson wrote: >>>>> >>>>> >>>>>> You can't use just 1 battery. The APC units want to see 24vdc, so >>>>>> you need two batteries running in series. >>>>>> >>>>>> It works perfectly, as I have 20+ remote locations running off >>>>>> > two > >>>>>> gel type batteries. Make sure you install some type of a fuse on >>>>>> the positive side of the connection. >>>>>> >>>>>> Travis >>>>>> Microserv >>>>>> >>>>>> Mark Nash - Lists wrote: >>>>>> >>>>>> >>>>>>> I believe I remember some discussion on this list on connecting >>>>>>> > an > >>>>>>> external battery to an APC UPS. I'm in the middle of doing it >>>>>>> right now and am having problems. The UPS just beep >>>>>>> > continuously > >>>>>>> with the 'bad battery' light on. I'm using a Lifeline deep >>>>>>> > cycle > >>>>>>> battery. Any ideas? >>>>>>> >>>>>>> Mark Nash >>>>>>> Network Engineer >>>>>>> UnwiredOnline.Net >>>>>>> 350 Holly Street >>>>>>> Junction City, OR 97448 >>>>>>> http://www.uwol.net >>>>>>> 541-998-5555 >>>>>>> 541-998-5599 fax >>>>>>> >>>>>>> >>>>>>> >> -- >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ >> >> > > > -- Scott Reed Owner NewWays Wireless Networking Network Design, Installation and Administration www.nwwnet.net -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
