Brian: I don't have the PV details handy but I will provide them.
Question: will a sulfated cell exhibit a SG of 1.26? I thought a sulfated cell locked the acid onto the plates, minimizing the SG readings below that of a healthy cell. 1.26 is a relatively high reading. William On Jul 23, 2013, at 1:28 PM, Brian Teitelbaum <[email protected]> wrote: > William, > > What does the PV array consist of? What size and type, and how many, modules? > > Which TriStar? 45 or 60A? > > What controller did she have before the upgrade? > > The high charging voltage might be a sign of sulfation. Depending on her load > profile, that 8A charge rate might have caused chronic undercharging. In a 5 > peak sun-hour location, that’s only 40Ah/day of charging capacity. > > Brian Teitelbaum > AEE Solar > > From: [email protected] > [mailto:[email protected]] On Behalf Of William Miller > Sent: Tuesday, July 23, 2013 1:13 PM > To: RE-wrenches > Subject: [RE-wrenches] Tri-Star MPPT > > Friends: > > I have a customer with a new Tristar MPPT controller. The customer has some > older L-16 batteries mixed with new and she thinks the controller has damaged > her batteries. I am trying to convince her that the batteries were already > damaged and mixing old with new is a bad idea. > > I removed the worst batteries from the array, leaving one string of older > batteries with reasonable SG readings. The CC still acts strangely: When > programmed to charge the L-16 batteries, the battery voltage shoots up to > 30.2 volts and the batteries boil a lot. The green light on the controller > blinks at variable rates, at one moment fast, the next slow, the next solid. > > I believe the client started with bad batteries, 6 are 4 years old, 2 are 1 > year old. She is convinced that the CC damaged her batteries. She replaced > panels and CC recently, installing the Tristar. I believe the old PV system > charged at such a slow rate (8 amps) that the battery deficiency was not > apparent. The higher charging rate has emphasized the problem. > > Any one have any thing to add to my theory? > > Thanks in advance. > > William Miller > > > > <image002.jpg> > 17395 Oak Rd. Atascadero, CA 93422 > www.millersolar.com > 805-438-5600 voice* > *Note: above number replaces cell number > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org >
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