Thanks for all of the comments. My big question is *do these batteries operate at lower voltages than a standard lead battery*. From what I'm gathering from this list, they do not. I am fairly certain its a battery problem, in fact, I think that there may be a bad cell as Alan suggests.
As far as Flexnet DC calibration, I do think this system is calibrated. We get to charge voltage and end amps daily and it corresponds to 100% SOC. The solar keeps up with load easily esp with this generator run-time. We are making about 130% of what is being used. The AGS start is done the "standard" way through the Aux relay on the master, not via FNDC relay. I haven't used that relay because calibration issues are so prevalent. I think its back to the basics with cell testing. All of the comments are very much appreciated. On Fri, Apr 19, 2019 at 9:49 PM Darryl Thayer <darylsol...@gmail.com> wrote: > Jay has a real strong point. If you are near low voltage low state of > charge. Two or 4 hrs from a 4kw array is only 8 to 16 kwh nowhere near 46 > kwh. Given the recomended max charge rate is C/5 you would have to be > charging for days > > On Fri, Apr 19, 2019, 10:20 PM John Blittersdorf < > john.blittersd...@gmail.com> wrote: > >> Mac, >> If there is a TriMetric or charge controllers, you can get min/max >> voltages each day or since last reset. I have found that is very useful >> info when large, short duration loads hit. ie well pump. I would find on >> one of my 24 v systems that an 18 or 19 v min would indicate that the well >> pump went on when the batteries were quite low and pulled the voltage down >> to low battery cutoff. If the system does not shut down, you might see a >> voltage lower than the 2 minute setpoint. I think the FlexNet DC also >> records minimum voltage. And be sure that the gen start trigger is not the >> flexnet as that is big trouble. >> >> John Blittersdorf. >> >> On Fri, Apr 19, 2019 at 8:06 PM Glenn Burt <glenn.b...@glbcc.com> wrote: >> >>> Hi Larry, >>> >>> >>> >>> I am curious why you would use the 100Hr rate for this approximation and >>> not the 20 or 24Hr one, since that is the period in which Mac is reporting >>> the anomaly. Happy to learn the details! >>> >>> >>> >>> Thanks, >>> >>> Glenn >>> >>> >>> >>> *From:* RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> *On >>> Behalf Of *Starlight Solar Power Systems >>> *Sent:* Friday, April 19, 2019 3:10 PM >>> *To:* RE-wrenches <re-wrenches@lists.re-wrenches.org> >>> *Subject:* Re: [RE-wrenches] Operating Voltages Outback RE High >>> Capacity Battery >>> >>> >>> >>> Mac, >>> >>> >>> >>> Only removing 6kWh from 46kWh of storage should not be able to produce >>> the voltage sag to trigger AGS. That’s only about 13% at a 100Hr rate. >>> Voltage should be no where near that point. Have you verified actual >>> voltage when the AGS is triggered? Loose wiring or terminal corrosion can >>> cause voltage drop but I would think that an easy find/repair you would >>> have checked. >>> >>> >>> >>> Saying the battery easily charges to 100% worries me as sulfated >>> batteries do that. Healthy LA batteries take many hours to reach full >>> saturation. Has cell voltage been compared for non-uniformity? Has the >>> equalization charge been performed? >>> >>> >>> >>> I am not a fan of the unusual low voltages that Outback prescribes for >>> EnergyCells and seriously wonder how these voltages can properly maintain >>> these cells. CV is below the point where balanced O2 and H2 evolution takes >>> place. But, thats off point. >>> >>> >>> >>> >>> Larry Crutcher >>> Starlight Solar Power Systems >>> >>> >>> >>> >>> >>> >>> >>> On Apr 19, 2019, at 10:27 AM, Mac Lewis <maclew...@gmail.com> wrote: >>> >>> >>> >>> Hello Wrenches, >>> >>> >>> >>> We recently inherited an Outback system that I've been keeping an eye on >>> via Optics. Its a dual stack 3648 VFXR, with about 4kW of PV with a single >>> string of EnergyCell 1100RE battery bank (reported to be ~6 months old) >>> ~.46 kWh at C20. >>> >>> >>> >>> I have been observing how the system functions and how the voltage >>> behaves. We keep getting 2 minute voltage starts on the generator in the >>> middle of the night that don't seem necessary judging from how much energy >>> has been used from the battery bank. I am hesitant to tweak anything >>> because these battery set-points are a bit different than I'm used to. >>> >>> >>> >>> As per Outback: >>> >>> Absorb Voltage is 55.6V for 2 hours >>> >>> Float Voltage is 54.0V >>> >>> >>> >>> I've slowly been dropping the 2 minute start voltage to see if there is >>> a bottom, but I'm hesitant to take it much lower (maybe I should). >>> >>> 2 minute start voltage: 44.8 V. >>> >>> >>> >>> >>> >>> The system easily charges the battery bank to 100% (and easily reached >>> the 2 hr absorb time) every day. The flexnet DC is correctly set up and >>> calibrated. >>> >>> >>> >>> The load on the system is pretty consistent. They use between 400 and >>> 600W throughout the night. >>> >>> >>> >>> An average night, they may use about 6 kWh before the voltage sags below >>> the 2 minute start voltage and it starts the generator. >>> >>> >>> >>> Just curious if our 2 minute voltage needs to be dropped or if these >>> batteries are degraded. What corrective changes can I make to get better >>> performance? >>> >>> >>> >>> I have and will call Outback about this, but I'd like other perspectives >>> as well. >>> >>> >>> >>> Thanks as always for your expertise >>> >>> >>> >>> -- >>> >>> >>> >>> >>> >>> >>> >>> Mac Lewis >>> >>> >>> "Yo solo sé que no sé nada." *-Sócrates* >>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> >>> List-Archive: >>> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >>> >>> List rules & etiquette: >>> www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> www.members.re-wrenches.org >>> >>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> >>> List-Archive: >>> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >>> >>> List rules & etiquette: >>> www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> www.members.re-wrenches.org >>> >>> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> >> _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > -- Mac Lewis *"Yo solo sé que no sé nada." -Sócrates*
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