Hi Jay, The SOC is typically around 75%-85% or so when the 2 minute start triggers. We are hitting absorb voltage around noon typically.
Thanks On Sat, Apr 20, 2019 at 8:47 PM Jay <[email protected]> wrote: > Hi Mac. > > 2 questions I have are, what is the soc at 2 min start? > And > How long does it take to get absorb volts > > Thx > Jay > > > > > > On Apr 20, 2019, at 6:18 AM, Mac Lewis <[email protected]> wrote: > > 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 <[email protected]> > 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 < >> [email protected]> 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 <[email protected]> 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 <[email protected]> *On >>>> Behalf Of *Starlight Solar Power Systems >>>> *Sent:* Friday, April 19, 2019 3:10 PM >>>> *To:* RE-wrenches <[email protected]> >>>> *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 <[email protected]> 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: [email protected] >>>> >>>> Change listserver email address & settings: >>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>>> >>>> List-Archive: >>>> http://www.mail-archive.com/[email protected]/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: [email protected] >>>> >>>> Change listserver email address & settings: >>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>>> >>>> List-Archive: >>>> http://www.mail-archive.com/[email protected]/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: [email protected] >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> >>> List-Archive: >>> http://www.mail-archive.com/[email protected]/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: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/[email protected]/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* > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/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: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/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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