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 >
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