Anything more than a few millivolts. On 10/15/12, mac Lewis <maclew...@gmail.com> wrote: > How much voltage drop indicates a problem? > > On Mon, Oct 15, 2012 at 8:13 AM, Chris Mason > <cometenergysyst...@gmail.com>wrote: > >> You should see a voltage drop across the connections if they are faulty. >> >> >> On Mon, Oct 15, 2012 at 8:54 AM, mac Lewis <maclew...@gmail.com> wrote: >> >>> Hmmm, >>> >>> This had factory installed bussing. I will pull it off and clean it up. >>> Thanks. I suppose that something like this be invisible to an Amp hr >>> meter. >>> >>> >>> On Sun, Oct 14, 2012 at 11:01 PM, William Miller >>> <will...@millersolar.com >>> > wrote: >>> >>>> Mac: >>>> >>>> We had a similar problem with a large bank of IBE 2 volt cells. The >>>> batteries had to be removed the same day they were installed and then >>>> reinstalled the next day. They sat outside for one night. The flags >>>> acquired an invisible but insidious corrosion that caused problems >>>> getting >>>> and keeping a charge. Now we insist on cleaning each flag and eyelet >>>> no >>>> more than 10 minutes prior to contact. >>>> >>>> William Miller >>>> >>>> >>>> >>>> At 09:41 PM 10/14/2012, you wrote: >>>> >>>>> Hi wrenches, >>>>> >>>>> About 2 months ago, we installed an off-grid Sunny Island System. >>>>> Here >>>>> are the specs: >>>>> >>>>> 8.82 kW PV >>>>> SunnyBoy 8000 >>>>> 2 x Sunny Island 5048 Inverters >>>>> 2490 Ahr SolarOne HUP batteries at 48V >>>>> 30 kW Cummins Propane Generator >>>>> >>>>> We are having an issue that I am having a hard time figuring out. We >>>>> are getting sagging battery voltage, and can't seem to keep the >>>>> battery >>>>> voltage and specific gravity where we want it. In addition, I have >>>>> equalized these batteries 4 times this past month, and the specific >>>>> gravity >>>>> gets to about 1.25-1.26 maximum. I have slowly eased up the boost, >>>>> absorb >>>>> and equalize voltage setpoints, to try to get the battery a better >>>>> charge, >>>>> but it doesn't seem to help. The Sunny Islands don't seem to have any >>>>> issue getting these batteries up to the equalization voltage, or any of >>>>> the >>>>> other voltage set points. I have checked for loose connections, all >>>>> look >>>>> good here. >>>>> >>>>> The SOC monitor on the Sunny Island master, calculates that we are >>>>> staying between 70-95% SOC on a daily basis, and yet the battery >>>>> voltage >>>>> has dropped below readable level a few times(I believe this is below >>>>> 41V). >>>>> I equalized at 62 V for 4 hours and had the same result of >>>>> nonimpressive >>>>> sepecific gravity and saggy voltage under small load. After we leave >>>>> from >>>>> equalizing the batteries, things seem to be OK for a while and then we >>>>> start having issues again. We are tripping a 250A battery breaker, >>>>> and >>>>> getting low voltage errors on the SI, yet SOC looks good. >>>>> >>>>> Right now I have the set points programmed per SolarOnes advice as: >>>>> >>>>> Boost Voltage= 2.46 V/cell >>>>> Full Charge Voltage = 2.46V/cell >>>>> Equalize Voltage = 2.54V/cell >>>>> >>>>> Thanks in advance for any ideas that you may have. >>>>> >>>>> >>>>> >>>>> -- >>>>> >>>> >>>> ______________________________**_________________ >>>> List sponsored by Home Power magazine >>>> >>>> List Address: >>>> re-wrenc...@lists.re-wrenches.**org<RE-wrenches@lists.re-wrenches.org> >>>> >>>> Options & settings: >>>> http://lists.re-wrenches.org/**options.cgi/re-wrenches-re-**wrenches.org<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<http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org> >>>> >>>> List rules & etiquette: >>>> www.re-wrenches.org/etiquette.**htm<http://www.re-wrenches.org/etiquette.htm> >>>> >>>> Check out participant bios: >>>> www.members.re-wrenches.org >>>> >>>> >>> >>> >>> -- >>> >>> >>> >>> Mac Lewis >>> >>> * >>> >>> "Yo solo sé que no sé nada." -Sócrates >>> * >>> >>> _______________________________________________ >>> List sponsored by Home Power magazine >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> >>> Options & 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 >>> >>> >>> >> >> >> -- >> Chris Mason >> President, Comet Systems Ltd >> www.cometenergysystems.com >> Cell: 264.235.5670 >> Skype: netconcepts >> >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Options & 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 >> >> >> > > > -- > > > > Mac Lewis > > * > > "Yo solo sé que no sé nada." -Sócrates > * >
-- Chris Mason President, Comet Systems Ltd www.cometenergysystems.com Cell: 264.235.5670 Skype: netconcepts _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & 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