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 *
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