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
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