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 *
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