Try Tommy Penson at North West Energy Storage at 800.718.8816 ---------------------------------------------------------------------------- Dana Orzel Great Solar Works, Inc - NABCEP # 051112-136 E - d...@solarwork.com - Web - solarwork.com O - 970.626.5253 C - 208.721.7003 "Responsible Technologies for Responsible People since 1988" Please consider the environment before printing this email.
-----Original Message----- From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Dave Sent: Wednesday, December 16, 2015 10:23 AM To: 'RE-wrenches' Subject: Re: [RE-wrenches] HuP Conundrum Luke, Contac HUP for specific advice. You've probably already done that? What comes to mind: Since you have two series strings, run the house on one string of all good cells. Pull out the weak cells and charge them as per HUP's advice. I'm guessing that this problem has happened because the homeowner did not properly charge the batteries. Homeowner most likely did not use a hydrometer upon EQ'ng the cells. Homeowner thought the cells were fully charged and equal but obviously they were not. Record keeping, log books etc.. for people caring for expensive batteries are well worth the effort. David Palumbo Independent Power LLC 462 Solar Way Drive Hyde Park, VT 05655 802-371-8678 cell 802-888-4917 home -----Original Message----- From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Luke Christy Sent: Wednesday, December 16, 2015 12:01 PM To: RE-wrenches Subject: [RE-wrenches] HuP Conundrum Hi Friends, With all of the battery threads going on right now I figured it would be a good time to start another one. I have a customer with a large off-grid system who has just started having trouble with a bank of HuP batteries. This system is 48V with 8x 12V 6-85F-27S batteries in two series strings. Charging is supplied by around 10 kW of PV. I didn't install the system and the customer has always taken care of the maintenance and watering himself. He has seemingly been pretty diligent about taking care of things, including equalizing on a regular basis. However, recently he started having voltage problems and when I made a site visit to check on the batteries, I found that 3 of the 8x 12V batteries each had a cell with SG so low it wouldn't register on my hydrometer. Obviously this is a problem, and owing to some complicating factors I'm not really sure how best to address the issue. Replacing the entire battery bank will be unbelievably expensive, especially given that the house is in a remote location and there is difficult access to the battery room. To add a another factor, the house is currently unoccupied while the owner tries to sell the property, so he is not exactly eager to invest a lot of money into battery replacement. The batteries are only 11 years old, so they should theoretically have quite a bit of life left in them. Perhaps those of you with more experience with larger batteries can advise. Can the cells be resurrected with careful charging and equalizing? What would you do? Thanks as always for opinions and advice. Luke Christy NABCEP Certified PV Installation ProfessionalT: Certification #031409-25 NABCEP Certified Solar Heating InstallerT: Certification #ST032611-03 Solar Gain Services, LLC PO Box 531 Monte Vista, CO. 81144 sgsrenewab...@gmail.com 719.588.3044 www.sgsrenewables.com _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/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: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/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: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
