Jarmo, the accumulated experience of a big group of professionals is one of the great functions of this list. This discussion is yet another of a recurring thread that documents the fuzziness of current and past battery technology and management. There are a huge number of variables, but your suggestion of documenting the position of bad cells is a good start. Hopefully the new series of smart batteries will offer better management. Thanks to all.
Bill Dorsett Manhattan, KS From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of jarmo.venalai...@schneider-electric.com Sent: Thursday, August 13, 2015 9:19 AM To: RE-wrenches Subject: Re: [RE-wrenches] Trojan Batteries Hi: It occurred to me that with all the experience on the Wrenches community, we have a unique opportunity to get perspective on one aspect of battery bank natural aging and failure. Which cells typically fail first, A. The cells on the end of the strings B. The cells in the middle of the strings C. Random cells in any position. If there is a pattern to failures among a large group of systems, then that will support cell rotation. If not, then not. JARMO _____________________________________________________________________________________ Jarmo Venalainen | Schneider Electric | Xantrex Brand | CANADA | Sales Application Engineer Phone: +604-422-2528 | Tech Support: 800-670-0707 | Mobile: +604-505-0291 Email: <mailto:jarmo.venalai...@schneider-electric.com> jarmo.venalai...@schneider-electric.com | Site: <http://www.xantrex.com/> www.Xantrex.com | Address: 3700 Gilmore Way, Burnaby, BC V5G4M1 <http://www.xantrexrebate.com/> <http://www.xantrex.com/> <https://www.facebook.com/Xantrex> <https://twitter.com/Xantrex> <https://twitter.com/Xantrex> *** Please consider the environment before printing this e-mail From: Drake <drake.chamber...@redwoodalliance.org> To: RE-wrenches <re-wrenches@lists.re-wrenches.org>, Date: 08/13/2015 07:03 AM Subject: Re: [RE-wrenches] Trojan Batteries Sent by: "RE-wrenches" <re-wrenches-boun...@lists.re-wrenches.org> _____ Most failures have been in one string of 4 or 8 batteries. One failure was in two strings of 4. At 10:26 PM 8/12/2015, you wrote: What size are the banks are are they series/paralleled across the terminals? That can cause one or more cells to fail, generally starting on the negative terminal. The set that failed on me was series/parallel across the terminals, old school, and the cell closest to the main negative overheated and shorted out, killing that string. It’s why I went to buss bars. Tom From: Drake <mailto:drake.chamber...@redwoodalliance.org> Sent: Wednesday, August 12, 2015 12:03 PM To: re-wrenches@lists.re-wrenches.org Subject: [RE-wrenches] Trojan Batteries Hello Wrenches, I have had a number of customers with Trojan L-16s have problems lately. In some cases, I know that the batteries weren't very well cared for, but in no case were the batteries totally discharged and let get cold or sit for a long time. It doesn't seem that the batteries should have died after a couple of years. I could see diminished output and a reduced life. One customer who supposedly knows someone with inside information claims that Trojan started cutting corners a few years ago to be more competitive on price. Has anyone else seen more problems with Trojan Batteries, or heard that the company is cutting corners? Thanks, Drake Athens Electric LLC OH License 44810 CO License 3773 NABCEP Certified Solar PV 740-448-7328 http://athens-electric.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 <http://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 <http://www.members.re-wrenches.org/> ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. _____________________________________________________________________________________________________________________ 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> 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> 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
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