Most systems will operate down 2 volts without a problem. Warrants reconfiguring but often the homeowner won't even notice for a few days. In the past month I have had Outback and Sunny Island customers running down a cell. Sunny Island is reconfigurable to manage the situation better.
Removing a single cell is losing less stored capacity than removing an entire string. Matt On Wed, July 25, 2018 2:32 pm, t...@wagonmaker.com wrote: > So you're willing to risk total system shutdown if a single cell fails? > It just seems like a big risk even if the batteries are considered > highly reliable. I always planned to minimize the risk of failure causing > a power outage. A buss bar arrangement with more strings provides > redundancy and reduced downtime while still being very stable, more stable > than an interconnected series/parallel arrangement. > > Tom > > > On 2018-07-25 00:39, Tump wrote: > >> Perhaps suggesting the correct amp Hr battery bank would eliminate the >> _need_ for buss bar. 2 volt EX1400 1K amp hour batteries work very >> well good warrantee. all the fusing & interconnects would be eliminated. >> MORE AHs = less interconnects, always the correct way to >> go! >> >>> On Jul 24, 2018, at 9:40 AM, Dave Tedeyan <dtede...@taitem.com> >>> wrote: >>> >>> >>> Thank you all for the ideas and suggestions. This person in >>> particular had #4 wire for the battery connections, so they are all >>> getting replaced with anyway. So it seems like rewiring to a busbar >>> with fuses will be the way to go. And although not ideal to have so >>> many strings, this will be more cost effective than just getting a >>> whole new battery bank right off the bat when they have 10 batteries >>> that have essentially never been used. >>> >>> Cheers, >>> Dave >>> >>> >>> -- >>> >>> >>> Dave Tedeyan >>> >>> >>> SENIOR ENGINEER >>> >>> >>> TAITEM ENGINEERING, PC >>> 10 Verizon Lane, Lansing, NY 14882 >>> Voice: (607) 930-3481 x6 >>> www.taitem.com [1] On Mon, Jul 23, 2018 at 8:50 PM, Glenn Burt >>> <glenn.b...@glbcc.com> >>> wrote: >>> >>> >>> Hi Christopher, >>> >>> >>> I buy my copper buss material from McMaster Carr in appropriate >>> dimensions for the current I am expecting. >>> >>> I then cut it to the lengths I need, drill for appropriate size >>> fasteners and use 2 layers of heat-shrink tubing to protect the exposed >>> bar. >>> >>> Hope this helps. >>> >>> >>> -Glenn >>> >>> >>> FROM: RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> ON >>> BEHALF OF Chris Schaefer >>> SENT: Monday, July 23, 2018 2:28 PM >>> TO: RE-wrenches <re-wrenches@lists.re-wrenches.org> >>> SUBJECT: Re: [RE-wrenches] 5 battery strings >>> >>> >>> What source are you all using for buss bars for these multiple >>> battery string set ups? >>> >>> Christopher >>> >>> >>> On Mon, Jul 23, 2018 at 2:16 PM, <t...@wagonmaker.com> wrote: >>> >>> >>> Separate out the individual series strings and run each string to a >>> buss bar setup. Remember it isn't just resistance differences between >>> batteries but resistance difference between cells as well. In a setup >>> like the existing one the resistance differences can really add up and >>> if one battery fails the entire system will be offline. Running each >>> string to a positive and negative common buss bar means you can remove >>> individual strings without disrupting the entire storage and the >>> system can continue operating. Also, it means the only resistance >>> issues of substance are within individual series pairs not the entire >>> interconnected bank. >>> >>> I ran 10 series pairs of 12v AGM batteries, each pair to a common >>> buss and it was the longest lasting, most stable battery bank I had. >>> That was years ago and now it would require fusing each string but >>> for longevity and stability it is the best bet. >>> >>> Tom >>> >>> >>> On 2018-07-23 03:56, Dave Tedeyan wrote: >>> >>> >>> Since we are on the topic of bad battery practices... >>> >>> >>> I may be fixing up a system that was both designed and installed >>> very poorly. They have a 24V Outback VFXR inverter, and ten 12V AGM >>> batteries wired into 5 parallel strings. I know that is a bad idea, but >>> since they already have the equipment, are there any safety issues by >>> re-using this equipment? It >>> is for a grid tie battery backup system that will remain in float most >>> of the time. I assume that the batteries will not last particularly >>> long, but is there any harm in using them and then just getting new >>> batteries once they fail? >>> >>> Stringing is shown in the attached picture. >>> Cheers, >>> Dave >>> >>> >>> -- >>> >>> >>> Dave Tedeyan >>> >>> >>> SENIOR ENGINEER >>> >>> >>> TAITEM ENGINEERING, PC >>> 10 Verizon Lane, Lansing, NY 14882 >>> Voice: (607) 930-3481 x6 >>> www.taitem.com [1] [1] >>> >>> Links: >>> ------ >>> [1] http://www.taitem.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 >>> [2] >>> >>> >>> List-Archive: >>> >>> >> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist. >> html >>> [3] >>> >>> >>> List rules & etiquette: >>> www.re-wrenches.org/etiquette.htm [4] >>> >>> Check out or 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blocked::http://www.swnl.net/%22%20%5Co%20%22blocked::http://www.swnl.ne >> t/ [8] http://www.solarandwindfx.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.h >> tml >> >> 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.ht > ml > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > Matthew Partymiller Solar Energy Solutions LLC (877) 312-7456 m...@solar-energy-solutions.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
