It is extremely rare that a 2V cell like Trump is refering fails causing loss of power to the home. There is often plenty of warning that an informed offgrid owner would have that something is wrong. The last point is the inverter and charge controllers have enough range that they can operate the system with a missing 2V battery until one is obtained if that happened.
2V systems are much more reliable in my experience than strings of 6V batteries. Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ e-mail offgridso...@sti.net text 209 813 0060 On Wed, 25 Jul 2018 08:32:15 -1000, 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 update participant bios: >>> www.members.re-wrenches.org [5] >>> >>> _______________________________________________ >>> 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 update participant bios: >>> www.members.re-wrenches.org [5] >> >> -- >> >> Chris Schaefer’s >> [8] >> Tel/Fax 585-229-2083 or Cell 585-748-1870 >> 5115 South Hill Road ~ Canandaigua New York 14424 >> www.solarandwindfx.com [8] ~ E-mail: _chris@solarandwindfx.com_ >> >> __ >> >> Thomas Jefferson, the author of our great Constitution, once said, >> "democracy" will cease to exist when you take away from those who are >> willing to work and give to those who would not." >> 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bios: >> www.members.re-wrenches.org >> >>> t...@swnl.net [6] WWW.SWNL.NET [7] >>> >>> Solarwinds Northernlights _ _ >>> _ SERVING MID COAST MAINE & NORTHERN CALIFORNIA_ >>> _ 207-832-7574 CL. 610-517-8401 >>> _ >>> _ __BLAIR "TUMP" MAY_ >>> >>> ******** MAINE'S CHARTER ******** >>> _ __ NABCEP "CERTIFIED PV INSTALLER"_ >>> >>> ******** MAINE'S CHARTER ******** >>> _ TRACE XANTREX "CERTIFIED" DEALER / INSTALLER"_ >> >> >> >> Links: >> ------ >> [1] http://www.taitem.com/ >> [2] >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> [3] >> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >> [4] http://www.re-wrenches.org/etiquette.htm >> [5] http://www.members.re-wrenches.org/ >> [6] >> blocked::mailto:t...@swnl.net%22%20%5Co%20%22blocked::mailto:t...@swnl.net >> [7] >> blocked::http://www.swnl.net/%22%20%5Co%20%22blocked::http://www.swnl.net/ >> [8] http://www.solarandwindfx.com/ >> _______________________________________________ >> List 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