Hello, I was called to repair a system. 24 volt 8 strings of Group 31 AGM batteries. I had not self-destructed yet. For the repair, I insisted on the strings being on individual breakers of 20 amps on equal length #12 wire to balance the charging. This is a battery backup system. I recommended replacement of the batteries and a complete rebuild and that I felt the system was unsafe. That was 8 years ago, no problems yet with the system I am hoping the next repair happens before disaster.
On Mon, Jul 23, 2018 at 8:56 AM Dave Tedeyan <dtede...@taitem.com> 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 > _______________________________________________ > 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 > >
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