Gary I would suggest that the battery manufacture’s recommended method is followed. Yeah it IS time consuming BUT… Checking w/ a clamp on during a charge or discharge depending on the # of strings &/or the way the strings are configured will be misleading. Your customer is paying by the hour and a the choice is theirs replace OR pay your tech to watch the voltage/current over the manu’s discharge time. These batteries can be run thru an equalization cycle, following the guide lines recommended by Concord, then do your load test. Full charge to discharge over time IS the only way. > On Sep 1, 2016, at 8:51 AM, Gary Bassett <g...@hudsonsolar.com> wrote: > > We have a grid tied battery backup system that uses 8 Sun Xtender PVX-2120L > batteries, about 9 years old. The grid has been going out frequently – about > 4 times in the past 3 weeks. When the grid goes out, the battery voltage gets > too low and shuts the system down pretty quickly. One of the times, this > happened within 4 hours. We want to test the capacity of the batteries and we > have a testing procedure from Concorde that seems like it would take a lot of > time. Is there a quick way to test the battery capacity? > > Gary > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > <mailto: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 <http://www.re-wrenches.org/etiquette.htm> > > Check out or update participant bios: > www.members.re-wrenches.org <http://www.members.re-wrenches.org/> > t...@swnl.net > <blocked::mailto:t...@swnl.net%22%20%5Co%20%22blocked::mailto:t...@swnl.net> > www.SWNL.net > <blocked::http://www.swnl.net/%22%20%5Co%20%22blocked::http://www.swnl.net/> > 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" >
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