HI Ray, I second your opinion.
jay peltz power > On Sep 1, 2016, at 4:43 PM, Ray Walters <r...@solarray.com> wrote: > > Hi Gary; > > I think it would be a waste of time to load test a sealed battery that is 9 > years old. Even at only 20% discharge, that battery only has 2800 cycles. > At 80% discharge, its 550 cycles. The daily system cycle is probably roughly > a 10% cycle, coupled with the frequent deep cycles. We have been seeing 5 to > 7 years in GTB systems with regular sealed batteries. Even in float mode, > they don't last forever. > Also the customer has already done a basic load test, and the battery is > failing. Its only a matter of time before you start seeing cell failures, > and then the system won't even work when the grid is up. > I'd just replace the set on your next trip. > R.Ray Walters > CTO, Solarray, Inc > Nabcep Certified PV Installer, > Licensed Master Electrician > Solar Design Engineer > 303 505-8760 > On 9/1/2016 2:00 PM, jerrysgarage01 wrote: >> Wrenches >> You can do a carbon pile test but the best way is testing under several >> conditions. Here is an option real easy and maybe faster, put a volt meter >> on each battery under constant charge conditions, higher volts on one >> battery meens high resistance in battery, low volts meens low resistance, >> either extreme can be an issue. Then let sit for at least an hour with no >> load and check the volts, next put a fixed load on the system, again a volt >> meter check each battery, here you may find a lower reading then the rest, >> there is the problem, now replace the entire bank not just the single >> battery. This is an easy test and the customer can see it easily too. >> Jerry >> >> >> Sent via the Samsung Galaxy S™ III, an AT&T 4G LTE smartphone >> >> >> -------- Original message -------- >> From: Gary Bassett >> Date:09/01/2016 2:51 AM (GMT-10:00) >> To: "RE-wrenches (re-wrenches@lists.re-wrenches.org >> <mailto:re-wrenches@lists.re-wrenches.org>)" >> Subject: [RE-wrenches] Test procedure for Concorde batteries >> >> 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/> >> > > _______________________________________________ > 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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