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Hi Gary;<br>
<br>
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.<br>
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.<br>
I'd just replace the set on your next trip.<br>
<pre class="moz-signature" cols="72">R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760</pre>
<div class="moz-cite-prefix">On 9/1/2016 2:00 PM, jerrysgarage01
wrote:<br>
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<div>Wrenches</div>
<div>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.</div>
<div>Jerry</div>
<div><br>
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<div><br>
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<div>
<div style="font-size:9px;color:#575757">Sent via the Samsung
Galaxy S™ III, an AT&T 4G LTE smartphone</div>
</div>
<br>
<br>
<div>-------- Original message --------</div>
<div>From: Gary Bassett <gary@hudsonsolar.com> </gary@hudsonsolar.com></div>
<div>Date:09/01/2016 2:51 AM (GMT-10:00) </div>
<div>To: "RE-wrenches (<a class="moz-txt-link-abbreviated" href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>)" <re-wrenches@lists.re-wrenches.org>
</re-wrenches@lists.re-wrenches.org></div>
<div>Subject: [RE-wrenches] Test procedure for Concorde batteries
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:12.0pt">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? <o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Gary<o:p></o:p></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;color:black"> </span><span
style="color:black"><o:p></o:p></span></p>
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