<font face="arial" size="4">"<span class="187435412-04102010"><font>The battery choice was the
decision of the system owner."<br><br>Since when does the customer make these decisions?<br><br>Todd<br></font></span><br>On Monday, October 4, 2010 6:36am, "North Texas Renewable Energy Inc" <ntrei@1scom.net> said:<br><br>
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<div><span class="187435412-04102010"><font face="Arial">Todd</font></span></div>
<div><span class="187435412-04102010"><font face="Arial">I've heard the same
arguement, as well as its inverse. The battery choice was the
decision of the system owner. I know they are more sensitive to
charge/discharge abuse but I see the full charge rate last week at
52.xx V, just like day 1and I trust the Trimetric and the Sunny
Islands. </font></span><span class="187435412-04102010"><font face="Arial">We're
taking down the entire system to upgrade & install a 400A transfer switch so
the batteries will have time to stabilize for the VOC check & cleaning.
</font></span></div>
<div><span class="187435412-04102010"><font face="Arial">I guess a more accurate
question would be is it good enough to properly check cell VOC and not
bother with the discharge capacity check? A compromise could be cap
check 12V blocks of cells instead of all 24 separately. Or is the
capacity checker a waste of money.</font></span></div>
<div><span class="187435412-04102010"><font face="Arial">Jim</font></span></div>
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<div><font face="Tahoma" size="2"><span class="187435412-04102010"> </span>----Original Message-----<br><b>From:</b>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org]<b>On Behalf Of
</b>toddcory@finestplanet.com<br><b>Sent:</b> Monday, October 04, 2010 2:23
AM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] Battery
capacity testers<br><br></font></div><font face="Tahoma" size="2"></font>
<blockquote><font face="arial" size="4">I know many on this list disagree, but
this sounds SO typical for sealed batteries. It is why I never use em...
never! If they are 5 years old, you are probably at the limit of their life.
Replace em with flooded lead calciums and your customers (and you) will be
happy for 20+ years.<br><br>my .o2<br><br>Todd<br><br><br><br>On Sunday,
October 3, 2010 9:28pm, "North Texas Renewable Energy Inc"
<ntrei@1scom.net> said:<br><br>
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<div><font face="Arial"><span class="937293103-04102010">I have a customer with a
set of 24 Concord PVX-6480s that have twice failed during grid outages during
the night. No large loads are on the critical load panel and, since it's at
night when they drop to 50% dod, I'm not sure what's up with them.
</span><span class="937293103-04102010">I plan on cleaning and retightning all
the cable connections first to eliminate that possibility then checking
VOC of each cell.</span> </font></div>
<div><font face="Arial"><span class="937293103-04102010">Eventually we'll install
a 25 kW genset but my first task is to find out the state of the batterys. The
system turns five next spring so I don't think they are near an early
death. </span><span class="937293103-04102010">The BOS is 2 Sunny Island 4248s
with upgraded chipsets and the charger is set to spec though that may need to
be bumped up. The only culprit I suspect is the high summer temperatures
in this unconditioned equipment room. </span></font></div>
<div><font face="Arial"><span class="937293103-04102010">Finally it may be time to
invest in a capacity tester. What brand is popular among those
Wrenches with lots of experience in diagnosing a batterys health? The
Concord DC5000 only comes in 12 & 24 V models and these are 2V cells.
</span></font></div>
<div><font face="Arial"><span class="937293103-04102010">Thanks as
always</span></font></div>
<div><font face="Arial"><span class="937293103-04102010"></span></font> </div>
<div>
<div>Jim Duncan</div>
<div>North Texas Renewable Energy</div>
<div>486 W.N. Woody Road</div>
<div>Azle Texas 76020</div>
<div>
<div>
<div>NABCEP Certified Solar PV</div>
<div>Installer No.31310-57</div>
<div>TECL 27398</div></div></div>
<div><a href="mailto:ntrei@1scom.net">ntrei@1scom.net</a> </div>
<div>817.917.0527</div>
<div><a href="http://www.ntrei.com/">www.ntrei.com</a></div>
<div><font face="Arial"></font> </div><font face="Times New Roman"></font></div></font><br><br><br>Sent from Finest Planet
WebMail.<br></blockquote></font><br><br><br>Sent from Finest Planet WebMail.<br>