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<DIV><SPAN class=468011121-04102010><FONT face=Arial>We bid only on the
installation of the system.The design was done by a NM company. There's a lot of
things I would have done different. In hindsight the SMA product, 5 inverters
& 2 SIs have worked flawlessly for 5 years though my choice at that
time would have been Outback. </FONT></SPAN></DIV>
<DIV><SPAN class=468011121-04102010><FONT face=Arial>Jim</FONT></SPAN></DIV>
<BLOCKQUOTE>
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----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 3:24
PM<BR><B>To:</B> RE-wrenches<BR><B>Subject:</B> Re: [RE-wrenches] Battery
capacity testers<BR><BR></FONT></DIV><FONT face=arial size=4>"<SPAN
class=187435412-04102010><FONT size=+0>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></FONT></SPAN> </DIV>
<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>
<DIV><SPAN class=187435412-04102010></SPAN><FONT face=Tahoma size=2><SPAN
class=187435412-04102010><FONT face=Arial
size=3></FONT></SPAN></FONT> </DIV>
<DIV><FONT face=Tahoma size=2><SPAN
class=187435412-04102010></SPAN></FONT> </DIV>
<DIV><FONT face=Tahoma size=2><SPAN
class=187435412-04102010></SPAN></FONT> </DIV>
<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
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