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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>My .02 would be a close examination of the
batteries, and a realistic realignment of their expectations of their capacity.
</span></font>12 sun extender sealed <span class=yshortcuts><span
style='background:#DCEEFF'><span style='cursor:hand' id="lw_1219089563_1">AGM
batteries</span></span></span>, 305 AH at 12 vdc, wired for 915 AH at 48 volt DC
<font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>-- sounds like those are the PVX-2580. They’re
only rated 305AH at the 120 hour rate. If you’re hitting that bank
with a fast discharge rate (is 104 amps at 120v or 240?), you’ll do
better to consider the bank’s capacity at the 24 hour rate (258AH) or
even 1 or 2 hour rate ( 165 and 209 AH respectively). Realistically,
those three strings of batteries are really a 774, 627 or even a 495 AH bank,
depending on how fast you’re discharging them.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Make sure the batteries have temperature
compensation on all charging sources, and that the batteries are not exposed to
high temperatures. All batteries are affected by temperature, but if VRLA
batteries are charged without temperature compensation when in a hot
environment they will lose electrolyte which cannot be replaced. Additionally,
ensure all connections are good and tight, and that the bank’s series and
parallel connections are sized adequately to handle the surge. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Finally, check the LBCO settings on all
the XW inverters. I can’t remember the default setting, but my
memory was that it is a little too high – especially when the battery
bank is small and surge loads are high. I worked on a troubleshoot the
other week where the installer set the LBCO only a bit below the AGS Start DCV 30
second voltage, on an older battery bank of questionable capacity. Unfortunately,
the batteries bottomed out before the generator could get started and the
system shut down a couple times.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Director, Battery-based and Off-grid</span></font><font
color=navy face=Arial><span style='font-family:Arial;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Conergy Sales & Systems, <st1:country-region
w:st="on"><st1:place w:st="on">Americas</st1:place></st1:country-region></span></font><font
color=navy face=Arial><span style='font-family:Arial;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><strong><b><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>Our World Is Full of
Energy</span></font></b></strong><font color=navy face=Arial><span
style='font-family:Arial;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=PT-BR
style='font-size:10.0pt;font-family:Arial;color:navy'>1730 Camino Carlos Rey
Suite 103</span></font><font color=navy face=Arial><span lang=PT-BR
style='font-family:Arial;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=PT-BR
style='font-size:10.0pt;font-family:Arial;color:navy'>Santa Fe, NM 87507</span></font><font
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><a href="mailto:p.undercuffler@conergy.us"><span
lang=PT-BR>p.undercuffler@conergy.us</span></a></span></font><font color=navy
face=Arial><span lang=PT-BR style='font-family:Arial;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=PT-BR
style='font-size:10.0pt;font-family:Arial;color:navy'>Direct | 505.216.3841</span></font><font
color=navy face=Arial><span lang=PT-BR style='font-family:Arial;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Toll Free | 888.396.6611 x4841</span></font><font
color=navy face=Arial><span style='font-family:Arial;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Fax | 505.473.3830</span></font><font
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><a href="http://www.conergy.us/">www.conergy.us</a></span></font><font
face=Arial><span style='font-family:Arial'><o:p></o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Max Balchowsky<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, August 18, 2008 2:01
PM<br>
<b><span style='font-weight:bold'>To:</span></b> RE-wrenches<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [RE-wrenches] offgrid
system question</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div id=yiv193486330>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Dear wrenches, going to look at a system installed by others and would
like some input from some of you with more off grid experience than I have ( 4
systems over the years). the system was put on a new home - off grid 20 sharp
ND123UJF panels 4 modules in series - 5 parrallel strings, 2460 total
array dc voltage. mppt 60-150 <span class=yshortcuts><span style='background-attachment:
scroll;background-position-x:0%;background-position-y:0%;cursor:hand'
id="lw_1219089563_0">charge controller</span></span>, 12 sun extender sealed <span
class=yshortcuts><span style='background:#DCEEFF'><span style='cursor:hand'
id="lw_1219089563_1">AGM batteries</span></span></span>, 305 AH at 12 vdc,
wired for 915 AH at 48 volt DC. The system is tripping off when the AC unit
trys to start - AC is comfortmaker 3.5 ton 13 seer. They say start up inrush is
104 amps (sounds high to me) and they put a DST 10 <span class=yshortcuts><span
style='cursor:hand' id="lw_1219089563_2">soft start</span></span> on the unit
(I think that's just a big capacitor). I haven't been on site yet but it sounds
to me that they just didn't design enough inverter capacity into the
system...... What are your thoughts?<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Max Balchowsky<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>SEE Systems<o:p></o:p></span></font></p>
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