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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'>This one is for the grey beards.<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'>I was asked to look at a slightly funky,
ca 10 year old, Grid-tie Battery Back Up System, with 2 ea SW5548s, 100 ea <span
class=SpellE>Astropower</span> Ap-100s, 3 ea C-40 (I think) charge controllers,
3 ea strings of 4 ea Sun Extender PVX12100T (100 A-hr) batteries. The PV
modules are wired in strings of four. II strings reside on a west facing garage
roof (3:12) and 14 strings reside on a south facing main house roof (3:12). Strings
are combined using Pulse combiners with up to 8 PV circuits on the input. Everything
was buttoned up in rain proof cabinets in such a way as to make inspection (including
observation of LCD displays) very difficult. Not a lot of wire marking, etc.<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'>The client called us to look at the system.
Prior to my arrival, the client had done two things:<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo5;
tab-stops:list .5in'><![if !supportLists]><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;mso-fareast-font-family:Arial;
color:navy'><span style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>One
battery string had been decommissioned due to a bad battery and<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo5;
tab-stops:list .5in'><![if !supportLists]><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;mso-fareast-font-family:Arial;
color:navy'><span style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
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</span></font></span></span></font><![endif]><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>One of
the inverters had been put into bypass because of fluctuating output and noise <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'>We put the inverter in question “on
line” and sure enough the critical loads (bathroom lights for example)
began to fluctuate on a ~1 sec interval. The inverter also had a fairly loud
continuous hum punctuated by a “<span class=SpellE>boing</span>”
which occurred at exactly 1 sec intervals. After a while (10 minutes) the
fluctuations went away and so did the “<span class=SpellE>boing</span>”
but the inverter still exhibited a loud hum.<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'>I spent a lot of time looking at the PV
strings, circuit combiners and the inputs to the CCs. Everything actually looked
okay, except for one loose PV circuit input at a circuit combiner. Due to the
way the inverters and CC are installed in the cabinets (CC in the back and
inverters face up in front of them), It is very hard to trace wires and view
displays/<span class=SpellE>LEDs</span>.<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'>The AC voltages appeared okay (117.5 to
119.6) and here is what we got on the AC currents:<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'>Inverter A (funky one)<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'>AC Hot In1, 9.58 A <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'>Neutral In 1, 10.09 A<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'>AC Hot Out, 1.47 A <o:p></o:p></span></font></p>
<p class=MsoNormal><span class=SpellE><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Vdc</span></font></span><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>=56.4 V<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'>Inverter B <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'>AC Hot In1, 7.2 – 8.4 A<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'>Neutral <span class=GramE>In</span> 1, 8.6
– 9.4<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'>AC Hot Out, 1.57 – 1.86 A<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'>(<span class=GramE>these</span> currents
were fluctuating and my clamp on ammeter has about a 1 sec settling time) <o:p></o:p></span></font></p>
<p class=MsoNormal><span class=SpellE><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Vdc</span></font></span><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>=54-64 V<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'><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'>Where do I start with this system? Obviously
out of warranty, but people on this email list seem to like these old inverters.
What do the symptoms suggest? Is there a company that repairs these inverters?
What kind of additional diagnostics should perform? The customer would like to
keep the battery back up functionality (which we didn’t test), so for now
I would like to focus on determining the problem(s) and fixing it (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'>- Peter<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>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy;mso-no-proof:yes'><!--[if gte vml 1]><v:shape
id="_x0000_s1026" style='position:absolute;margin-left:0;margin-top:0;width:50pt;
height:50pt;z-index:1;visibility:hidden' coordsize="21600,21600" o:spt="100"
o:preferrelative="t" adj="0,,0" path="" filled="f">
<v:stroke joinstyle="miter" />
<v:formulas/>
<v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect" />
<o:lock v:ext="edit" aspectratio="t" selection="t" />
</v:shape><![endif]-->Peter T. Parrish, Ph.D., President<br>
<st1:State w:st="on"><st1:place w:st="on">California</st1:place></st1:State>
Solar Engineering, Inc.<br>
<st1:address w:st="on"><st1:Street w:st="on">820 Cynthia Ave.</st1:Street>, <st1:City
w:st="on">Los Angeles</st1:City>, <st1:State w:st="on">CA</st1:State> <st1:PostalCode
w:st="on">90065</st1:PostalCode></st1:address><br>
CA Lic. 854779, NABCEP Cert. 031806-26<br>
<a href="mailto:peter.parrish@calsolareng.com">peter.parrish@calsolareng.com</a><span
style='mso-spacerun:yes'> </span><br>
Ph 323-258-8883, <st1:City w:st="on"><st1:place w:st="on">Mobile</st1:place></st1:City>
323-839-6108, Fax 323-258-8885 </span></font><font size=1 color=navy
face=Arial><span style='font-size:9.0pt;font-family:Arial;color:navy;
mso-no-proof:yes'><span
style='mso-spacerun:yes'> </span></span></font><font
size=1 color=navy><span style='font-size:9.0pt;mso-bidi-font-family:Arial;
color:navy;mso-no-proof:yes'><span
style='mso-spacerun:yes'> </span><span
style='mso-spacerun:yes'> </span></span></font><font
color=navy><span style='mso-bidi-font-family:Arial;color:navy;mso-no-proof:
yes'><o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-no-proof:
yes'> </span></font><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;font-family:"Times New Roman";color:windowtext'><o:p></o:p></span></font></p>
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