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<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I have a decidedly skeptical opinion of
the Fronius MPP algorithm. A few years ago, I was one of the first (I believe)
to notice a curious “continuous saw tooth ramping” of the DC
current and voltage on a couple of Fronius IG4000’s. The problem (I was
told by Fronius) was triggered by an increasing Vdc crossing 240 V (the “line
voltage”). The problem was fixed by a SW upgrade. Ignoring the fact that
240 Vac is not a fixed value, the standard Fronius IG inverter line may have a
generic challenge when Vmp is in the 240 V range. Was this the case?</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></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>- Peter</span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt'> </span></font></p>
<p class=MsoNormal><img width=67 height=80
src="cid:image003.gif@01CA006D.AFE29DA0" align=left hspace=12><font size=1
color=navy><span style='font-size:9.0pt;color:navy'>Peter T. Parrish, Ph.D.,
President<br>
California Solar Engineering, Inc.<br>
820 Cynthia Ave., Los Angeles, CA 90065<br>
CA Lic. 854779, NABCEP Cert. 031806-26<br>
<a href="mailto:peter.parrish@calsolareng.com">peter.parrish@calsolareng.com</a>
<br>
Ph 323-258-8883, Mobile 323-839-6108, Fax
323-258-8885
</span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt'> </span></font></p>
</div>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<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>Bill Brooks<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, July 08, 2009
4:20 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]
Efficiency Curves of Fronius Inverters?</span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Mark and Jeff,</span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>To be clear,
manufacturers do not supply the data. It is required to be tested by a
Nationally Recognized Testing Laboratory (NRTL). Mark’s message could be
misconstrued as the data being something Fronius cooked up.</span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>On another note.
Anyone notice Fronius inverters having trouble finding max power? Of the 10
Fronius inverters I have looked at in the past 2 weeks, 4 were operating at a
voltage well above max power and losing about 10% of the available array power.</span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Bill.</span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<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>Mark Frye<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, July 08, 2009
3:43 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]
Efficiency Curves of Fronius Inverters?</span></font></p>
</div>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Jeff,</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Here is what they submitted to the
California Energy Commision:</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><a
href="http://www.gosolarcalifornia.ca.gov/equipment/inverter_tests/summaries/Fronius%20IG%204000.pdf">http://www.gosolarcalifornia.ca.gov/equipment/inverter_tests/summaries/Fronius%20IG%204000.pdf</a></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Mark Frye</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Berkeley
Solar Electric Systems</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>303
Redbud Way</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Nevada
City, CA 95959</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>(530)
401-8024</span></font> <br>
<a href="http://www.berkeleysolar.com/"><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>www.berkeleysolar.com</span></font></a><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font>
</p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center>
</span></font></div>
<p class=MsoNormal style='margin-bottom:12.0pt'><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>Jeff Clearwater,
Village Power Design<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, July 08, 2009
3:35 PM<br>
<b><span style='font-weight:bold'>To:</span></b> RE-wrenches<br>
<b><span style='font-weight:bold'>Subject:</span></b> [RE-wrenches] Efficiency
Curves of Fronius Inverters?</span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Hey Folks,</span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Anyone have or know where I can get my hands on the efficiency vs.
wattage curve for the Fronius IG series (the old series - not the Plus).</span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I have a 4000 in stock and wondering if I can apply it to a friend's
2660 watt system without losing much to efficiency at low power levels.</span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Best,</span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Jeff</span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
</div>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>There are numerous options here: most ground mount manu's offer
ballasted systems, I would look to them 1st. Other systems I've seen or used -
1) Pour a continuous surface "footer" that is large enough in size to
provide the proper ballast for the uplift in your area, pour one along the S.
edge/legs and another along the back/north legs. 2) Tie all legs together via a
horiz. rail at least 6' wide and embed this in a rock filled gabion, again of
the required weight. 3) Limestone is easy to drill, useing a hammer drill and
extension bit drill 11/16" - 3/4" holes at least 18" into the
stone at an angle, vary all angles as viewed in plan as they relate to the N/S
line of the array (not as they relate to level), to mitgate pull-out from them
all being in a line. i.e. - 1st leg hole is 90 degrees to the N/S line, 2nd leg
is 180 from this, 3rd is 45 and so on, in other words if looking in plan and
you could see all holes they would radiate around the "face of a
clock" with each leg hole on a different "hour". Finally, epoxy
in 5/8" all thread, you can pre-bend the end to come out of the hole
verticle or use a swivel connector from Uni-strut, B-line or equal.</span></font></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>All of these suggestions should be run by a Structural Engineer before
embarking, thus the 1st choice of working with a manu.</span></font></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
</span></font></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Good luck!</span></font></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>-jeff o<br>
<br>
>From the Solar, Wind and Hydro powered office of Jeff Oldham/Regenerative
SOLutions</span></font></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><font size=2 face="Times New Roman"><span style='font-size:
10.0pt'><br>
<br>
____________________________________________________________<br>
</span></font><a
href="http://thirdpartyoffers.juno.com/TGL2132/fc/BLSrjnsHGiu92lJJqoMGi0uE8kGS8cyBf0zjvb0ir0FblIZfJXPnNi0BtXC/">Protect
your home before it is too late. Click here for homeowner insurance
information.</a></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
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Check out participant bios:<br>
www.members.re-wrenches.org</span></font></p>
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<pre><font size=2 face="Courier New"><span style='font-size:10.0pt'>-- </span></font></pre>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>~~~~~~~~~~~~~<br>
Jeff Clearwater<br>
Senior Design Engineer<br>
NABCEP (tm) Certified Solar PV Installer<br>
http://www.nabcep.org/<br>
Village Power Design/NorthEast Solar Design<br>
Turnkey Solar Design & Installation for the Commercial Sector<br>
http://www.villagepower.com<br>
gosolar@villagepower.com<br>
<br>
Voice: 413-259-3776<br>
Fax: 413-825-0703<br>
65 Schoolhouse Rd <br>
Amherst, MA 01002<br>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></font></p>
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