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<title>Efficiency Curves of Fronius Inverters?</title>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Mark and Jeff,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
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.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
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.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Bill.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org]
<b>On Behalf Of </b>Mark Frye<br>
<b>Sent:</b> Wednesday, July 08, 2009 3:43 PM<br>
<b>To:</b> 'RE-wrenches'<br>
<b>Subject:</b> Re: [RE-wrenches] Efficiency Curves of Fronius Inverters?<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>Jeff,</span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>Here is what they submitted to the California Energy Commision:</span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><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><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mark
Frye</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Berkeley Solar
Electric Systems</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>303 Redbud Way</span>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Nevada
City, CA 95959</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>(530) 401-8024</span>
<br>
<a href="http://www.berkeleysolar.com/"><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'>www.berkeleysolar.com</span></a><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span> <o:p></o:p></p>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div class=MsoNormal align=center style='text-align:center'>
<hr size=2 width="100%" align=center>
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<p class=MsoNormal style='margin-bottom:12.0pt'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Jeff
Clearwater, Village Power Design<br>
<b>Sent:</b> Wednesday, July 08, 2009 3:35 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> [RE-wrenches] Efficiency Curves of Fronius Inverters?</span><o:p></o:p></p>
<div>
<p class=MsoNormal>Hey Folks,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>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).<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>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.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Best,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Jeff<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>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.<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>All of these suggestions should be run by a Structural
Engineer before embarking, thus the 1st choice of working with a manu.<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><br>
<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>Good luck!<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal>-jeff o<br>
<br>
>From the Solar, Wind and Hydro powered office of Jeff Oldham/Regenerative
SOLutions<o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><span style='font-size:10.0pt'><br>
<br>
____________________________________________________________<br>
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your home before it is too late. Click here for homeowner insurance
information.</a><o:p></o:p></p>
</blockquote>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><br>
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<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<pre>-- <o:p></o:p></pre>
<div>
<p class=MsoNormal>~~~~~~~~~~~~~<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>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<o:p></o:p></p>
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