<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Seaward changed/updated their algorithm/programming-not sure when but it hasn\u2019t been too long ago. May be worth contacting them again to see if your unit could benefit from the upgrade (I think you have to send it in). <br><br><div id="AppleMailSignature" dir="ltr">Brian</div><div dir="ltr"><br>On Sep 24, 2018, at 12:18 PM, Dave Tedeyan <<a href="mailto:dtedeyan@taitem.com">dtedeyan@taitem.com</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><div dir="ltr">Does anyone here have a good understanding of the Seaward PV210 curve tracer? I recently went to commission a commercial site where nearly all of my 90 traces did not come out looking right. It looks like the tracer is just not taking enough data points to come up with a good trace. It also was not consistent.<div><br></div><div>In the attached file, the two strings that have a Voc of about 800V were actually the same string. It seemed random that the tracer would take more or less points, and then come out with wildly different fill factors.</div><div><br></div><div>The only times that it seemed to take more data points to come out with a (relatively) good curve was when the irradiance was changing during the trace. That is the third trace on the graph of a different string with Voc of about 435V.</div><div><br></div><div>I have not used this a ton, but in the past I have gotten good traces out of it. When I had seen this in the past, I contacted Seaward, and they gave me a free calibration, even though it had been well under a year since I owned it. But they did not address the issue I am seeing here.</div><div><br></div><div>So does anyone know why I might not be getting a good curve, and if there is anything that can be done about it?</div><div><br></div><div>Thanks,</div><div>Dave<br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><br></div><div><b><font face="tahoma, sans-serif">Dave Tedeyan</font></b></div><div><font face="tahoma, sans-serif">Senior Engineer | Taitem Engineering, PC</font></div><div><font face="tahoma, sans-serif"><img src="https://www.taitem.com/signatures/logo.png"><br></font></div><div><font face="tahoma, sans-serif">10 Verizon Lane | Lansing, NY 14882</font></div><div><font face="tahoma, sans-serif">o. <u>607.930.3481</u> x6 f. 607.277.2119</font></div><div><font face="tahoma, sans-serif"><a href="http://www.taitem.com" target="_blank">www.taitem.com</a></font></div><div><br></div><div><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Solar </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">\u2022</span><span style="font-family:tahoma,sans-serif;font-size:12.5pt;line-height:17.8333px"> </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Sustainability </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">\u2022 </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Energy </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">\u2022 </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Design</span><br></div><div><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px"><span style="font-size:13.3333px">B-Corporation Best for the World 2018 Honoree</span></span></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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