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<div id="signature">My metrology experience is he needs to prove it with a second meter. In a lab setting, at least 2 of 3 calibrated meters need to agree.</div>
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<div>I would also ask Fluke. They have been really good over the years. Good Luck.<br />
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<pre><strong><span style="font-size: small;">Dave Angelini Offgrid Solar
"we go where powerlines don't"
<a href="http://members.sti.net/offgridsolar/" target="_blank" rel="noopener">http://members.sti.net/offgridsolar/</a>
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text 209 813 0060</span></strong></pre>
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<p id="reply-intro">On 2023-04-27 2:10 pm, August Goers via RE-wrenches wrote:</p>
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<div dir="ltr">Hi Wrenches,
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<div>We have a residential site with grid tied solar where there is an electrician involved who has gotten into taking site readings and thinks there is a power factor problem. My gut on it is that there is some sort of measurement reading error, and that the power factor should be around 1. </div>
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<div>The electrician is using a Fluke 3540FC power monitor and has provided a spreadsheet comparing active power to apparent power and calculating power factor. See below (you might have to open the image and zoom in to read it). This measurement was taken with a PV system running, presumably sending some power back to the grid. Note that the phase B active power measurement is negative (PV exporting to grid) and that the apparent power is positive. This nets in a power factor that is crazy low of 0.05.</div>
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<div>Does anyone have experience about whether a meter like this can properly measure these readings - maybe there is a setting error or it can't deal with negative readings?</div>
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<div><img src="cid:1682637178644b017a09edc592716977@sti.net" alt="image.png" width="542" height="45" /></div>
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<div>Best,</div>
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<div>August</div>
<div>Luminalt</div>
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