<div dir="ltr">Hi All - Yea, I'm suspecting some sort of reading / measurement error. The system has SunPower AC modules with Enphase IQ7 microinverters and I believe the electrician measured the readings down by the utility meter, although I'm not certain. You can see from the bottom of the datasheet that the power factor setting is 1.0 or adjustable between 0.85 inductive or capacitive. <div><br></div><div><img src="cid:ii_lh0zufpy2" alt="image.png" width="506" height="200"><br><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><p><b><span style="font-size:9pt;font-family:"Century Gothic",sans-serif">August Goers</span></b></p><p><br></p>
<p> </p></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Apr 28, 2023 at 12:20 PM Christopher Warfel via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p><font size="4">I think the power factor will be very close to one
for split phase. What's the inverter specs say w/r to this?
Chris</font><br>
</p>
<div>On 4/27/2023 5:10 PM, August Goers via
RE-wrenches wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hi Wrenches,
<div><br>
</div>
<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>
<div><br>
</div>
<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>
<div><br>
</div>
<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>
<div><br>
</div>
<div><img src="cid:187c980f243cb971f161" alt="image.png" width="542" height="45"><br>
</div>
<div><br>
</div>
<div>Best,</div>
<div><br>
</div>
<div>August</div>
<div>Luminalt</div>
</div>
<br>
<fieldset></fieldset>
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<font face="PMingLiU-ExtB">
Christopher Warfel</font><br>
<font face="PMingLiU-ExtB"> ENTECH
Engineering, Inc.</font><br>
<font face="PMingLiU-ExtB">PO Box 871, Block Island, RI
02807</font><br>
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