Re: [RE-wrenches] active vs apparent power readings with solar

[Jay via RE-wrenches]

Certainly could be the meter or how it’s being used. Like is the Electrican checking the main or output from the inverter? If the inverter output shows these numbers I’d check to make sure the inverter is in the correct grid connection  setting.  Jay On Apr 27, 2023, at 5:13 PM, Dave Angelini Offgrid Solar via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:  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.   I would also ask Fluke. They have been really good over the years. Good Luck.   Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ e-mail offgridso...@sti.net text 209 813 0060 On 2023-04-27 2:10 pm, August Goers via RE-wrenches wrote: Hi Wrenches,   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.    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.   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?   <image.png>   Best,   August Luminalt _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org

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