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  • trouble with enphase envoy consumption measurements

    So I'm having a hell of a time with my enphase envoy consumption measurements. Specifically it has to do with the power factor. I've got the old (non-IQ) version of the envoy. My consumption only power-factor when I look at it from the installer toolkit says around 1.0, but the apparent power is nearly double the watt measurement which implies a pf of around 0.5. When I investigate the raw numbers from interrogating the envoy direcly it actually shows me the low power factor. There's simply no way I have a power factor of 0.52 in the house. I've tried switching polarity on the CTs, and moving them around, but I can't get it into a real range. I'm wondering if someone with a functioning pre-IQ envoy could browse the production json value and post your results. Here's what mine looks like:

    (browse to <envoyIP>/production.json )
    {"production":[{"type":"inverters","activeCount":28,"readingTime" :0,"wNow":0,"whLifetime":9589866},{"type":"eim","a ctiveCount":1,"measurementType":"production","read ingTime":1515265400,"wNow":7154.83,"whLifetime":95 25811.46,"varhLeadLifetime":0.758,"varhLagLifetime ":2289138.248,"vahLifetime":10862358.873,"rmsCurre nt":58.14,"rmsVoltage":246.755,"reactPwr":554.943, "apprntPwr":7173.184,"pwrFactor":1.0,"whToday":183 92.46,"whLastSevenDays":268409.46,"vahToday":22074 .873,"varhLeadToday":0.758,"varhLagToday":5557.248 }],"consumption":[{"type":"eim","activeCount":1,"measurementType":"t otal-consumption","readingTime":1515265400,"wNow":776.6 79,"whLifetime":15434171.915,"varhLeadLifetime":23 44467.716,"varhLagLifetime":4136758.513,"vahLifeti me":16751447.778,"rmsCurrent":6.044,"rmsVoltage":2 46.715,"reactPwr":-1320.282,"apprntPwr":1491.224,"pwrFactor":0.52,"wh Today":12124.915,"whLastSevenDays":231071.915,"vah Today":23827.778,"varhLeadToday":7532.716,"varhLag Today":5666.513},{"type":"eim","activeCount":1,"me asurementType":"net-consumption","readingTime":1515265400,"wNow":-6378.151,"whLifetime":10563500.647,"varhLeadLifeti me":2344466.957,"varhLagLifetime":1847620.266,"vah Lifetime":16751447.778,"rmsCurrent":52.096,"rmsVol tage":246.676,"reactPwr":-765.34,"apprntPwr":6423.981,"pwrFactor":-0.99,"whToday":0,"whLastSevenDays":0,"vahToday":0, "varhLeadToday":0,"varhLagToday":0}],"storage":[{"type":"acb","activeCount":0,"readingTime":0,"wNo w":0,"whNow":0,"state":"idle"}]}

  • #2

    Edit... I'm pretty sure something is miswired. Like, not only are the phases mixed up on the consumption CT's, but they are facing backwards or have the leads reversed, too.
    Last edited by sensij; 01-06-2018, 03:34 PM.
    CS6P-260P/SE3000 - http://tiny.cc/ed5ozx

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    • #3
      I think the negative power factor happens when you're sending power back to the grid, but I could be wrong. Anyway, I tried reversing both the production CTs and swapping their phases. Here's what I get now:

      {"production":[{"type":"inverters","activeCount":28,"readingTime" :1515273265,"wNow":171,"whLifetime":9601464},{"typ e":"eim","activeCount":1,"measurementType":"produc tion","readingTime":1515273272,"wNow":2550.319,"wh Lifetime":9536358.584,"varhLeadLifetime":0.758,"va rhLagLifetime":2290273.033,"vahLifetime":10872994. 47,"rmsCurrent":21.212,"rmsVoltage":245.304,"react Pwr":498.904,"apprntPwr":2602.068,"pwrFactor":0.98 ,"whToday":28939.584,"whLastSevenDays":264992.584, "vahToday":32710.47,"varhLeadToday":0.758,"varhLag Today":6692.033}],"consumption":[{"type":"eim","activeCount":1,"measurementType":"t otal-consumption","readingTime":1515273272,"wNow":689.6 36,"whLifetime":15437803.168,"varhLeadLifetime":23 45897.04,"varhLagLifetime":4137920.844,"vahLifetim e":16759706.691,"rmsCurrent":4.634,"rmsVoltage":24 5.313,"reactPwr":-1236.266,"apprntPwr":1136.884,"pwrFactor":0.61,"wh Today":15756.168,"whLastSevenDays":232558.168,"vah Today":32086.691,"varhLeadToday":8962.04,"varhLagT oday":6828.844},{"type":"eim","activeCount":1,"mea surementType":"net-consumption","readingTime":1515273272,"wNow":-1860.683,"whLifetime":10563982.827,"varhLeadLifeti me":2345896.281,"varhLagLifetime":1847647.811,"vah Lifetime":16759706.691,"rmsCurrent":16.578,"rmsVol tage":245.322,"reactPwr":-737.361,"apprntPwr":2035.162,"pwrFactor":-0.91,"whToday":0,"whLastSevenDays":0,"vahToday":0, "varhLeadToday":0,"varhLagToday":0}],"storage":[{"type":"acb","activeCount":0,"readingTime":0,"wNo w":0,"whNow":0,"state":"idle"}]}

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      • #4
        You may have current leading or trailing the voltage for poor Power Factor. The PF of the
        inverter feeding the grid should be close to a perfect 1, loads could cause out of phase currents.
        If your voltage reference connection has a problem, a false PF reading could result.
        Bruce Roe

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        • #5
          I don't really understand how the system is configured. The output suggests there are four data sources... production from the inverters, and then a type "eim" reporting production, a type "eim" reporting "total consumption", and a type "eim" reporting "net consumption".

          On what circuits are the CT's actually located? On most systems, "total consumption' can only be derived from the production circuit and net consumption at the connection to the grid, not measured directly.
          CS6P-260P/SE3000 - http://tiny.cc/ed5ozx

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          • #6
            So I thought I'd update people on what I found just in case someone else runs into this problem.

            first, to sensij, the readings here under production are made with an actual CT off the panels. The readings under NET are made with a pair of CTs on the full house wiring (includes production and consumption). The readings under "TOTAL CONSUMPTION" are derived from the other two sets of readings.

            Here's what I've found: the values for amperage, VA, wattage and PF on production are correct. The values for amperage, VA, wattage and PF on NET are correct. The values for wattage and amperage on "TOTAL CONSUMPTION" are correct. The values for VA and PF on "TOTAL CONSUMPTION" are not correct. Enphase seems to have a bug where they sum the amperage values for each phase and then multiply that by 240 to get VA. That's wrong and results in a VA value for TOTAL CONSUMPTION that's upwards of twice what it should be. That obviously throws the derived power factor way off, which is what drove me to look into this in the first place. It's surprising that such a bug still exists with a product that's as well established as this, but the VA isn't really used for anything and isn't actually displayed anywhere but in the installer toolkit, so maybe it shouldn't surprise me.

            Long story short, I've got things wired correctly, but Enphase isn't calculating VA correctly in the Total Consumption category.

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            • #7
              Originally posted by rszimm View Post

              Long story short, I've got things wired correctly, but Enphase isn't calculating VA correctly in the Total Consumption category.
              Thanks for the detailed update!
              CS6P-260P/SE3000 - http://tiny.cc/ed5ozx

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