Variance between sensors on mains vs utility meter

Emporia Energy Community Share Your Emporia Experience Variance between sensors on mains vs utility meter

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    • #8170 Report Abuse
      OBSSD
      Member

      As a bit of a data nerd, I’ve really enjoyed having the 16-sensor Emporia Vue 2 hooked up and have added 8 Emporia plugs to gain additional insights.  Installation was straight-forward but a bit of a headache, dealing with the bulky CT clamps and big mass of wires.  I have no solar (yet) and probably won’t use the Vue 2 to measure production, but rather focus on my raw consumption.   I’ve documented a number of suggestions in the following threads:

      App suggestions

      Hardware suggestions

      Now that I’ve completed my first full billing cycle, I exported the raw Emporia data to compare with my utility’s meter readings and was a bit surprised at the difference between the two.  Summing up usage of both mains from the 1DAY log, over the same date range as my meter readings, the Emporia was 7% lower than the utility (98kWh less).  Has anyone else seen similar results?

      I’ve checked the hourly log and its totals match the daily totals so it doesn’t look like any summation issues on the Emporia side.  I’m going to try reading the meter myself at the same time of day on a weekly basis and compare my readings with the hourly Emporia logs for a while to see if it’s consistently lower.

    • #8237 Report Abuse
      OBSSD
      Member

      With an additional 3 weeks of measurements, I’m continuing to see a 7% lower reading from the mains on my Vue 2 than from the utility meter.

      • #8436 Report Abuse
        LAM69
        Member

        100% agree, I have been keeping an eye on the Solar generated on the roof and how much extra I am bringing in, and have found since installing the monitor it measures approximately 7.6% less on average than the Utility meter here in the UK, so it’s more indicative of use which is still useful but not 100% accurate.

    • #8440 Report Abuse
      Peter
      Member

      If you want to get up close and personal with the board, you can download, and edit, and replace the factory calibrations.

      https://flaviutamas.com/2021/reversing-emporia-vue-2

    • #8533 Report Abuse
      dawdawdo
      Member

      This is exactly what I came here to post about and it happened to be the first topic, : )

      I see a similar difference (electric company observes higher usage than the board), however, I get around a 1.5% difference over a six month period and it’s not really consistent – it has varied between +2.2% to -1.4%. Without a meaningfully similar point of reference, it feels like about the right level of noise to expect, but I’m curious to hear thoughts from others.

      Thanks!

    • #8534 Report Abuse
      OBSSD
      Member

      I stopped reading the meter myself (which gave accuracy down to the hour) and started going off my utility bill so I’m definitely seeing more variability month-to-month but I’m still averaging 7.1% lower on my Vue2 mains over the past 6 months.

    • #8608 Report Abuse
      OBSSD
      Member

      I finally got around to reaching out to Emporia support (awesome service, BTW!!!) – it was a simple matter of replacing my main CT sensors.  I’m now tracking well within the 2% advertised accuracy (usually around 0.5%).

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