Inconsistent Load and Solar Readings​​​​​​​​​​​​​​

On the landing page, the site import increases as solar production increases, rather than decreasing as expected

Symptoms

On the landing page, the site import increases as solar production increases, rather than decreasing.

Steps to Troubleshoot

  1. Ensure all solar is metered exactly once.
  2. If configuring Solar CTs as Solar (1CTx2) in Setup App, ensure that only one CT is used for each inverter, measuring a single phase.
  3. Confirm the CT is facing the correct way (if the solar value is negative, Powerwall will not charge because the system expects to see a solar value greater than zero and a site value less than zero):
    1. Locate the CT(s) used to measure the source that is displaying incorrect power flow readings.
    2. Verify the CT(s) are oriented such that the label is facing toward the source (away from the breaker).
      1. Solar Current Transformer: Label toward the Inverter
      2. Site Current Transformer: Label toward the Grid
      Figure 1. Tesla 100 A Current Transformer Orientation in Relation to Power Flow
      Figure 2. Neurio W2 CT Correctly Oriented to Measure Solar (top) and Incorrectly Oriented (bottom)
  4. Confirm the CT is measuring the correct phase (if the solar value is positive and the site value is also positive, the CT(s) may be on the wrong phase):
    1. Locate the CT on the Meter page in Tesla One.
    2. Determine which phase the CT should be measuring.
      Informational PurposesAn informational icon, calling your attention
      Note
      If using Gateway CTs, the ports are CT 1 (Line 1), CT2, (Line 2), CT 3 (defaults to Line 1 but can be configured as Line 2 in Tesla One).
      Informational PurposesAn informational icon, calling your attention
      Note
      If using a Neurio meter, the ports are A (Line 1), B (Line 2), B (Line 2), A (Line 1) and are determined by voltage reference.
    3. Verify the CT is measuring the correct phase.
      Figure 3. Gateway CT Measuring Correct Phase (top) and Incorrect Phase (bottom)
      Figure 4. Neurio W2 CT Measuring Correct Phase (top) and Incorrect Phase (bottom)
      Informational PurposesAn informational icon, calling your attention
      Note
      In the examples above, the CT is monitoring a solar inverter conductor, which is why only (1) CT is required.
  5. Inconsistent load readings can be caused by a Neurio meter intermittently dropping out. See Neurio Meter Failed to Add / Not Connecting to troubleshoot Neurio meter connection issues/