Negative Site Reading
On the landing page, the site value is negative. An alert will appear on the landing page
Steps to Troubleshoot
- Confirm the CTs are facing
the correct way:
- Locate the CT(s) used to measure the source that is displaying incorrect power flow readings.
- Verify the CT(s) are oriented such
that the label is facing toward the source (away from the breaker).
- Solar Current Transformer: Label toward the Inverter
- 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)
- Confirm the CTs are measuring
the correct phase:
- Locate the CT on the Meter page in Tesla One.
- Determine which phase the CT should
be measuring.
- Verify the CT is measuring the
correct phase.
Figure 3. Gateway CT Measuring Correct Phase (top) and Incorrect Phase (bottom) NoteIn the examples above, the CT is monitoring a solar inverter conductor, which is why only (1) CT is required.Figure 4. Neurio W2 CT Measuring Correct Phase (top) and Incorrect Phase (bottom) NoteIn the examples above, the CT is monitoring a solar inverter conductor, which is why only (1) CT is required.
Note
The site value can be negative
if power is flowing to the grid.