Path-Q Solar

What should I check first if my solar monitoring data do not reconcile with the utility bill's import and export readings?

Answer

First confirm that the monitoring period, meter period, units, and measurement points match. Solar monitoring commonly reports system generation, while the utility bill may report electricity imported from and exported to the grid; these are different quantities and may use different intervals or meter locations.

Key points

  • Compare the same dates and account or meter, including billing-cycle start and end dates.
  • Identify whether monitoring shows total production, net production, consumption, or only inverter output.
  • Check for batteries, multiple meters, estimated utility readings, missing data, time-zone differences, and known monitoring outages.

What it depends on

  • Monitoring platform measurements and configuration
  • Utility meter definitions and billing period
  • Presence of batteries, multiple meters, or loads not measured by the monitoring system

Risks and trade-offs

  • A mismatch does not by itself prove system underproduction or utility metering error.
  • Using nonmatching periods can create large apparent discrepancies.
  • Persistent unexplained differences may indicate a communications, sensor, wiring, or metering problem.

Information you may need

  • Monitoring graphs or exports for the exact billing period
  • Utility bill details showing import, export, and meter readings
  • System diagram, battery information, and any monitoring or meter alerts

Your next step

What to do next

Create a same-period comparison of the defined quantities, then ask the installer or utility to investigate only after confirming the measurement points and dates match.

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