Path-Q Solar

What should I do if the utility meter and solar monitoring show different energy totals?

Answer

First identify what each device measures and the comparison period. Solar monitoring may show inverter production, while the utility meter may show net import, net export, or a different interval and boundary. Reconcile production, consumption, battery flows, export limits, outages, and meter readings before concluding that either device is wrong.

Key points

  • Record the meter register, monitoring total, timestamps, units, and time zone for the same interval.
  • Determine whether monitoring is AC or DC, gross generation or net export, and whether battery energy is included.
  • Account for on-site consumption, standby loads, clipping, curtailment, and data gaps.
  • Escalate persistent unexplained differences with both the solar provider and the utility or metering contact.

What it depends on

  • Metering boundary and register definitions
  • System and battery architecture
  • Data intervals, timestamps, and communications
  • Utility meter configuration and export arrangement

Risks and trade-offs

  • A correct difference can appear to be an error when gross production is compared with net export.
  • Estimated or delayed meter data can distort short-period comparisons.
  • Changing settings or wiring without diagnosis can create safety or billing problems.

Information you may need

  • Meter type, register labels, and interval data
  • Monitoring exports and system configuration
  • Battery, load, and export-limit information
  • The exact dates and magnitude of the discrepancy

Your next step

What to do next

Create a same-period reconciliation showing gross production, on-site use, battery flows, imports, and exports, then ask the provider or utility to investigate any remaining unexplained difference.

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