Master/sub-meter variance and loss

Explain the difference between master and sub-meters

Variance is not always line loss. SystemPro separates measurements, totals, residuals, missing data, and unclassified usage for operational review.

For parks with master meters, building sub-meters, tenant meters, and common-area usage that require continuous energy-balance checks.

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One loss percentage cannot explain where the difference comes from

Meter relations drift

Without effective periods, current relations can incorrectly reinterpret historical months.

Missing data pollutes variance

Treating absent sub-meter data as zero makes missing usage look like loss.

Unclassified usage is ignored

Common areas, spare circuits, and unbound meters can create real variance.

Validate relations before explaining variance

Confirm the period and effective meter relations before comparing master measurements, sub-meter totals, unclassified usage, and unexplained residuals.

Master measurement
Sub-meter total
Common & unclassified
Data quality
Variance conclusion

Make loss analysis reproducible

Master/sub relations

Manage master meters, sub-meters, service coverage, and effective periods.

Energy balance

Compare master, sub-meter, common-area, and unclassified usage in the same period.

Quality validation

Identify missing readings, rollbacks, anomalies, and incomplete relations.

Variance explanation

Separate explainable loss, unclassified usage, and residuals that need review.

Not every difference is labelled as line loss

Master and sub-meters share the same period, units, and effective relation range.
Missing data does not silently enter reconciliation as zero.
Every aggregate can drill down to meters and time intervals.

Analysis boundary

The system provides variance breakdown and review evidence. Final attribution among technical loss, operational loss, and meter error still requires field circuits, assets, and maintenance records.