Overview
In Bazefield, a Totalizer is a specialized point type that aggregates raw SCADA data over a regular time interval. They are ideal for summarizing telemetry like energy production, average irradiance, or peak voltage. Calculated Points can do the same, but Totalizers run at the Edge, enabling time-based insights without external processing.
Totalizer data is typically stored in the Bazefield IMATIS database or an external database like PostgreSQL—similar to Interval Calculations.
Key Capabilities
ℹ️ Time-Based Aggregation
Totalizers compute values over a defined interval (e.g., 5 minutes, 1 hour).
Example: Sum of power over the last 5 minutes
Example: Maximum voltage in the last 5 minutes
ℹ️ Flexible Aggregation Types
Supported operations include:
SumTime-Weighted AverageMaximumMinimumStandard Deviation
ℹ️ Real-Time KPI Generation
Totalizers are often used to feed dashboards, alarms, and reports with interval-based metrics like:
Average irradiance
Total energy
Peak current
Examples
A Totalizer named KPI-IrradiancePOA is configured as follows:
Point Type:
TOTALIZERAggregation:
TimeAverageInterval:
300 seconds(5 minutes)Source Point (Raw from SCADA):
@IrradiancePOASaveAtIntervalStart:
True(to log the output timestamp at the beginning of the interval)
This setup calculates the average plane-of-array irradiance every 5 minutes — perfect for solar performance KPIs.
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Example 5m average irradiance Totalizer
Totalizer Capability | Example Use Case | Syntax |
|---|---|---|
Aggregate raw SCADA data over an interval of time | Compute average power over the last 5 minutes | TotalizerAggregate=TimeAverage | Interval=300 | SourceTag=@ActivePower |
Compute maximum voltage in the last 5 minutes | TotalizerAggregate=Maximum | Interval=300 | SourceTag=@Voltage |
Why Totalizers Matter
✔️ Simplified Analytics: No need for external tools to compute interval-based metrics.
✔️ Operational Insight: Capture trends like peak loads or average conditions over time.
✔️ Automation Ready: Feed alarms, reports, and dashboards with clean, interval-based data.
✔️ Flexible & Scalable: Apply to any raw point at the Edge, off-loading calculation resources from the central Bazefield servers.
Totalizer Aggregates
Full list of available totalizer aggregates:
COUNT
SUM
TOTAL
TIMEAVERAGE
INTERPOLATIVE_START
INTERPOLATIVE_END
AVERAGE
DELTA
MAXIMUM
MINIMUM
VARIANCE
STDEV
ANGAVERAGE
ANGTIMEAVERAGE