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Active Power sign conventions

Rule

If energy enters the system, its sign is positive. If energy leaves the system, its sign is negative.

Conventions

  • Load:
  • Consumption -> Negative
  • Storage:
  • Charging -> Consumption -> Negative
    • Discharging -> Production -> Positive
  • Generation:
  • Production -> Positive
  • Grid:
    • Feeding In -> Consumption -> Negative
    • Drawing From -> Production -> Positive

Visualization

Power Sign Conventions

Goal

We want to make sure that all data that reaches the database (InfluxDB) has the correct sign. The goal is to only use the invert functionality of OpenEMS if a meter or system is connected the other way around, without the ability to change this.