• After a multimeter outage, the respected power values will be missing for this specific time period. In the processes of calculating the energy by integrating the respective power, IEC 61724 proposes to fill in missing values using previous available values. Insolar follows this approach, but when the missing values span a large time period the interpolation gives erroneous results for the power and subsequently for the energy.
  • It is true that if the cumulative energy was used to calculate the daily energy, it may work more properly in some cases. However, this would not be the case when the outage supersedes the day boundary, since there is no way to know which part of the recorded cumulative energy corresponds to each timestamp, so an error may anyhow occur.
  • For that reason, the IEC 61724 proposes to calculate the daily energy through an integration of the power and not through the cumulative energy.