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Greenbyte Documentation

Time-Based System Availability (Inverter)

Availability is the extent (in %) to which an inverter is performing its intended services within its design specification. System availability is the overall availability of the device, not taking into account any contracts.

It is calculated for every timestamp. It is considered available when the inverter’s reference irradiance is above the cut-in threshold and it has Power with a fallback greater than 0.

Technology

Solar

Remarks
  • The irradiance cut-in threshold is different if time-based system availability is used to calculate performance. Normally, it is the Availability irradiance cut-in metadata but for performance, the Performance irradiance cut-in metadata is used.

  • Without Irradiance data or Power with fallback data, availability can not be calculated.

Required metadata fields:

  • Availability Irradiance Cut-In (W/m2) (Inverter metadata 8)

  • Performance Irradiance Cut-In (W/m2) (Inverter metadata 13)

Equation
Time-based_System_Availability__Inverter__-_Equation.png

Where:

ATS

is Time-based System Availability

I

is Solar Irradiance Reference

P

is the Energy or Power with Fallback

Cut-inP

is a Cut-in to filter out very low power values, which means unavailable, a constant set to 0.0001.

Cut-in IA

is the Availability Irradiance Cut-In (W/m2) (Inverter metadata 8)

Cut-inIP

is the Performance Irradiance Cut-In (W/m2) (Inverter metadata 13)

Inputs
Time-based_System_Availability__Inverter__-_Inputs.png
Usage Example

On its own, this calculation can be used to find out how available your inverter is and if it has any periods of unavailability, for instance through Data studio.

Time-based_System_Availability__Inverter__-_Usage_Example.png

This calculation is also further used in other calculations, for example, different lost productions.