KPI Editor: System availability

Last modified: 2026-09-22

System availability is the percentage of a system that is available over a period of time. It is an indicator of how quickly faults are identified and remedied.

System availability overview

	Name	Description
1	New availability calculation	Create a new system availability formula.
2	Main availability	Main system availability used in charts and reports.
3	View	The formula is read-only if the user is not the creator.
4	Edit	Edit calculation parameters.
5	Export calculation	Export calculation parameters and data for a specific date as an Excel spreadsheet
6	Delete	Delete system availability formula.

Default system availability formula

Expand to view formula

The following availability formula is used by default:

System availability parameters

You can adjust the following parameters to your needs in the formula.

These settings affect the Availability chart in the Section: System KPIs and the Availability chart in the Section: Inverters.

Expand to view explanation of system availability parameters

	Parameter	Variable	Description
1	Calculation method	P_i,n & P_instn (inverter level)	System level: Monitor the energy of the entire system. Inverter level: Tracks the power of every inverter. The individual values are then used to create an overall value.
2	Irradiance threshold	Irr_threshold	Set the minimum irradiance value required for system operation.
3	Source of irradiance data		Select whether your irradiance data comes from a Sensor or Satellite.
4	Excluded ticket causes		Choose intervals you want to exclude from the calculation. See Exclude tickets from KPI calculations.
5	Weighting by irradiance		Give more weight to intervals with higher irradiance levels. Instead of a simple time-averaged availability, the availability of each time interval is multiplied by the irradiance level during that period before averaging. With this option, the weighted values are displayed in the charts. It is also possible to recalculate the values for historical data under Terms. Weighting by irradiance is useful for comparing systems across different climatic conditions or identifying downtime issues that primarily affect high-production periods.

Configure a new system availability

Prerequisites

You are a premium partner or have purchased the KPI Editor module.

User group operations or higher

Steps

Go to System settings > Calculations > System availability.
Select New availability calculation.
Select Edit next to New availability calculation and give your calculation a name.
Edit the parameters to meet your requirements. See System availability parameters.
Select Save.

The system availability is configured. The formula on the right side of the window will update based on the new settings.

Example: User-defined system availability configuration

The user-defined system availability in the screenshot below is based on the contractual requirements of a specific system.

(1) Calculation method: System level. Calculated for the entire system, meaning the main system availability formula used.

(2) Irradiance threshold: 50 W/m².

(3) Source of irradiance data: Satellite data. The interval related to the ticket “Inverter” is excluded from the calculation.

(4) Excluded ticket causes: Tickets with the Inverter ticket cause are excluded from the calculation.

(5) Weighting by irradiance: More weight is applied to intervals with higher irradiance levels.

Example_User-defined system availability configuration — Example: User-defined system availability configuration

Troubleshooting: KPI not available

Missing KPIs are usually caused by missing data, outages, or low irradiance. Check your data sources and alarms.

To help identify root causes, you can Download a CSV file to view the raw data used for the PR calculation (daily aggregation). The same root causes will affect system availability as well.