System availability

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.

• Energy sum at system level defined as the term E_Z_EVU

• Irradiance data from a sensor defined as the term G_M0 or satellite data

• Default threshold value greater than 100W/m²

Standard formula and calculation

• Within the measurement interval, the entire plant is either available (100%) or not available (0%). If the energy is not equal to 0 within an interval, the availability is 100%.

• System availability is only calculated during intervals where irradiance is greater than 100 W/m².

• Intervals in which energy data is missing are treated as if the system is available.

• The system availability calculation is not available for the current day.

Note

If you wish to define the input parameters differently, see KPI editor for PR and system availability.

I1

90

10

Not rated

I2

125

20

100%

I3

200

30

100%

I4

80

0

Not rated

I5

250

0

0%

I6

200

NULL*

100%

I7

150

30

100%

I8

130

20

100%

I9

110

0

0%

System availability

5/(5+2) = 71.4%

*NULL means no data available for this interval