Greenbyte Documentation

Performance Index (Availability Corrected)

Performance Index (Availability Corrected) is a metric of an inverter's true performance. It compares actual power to potential power for timestamps when the inverter is online, so it is calculated when the inverter is producing. The Performance Index (avail. corr) can be used to find inverters that under-perform during normal operation. It is only calculated when system availability is more than 0%.

Technology

Solar: Inverter

Equation
performance-index-avail-corr-eq.jpg

where:

PIAC

is Performance Index Availability Corrected

Etheoretical

e-theoretical-eq.jpg

Eactual

e-actual-eq.jpg

E

is Energy Export (Eexport) from the inverter with a fallback to the inverter’s Power AC (P):

e-eq.jpg

Pcasc

is Cascading Potential Power for performance

Iref

is Solar Irradiance Reference

Cut-inIP

is the performance irradiance cut-in (W/m2) for the inverter

ATS

is Time-based System Availabilityfor the inverter

T

is the device resolution in hours

Inputs
performance-index-avail-corr-in.jpg
Example
performance-index-avail-corr-ex.png