Enter the actual ready of the plant output and the calculated nominal plant output into the calculator to determine the PV performance ratio.
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PV Performance Ratio Formula
The following equation is used to calculate the PV Performance Ratio.
PR = AO / NO
- Where PR is the performance ratio
- AO is the actual reading of the plant output (kWh)
- NO is the nominal calculated plant output (kWh)
To calculate the PV performance ratio, simply divide the actual output by the nominal calculated output.
What is a PV Performance Ratio?
A PV performance ratio measures the difference between the amount of power generated by a solar energy system and the amount of power expected from the system. This number is expressed as a percentage.
For example, if a solar energy system generates 10 percent more power than expected, then it has a performance ratio of 110 percent. A solar energy system with a performance ratio below 100 percent means that it isn’t performing as well as expected.
A PV performance ratio is independent of location. That means it only measured the performance relative to the expected performance in that area, not relative to areas with more sunlight.