What is the Performance Ratio?
The Performance Ratio (PR) is a percentage (%) indicator that measures the production capacity of a photovoltaic system in relation to its theoretically optimal potential under the meteorological conditions that occurred over a given period.
It is calculated over a specific time interval, which can be one day, one month, or one year, for example.
PR is the most widely used performance indicator in the photovoltaic industry.
What is the Performance Ratio used for?
The Performance Ratio is used to evaluate the performance level of a photovoltaic installation. In other words, it serves as an indicator of whether a solar PV system is operating correctly or not. It is applied in the following areas:
Fault detection – Helps identify low-performance issues, allowing an analysis of the causes and the implementation of corrective measures. Common failures include dirty panels, inverter malfunctions, or design errors.
System optimization – Aims to monitor the plant's operation to improve performance and increase production through new actions.
How is the Performance Ratio calculated?
The PR is calculated by dividing the actual generated energy by the theoretical energy that could have been produced, then multiplying the result by 100 to express it as a percentage.
To obtain irradiance on the inclined plane (Hpoa)
To measure irradiance on the inclined plane (Hpoa), it is necessary to use a solar irradiation measurement device, such as a pyranometer or a solar measurement cell. However, if these devices are not available, it is also possible to obtain estimated data from meteorological agencies or specialized providers that process irradiance data using satellites or other methodologies.
Conclusions:
The Performance Ratio is a key indicator for optimizing the efficiency of photovoltaic systems. Therefore, it is also crucial for achieving high economic profitability from solar installations.
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