System Monitoring

System monitoring provides information on the monitoring status of your system. Various monitoring options are available, which you can set and enable. If desired, the PV system monitoring can send you an alert via e-mail. The following functions can be enabled and set in system monitoring:

Function	Explanation
Inverter comparison	With the inverter comparison function, possible yield losses can be identified. If the specific yield of an inverter deviates from the set tolerance to the mean value of the specific yields of the other inverters, you can be informed by e-mail. Inverter comparison will only be displayed if there is more than one inverter in your system. An alarm is triggered if the specific yield of the entire system exceeds 0.05 kWh/kWp.
Performance ratio	The performance ratio (PR) is a measure of the quality of a PV system that is independent of location and is therefore often referred to as quality factor. The performance ratio is the ratio between the actual yield and the target yield of the system. Hence, it indicates the proportion of generated energy that is actually available for feed-in after deduction of energy losses (e.g. due to thermal and conduction losses ) and of the requisite operating current. With the performance ratio, you can check the quality of your system. The closer the PR value determined for a system is to 1, the more efficiently the respective system is operating. The performance ratio is calculated by means of the following formula: * STC = Standard Test Condition 1 kWh/m² * ⍺ = Temperature coefficient of the PV module. Sunny Portal uses the average value -0.4%/°C for the calculation. To calculate the performance ratio, sensors for solar irradiation and module temperature must be configured for all PV modules. A sensor for outside temperature can be integrated in addition.
Expected PV yield	With the expected PV yield, deviations between expected and actual annual yield of the PV system can be shown. The expected annual yield of the PV system is calculated from the specific annual yield at the PV system location and the PV system power.

Function

Explanation

Inverter comparison

With the inverter comparison function, possible yield losses can be identified. If the specific yield of an inverter deviates from the set tolerance to the mean value of the specific yields of the other inverters, you can be informed by e-mail.

Inverter comparison will only be displayed if there is more than one inverter in your system.

An alarm is triggered if the specific yield of the entire system exceeds 0.05 kWh/kWp.

Performance ratio

The performance ratio (PR) is a measure of the quality of a PV system that is independent of location and is therefore often referred to as quality factor. The performance ratio is the ratio between the actual yield and the target yield of the system. Hence, it indicates the proportion of generated energy that is actually available for feed-in after deduction of energy losses (e.g. due to thermal and conduction losses ) and of the requisite operating current.

With the performance ratio, you can check the quality of your system. The closer the PR value determined for a system is to 1, the more efficiently the respective system is operating.

The performance ratio is calculated by means of the following formula:

* STC = Standard Test Condition 1 kWh/m²

* ⍺ = Temperature coefficient of the PV module. Sunny Portal uses the average value -0.4%/°C for the calculation.

To calculate the performance ratio, sensors for solar irradiation and module temperature must be configured for all PV modules. A sensor for outside temperature can be integrated in addition.

Expected PV yield

With the expected PV yield, deviations between expected and actual annual yield of the PV system can be shown. The expected annual yield of the PV system is calculated from the specific annual yield at the PV system location and the PV system power.

System Monitoring

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