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Greenbyte Documentation

Potential Power Module Temperature

This signal calculates the potential power in the same way as irradiance, only with the addition of including temperature. The warmer the panel is, the less effective it will be (according to the temperature coefficient constant). Degradation and irradiance cut-in are accounted for through the Potential Power Irradiance Only signal.

Technology

Solar

Remarks

The reference pyranometers used for calculating the temperature average (Tavg), will be all pyranometers configured as references for this inverter. If no reference pyranometers are configured, all other pyranometers in the same site will be used instead.

The temperature used for every timestep will be an average of the available temperature signals.

Note

  • If the Cell Reference Temperature (°C) metadata is missing, a default of 25 C° will be used.

  • If the Power Temperature Coefficient (%/°C) metadata is missing, a default of -0.3% will be used.

Equation
Potential_Power_Module_Temperature_-_Equation.png

Where:

Pp+

is the Potential power module temp., clamped to the positive part.

Pi

is the Potential Power Irradiance Only.

K

is the Power Temperature Coefficient (%/°C) (Site metadata 27).

Tavg

is the average of available temperature signals.

Tref

is the Cell Reference Temperature (°C) (Inverter metadata 35).

Inputs
Potential_Power_Module_Temperature_-_Inputs.png
Usage Example

In this example, you can see how the temperature of the module is affecting the Potential power calculation. With higher module temperature, the Potential power is lower than Potential power Irradiance only.

Potential_Power_Module_Temperature_-_Usage_Example.png