Lower Temperature Coefficient

What is Temperature Coefficient in Solar Panels?

The temperature coefficient of a solar panel is the percentage of power output lost per degree Celsius of temperature increase. The higher the temperature coefficient, the greater the power loss at high temperatures. The temperature coefficient is an important factor to consider when selecting a solar panel, as it will affect the panel’s power output in hot weather. What causes this to happen is that when temperature increases it increases the energy of the bound electrons disrupting the exciting state for the solar cells that results in a reduction of power in the solar panel output. However, the Temperature Coefficient in Solar Panels differs from one type to another. To understand more about the temperature coefficient, it is measured in percentage per degree Celsius so if a random solar panel has a temperature coefficient of 0.4%/ °C then if the surrounding temperature is 30 which is five degrees higher than the STC temperature we are talking of around 2% power decrease if it applied on a 10KW solar panel array the lost in power will be around 200W which is a noticeable decrease for solar power plants.

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What is the temperature coefficient of different types of solar panels?


  • Polycrystalline cells: Polycrystalline cells made from multiple silicon crystals have a temperature coefficient range from - 0.39 to 0.43 % /°C
  • Monocrystalline cells: Monocrystalline cells are made of single silicon crystals that have a temperature coefficient range from - 0.35 to 0.40 % /°C
  • Monocrystalline IBC cells: Monocrystalline Interdigitated Back Contact (IBC) solar cells have a temperature coefficient range from - 0.28 to 0.31 % /°C
  • Monocrystalline HJT cells: Monocrystalline heterojunction solar cells have a temperature coefficient range from - 0.25 to 0.27 % /°C

Which type of Solar Panel has the lowest temperature coefficient?

To achieve the lowest temperature coefficient the structure of solar cells has to have a higher excitation resistance for its bound electrons to prevent it from excitation when the temperature increases. Therefore, the Monocrystalline HJT solar panels have the lowest temperature coefficient of - 0.25 to 0.27 % /°C making them not only suitable for high-temperature areas but also making them more efficient in real output power.