Solar Panel Temperature Coefficient

Solar Panel Temperature Coefficient

We can see that the solar system is playing a huge role in Australia and nearby areas and a competitive substitute for fossil fuels and for those who want to choose a green and clean energy environment for a better future, especially for residential and commercial projects.Temperature is a critical factor that influences the performance of solar panels. It can have both direct and indirect effects on the efficiency of a solar photovoltaic (PV) system.

So the main question here comes:

Does temperature affect solar panels efficiency?

As we discussed earlier, temperature is a coefficient and a crucial aspect of efficiency of solar panels in different temperatures as well as different climatic conditions.

Here are the glimpse of what we are showing in this topic:

  • What the solar panel temperature coefficient is
  • The effect of temperature on solar panels
  • Factors that influence a solar panel temperature coefficient
  • How to optimise your panels’ efficiency

Strategies to Reduce Solar Panel Efficiency Loss

Implementing measures to reduce panel temperature is essential to minimize efficiency loss in solar panels, mainly due to temperature effects. Here are factors to consider:

1. Installation Type:

   – The type of solar panel installation significantly impacts panel temperature. For instance, angled, roof-mounted systems have lower temperatures than flat rooftop installations. Ensuring proper ventilation and spacing beneath the panels can help dissipate heat more effectively.

2. Panel Technology:

 –  Thin film solar panels have lower temperature coefficients than traditional monocrystalline or polycrystalline panels. They may exhibit temperature coefficients closer to -0.2% / °C, indicating less efficiency loss with increasing temperatures.

3. Roof Material:

   – The roof’s material under the solar panels can influence panel temperature. Certain roof types absorb more heat than others, increasing panel temperatures. When selecting solar panel placement, they should consider the heat absorption characteristics of the roof material to mitigate temperature-related efficiency losses.

By implementing these practical strategies to reduce solar panel temperatures, homeowners and installers can confidently minimize efficiency loss and optimize the performance of their solar energy systems. You have the capability to make a significant difference.

Understanding Solar Panel Temperature Coefficient Calculation

1. Measurement Standard:

   – Temperature measurements are typically conducted on the Celsius scale, where 77°F is equivalent to 25°C, serving as the industry standard baseline.

2. Observing Performance:

   – Solar panel performance is observed as temperatures rise from the industry standard. The percentage of power lost at a specific temperature above 25°C is noted.

3. Calculating Temperature Coefficient:

   – The percentage of power loss at a specific temperature is divided by the number of degrees Celsius above the industry standard for calculating the temperature coefficient. This provides the temperature coefficient expressed as a percentage per degree Celsius (°C).

4. Example Calculation:

   – For instance, if at 28°C (approximately 83°F) there’s a power loss of 1.08%, and this temperature is 3°C higher than the industry standard (25°C), the temperature coefficient would be -0.36%/°C Pmax (percentage per degree Celsius of the maximum power output).

5. Evaluating Performance:

   – To assess the panel’s Performance at higher temperatures, multiply the percentage of power lost at a specific temperature by the solar panel wattage. This yields the amount of power lost in watts. For example, if a 320W panel experiences a power loss of 1.08% at 28°C, the power loss would be 3.3W, reducing the productive output to 316.7W.

Understanding the temperature coefficient is not just about predicting and managing solar panel performance, it’s about empowering you to optimize your system’s efficiency in various conditions. This knowledge puts you in control, allowing you to make informed decisions about your solar energy system.


It is a metre which represents the rate at which the efficiency of solar decreases as soon as temperature rises. And nowadays, as there is high temperature it is important to know about the metre. It is an important factor because of solar panels operations which work effectively when it is in direct sunlight.

And there is a drawback also when it comes regarding temperature coefficient: Mostly, solar panels have a negative temperature coefficient too.

What is negative solar efficient?

It means when a little bit of temperature also rises then the efficiency decreases i.e, negatively correlated or we can say that solar panels work when it gets too hot( which is highly unlikely to say).

In other words, the Negative Coefficient indicates that when temperature rises then a certain %age drops in solar panels efficiency And in general solar panels work efficiently in 59 degree Fahrenheit. Then we can assume that solar panel temperature ranges between 59 degree to 95 degree Fahrenheit for general function.

Factors Affecting Solar Panels Temperature Coefficient

1. Panel Designs and Layout:

The structure, layout and design of solar panels plays a key role in affecting the solar panels temperature coefficient. There are 2 types of solar panels: Monocrystalline and Polycrystalline silicon where both ranges are different in every way and have approx coefficients ranging from -0.44 to 0.50 degree. There is one more type, Thin film solar panels where they have a tendency of lower temperature compared to other 2 panels.

2. Roof Materials:

Certain rooftop like roof mounted or ground mounted can absorb heat better but certain roof types can affect solar panel temperature. In terms of roofing types like Asphalt shingles, Metal, Tile, Wood etc are preferred.

Asphalt shingles:This type doesn’t absorb much sunlight.

Metal:This type is great at reflecting sunlight.


Tar and gravel

Wood/ synthetic cedar:This is a great option for a ground-mounted system or community solar farm.

Or we can say the lighter the colour the better efficiency. You want your roofing material to have a high solar reflectance so your roof itself remains cool and doesn’t increase  panels’ temperature. As we noted earlier, your panels lose efficiency if they go past their ideal solar panel temperature coefficient.

3.  Location:

Climatic changes and average temperature are important factors influencing solar panel efficiency. In hot and humid locations like Texas or Florida one has to deal with average daily temperature, which comes to the conclusion that solar panels are very hot and far from cool temperature. So, for this one needs to take every possible precautions for keeping panels cool. Also shading from trees and buildings , chimneys etc too affect solar panel temperature coefficient.

How temperature coefficient affects energy production is determined by two elements: Climate and average temp. At the place of installation

How to optimise efficiency:

One can optimise the solar energy system in other ways to produce maximum energy like: select high quality solar panels having lower temperature coefficients which enhances strategies( proper ventilation, spacing, shading and roofing materials).

For more info you can contact directly to

FAQ about Solar Panel Temperature Coefficient

1. How is the temperature coefficient calculated?

  It is calculated by seeing the % of power loss at a specific temperature above the industry standard, i.e, 25°C. 25°C divided by degrees Celsius above 25°C to obtain the coefficient.

2. Why is the temperature coefficient necessary for solar panel performance?

 For understanding the temperature coefficient that helps predict how a solar panel will perform under different temperature conditions. 

It allows homeowners and installers to willingly take efficiency losses and make informed decisions about panel placement and system design.

3. What does a negative temperature coefficient indicate?

A negative temperature coefficient means that as temperature increases, the power output of solar panels decreases. This is a common characteristic of most solar panels and is due to the materials used in their construction. It’s important to understand this as it helps predict how a solar panel will perform under different temperature conditions.

4. How can homeowners minimize the impact of temperature on solar panel efficiency?

 Homeowners can minimize efficiency losses due to temperature by choosing panel types with lower temperature coefficients, ensuring proper ventilation and spacing during installation, and considering panel orientation and tilt angles to optimize Performance in different weather conditions.

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