How Heat Affects Solar Panels.

How Heat Affects Solar Panels.

Solar Panels Harnessing Renewable Energy

Solar panel is the necessary and greatest weapon of the solar model. The concept of solar energy is incomplete without the utilization of solar panels as the sunlight that falls on earth is captured by them. Inside the solar panels are Photovoltaic cells (PV cells), which play a key role in transforming sunlight into electrical power. It is how solar panels and solar energy work. 

Due to its renewable nature and the aim of efficiently utilizing an abundant resource, its wide adoption is taking place around the world. Countries like South Korea, India, China, Germany, the USA, and Japan are some of the top – users of solar energy models. Developed countries switching over to solar energy proves that it is reliable and valued across the globe because of the benefits it offers. 

But with some benefits come the challenges like Heat, humidity, space occupation, installation expenses, etc. Most of the challenges can be made ineffective with technological advancements, but problems like Heat and humidity seem to be out of the range of technical upgrades. Many must be questioning: Really? Does Heat affect solar panels? The solution to this can be found in the upcoming sections.

Effect on the efficiency of solar panels by the Heat.

Just like every other person, you too might be thinking that an increase in Heat enables the solar panels to produce more voltage, but that's not the fact! It is pretty much expected to have an opinion like that because all we know, in layman's language, is that the production capability of solar panels is regulated by the sun. The more sunlight and Heat, the more electricity generation; but unfortunately, the reality is reversed. An increase in temperature or Heat will always negatively impact the solar panels.

The efficiency of photovoltaic cells revolves around the 'temperature coefficient' of solar panels. Basically, the temperature coefficient is the amount of change in the efficiency of solar panels due to variations in weather temperature. For instance, the temperature coefficient of a solar panel is -230%. It would mean that if the temperature of the solar panel goes above 25o Celsius, the efficiency of the solar panel will drop by 230%. In simple terms, solar panels will generate electricity slower by 230% of normal speed. Vice-versa would be in case of a decrease in heat/temperature of solar panels.

Impact of Heat on Solar Panel Efficiency.

In crisp, we can say that Heat can either enhance or diminish the efficiency of solar panels. If the heat increases, the efficiency level will decrease, and when the Heat decreases, the efficiency level will increase. The standard temperature of a solar panel is 25 C; high or low will indicate the increase or decrease in heat level. However, have you ever pondered the reason behind this occurrence? Read further to know.

Why does increased Heat reduce the efficiency of solar panels?

Every one of us would have come across numerous articles on solar energy and solar panels. Almost all of them serve us with big-picture knowledge about solar energy. But to know the reason behind the negative effect of Heat on the panels, we have to understand what happens inside the panels when the sunlight hits them. 

In a summarized way, we think that sunlight helps the panels to produce voltage. The actual detailed picture of it is a bit different. Actually, electricity is not produced directly by the sunlight; it is formed by the electrons that are inside the solar panels. 

'Electrons are the smallest particles that revolve around atoms. It carries electric charge within it and creates electricity when moving.' 

In simplest words, when the sunlight hits the solar panels, it helps the electron to initiate their movement. This movement of electrons causes electricity generation. The speed of electron movement directly affects the speed of generation. Therefore, any effect on the movement of electrons would lead to low efficiency of solar panels. Thus, an increase in Heat affects the movement of electrons in certain ways:

  • Atomic Vibrations

Just as sunlight affects the movement of electrons, Heat is responsible for causing vibration in atoms. Increased Heat can lead to high vibrations in atoms. These high atomic vibrations make it difficult for the electrons to move around the material and cause energy loss in electrons. Thus, the electrons are left with less energy, which results in low efficiency of solar panels.     

  • Resistance 

Think about air and water; which substance is difficult to run in? Water, right? Similarly, an increased level of Heat makes it difficult for the electrons to move, i.e. causing resistance. As a result, electrons utilize some of the energy for movement and are left with less energy within them. Less energy means low generation capacity. 

  • Behavior of Material

Usually, solar panels are made up of different materials. Every material reacts in different ways. Some show positive reactions to Heat, while some show negative. This variation in reaction to Heat may cause hurdles in the movement of electrons. It can also cause energy loss, thus lowering the efficiency. 

  • Wasted Energy

Increased Heat causes lots of disturbance inside the solar panels that results in slowing down the movement of electrons. Most of the time, electrons lose the energy that they are carrying because of such disturbances. Thus affecting the production level and efficiency of solar panels.


To sum up the discussion, we can create a perception that Heat affects the solar panels unfavorably. It reduces the efficiency of solar panels and causes less electricity generation. Solar panel developers and users must evaluate strategies to manage the increased Heat. Thus ensuring the potential functioning and long lifespan of eco-friendly energy systems.      

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