Solar Panel and Backup Systems – How does Heat Affect Performance.

Some people have a misconception that the stronger the sun is the more energy your solar panel will produce. This is incorrect, Solar panels capture light from the sun and convert it into energy that can be utilized in your home. Solar panels are exposed to high amounts of heat especially on very hot summer days and the excessive heat can cause a drop in energy output from your solar panels. 

Why heat is bad for your solar panels?.

High temperatures don’t affect the amount of solar energy a solar panel receives, but it does affect how much energy they output. Solar panels use sunlight to produce energy and don’t need heat in any way. Under the standard test conditions (STC) Solar panels are tested at 25°C (77°F) and temperatures that go above that could affect your energy output. Solar panels could run 10 to 25% less productive on hot days reaching 90 degrees Fahrenheit or higher. If panels are operating in temperatures lower than 25°C, it will run most efficiently.  Lower temperatures mean that the solar panels will have optimal energy production on cold days making up for the loss you obtain in energy on hot summer days. 

Determining Your Efficiency.

To determine how much heat your solar panel can handle you can look at the manufacturer’s datasheet. You will see the maximum power temperature coefficient (Pmax). This gives you an indication of how much power your unit will lose if the temperature rises by 1°C above 25°C. @ STC (STC is the Standard Test Condition temperature where the module’s nameplate power is determined). It also tells you how much the efficiency of your system will increase with temperatures below 25°C. No matter where you are, your panel may be affected by the change of season. So, in most normal climates, the efficiency will balance out over the long run.  For areas where temperatures are normally higher than 25 degrees consult a professional to help you with alternatives. 

How Can I Prevent Heat On Solar Panels?

There will always be some energy output loss due to heat. But, there are several ways to mitigate the negative effects of high temperatures: 

  1. Install your panels a few inches above the roof to allow for convective airflow or add a ventilation fan for further cooling down your solar panels. 
  2. Make sure that your panels are made with light colores materials to minimize heat absorption. This is especially important if you live in an area with very high temperatures. 
  3. Place units like inverters and combiners in a shaded area and not in direct sunlight. 

Reduce Your Home’s Power Cost in Morris County, NJ, let us help you with your solar needs.

Greenhouse Solar is one of the leading solar companies in Morris County, NJ. We are Sonnen Certified, and our experienced teams are ready to answer all your questions about home solar systems and solar battery backup systems. We are here to help design, install, and maintain your solar system, completely customized to your needs and budget. To find out more about solar backup systems and residential solar in Morris County NJ, our company or services, please contact us today or visit our website at