Turning Up the Heat: How Florida’s Heat Affects Solar Panel Arrays 

Heat’s Impact on Solar Efficiency 

One of the less intuitive aspects of solar energy in Florida is the way heat affects solar panel efficiency. While Florida’s abundant sunshine is a boon for solar power generation, the state’s high temperatures can detract from the efficiency of solar panels. 

The Efficiency-Temperature Relationship  

Solar panels are designed to convert sunlight into electricity, but their efficiency is decreased by increased heat. Most solar panels are rated based on their performance at around 25°C (77°F). However, as temperatures rise above this threshold, the efficiency of solar panels typically decreases for every degree of heat. In a state like Florida, where summer temperatures can often exceed this benchmark, solar panels can experience reduced efficiency. This reduction in efficiency is due to the increased resistance in the semiconductor materials used in the panels. This resistance limits their ability to convert sunlight into electrical energy efficiently. 

Requirement for More Panels  

This drop in efficiency directly affects the number of solar panels required to meet specific energy production targets. For instance, if a homeowner in Florida is aiming for a certain level of electricity generation to meet their household needs, he will need more panels to make up the difference in efficiency loss. For a company that wishes to fulfill a production guarantee, the reduced efficiency due to heat means they may need to install more solar panels than they would in a cooler climate to meet those production requirements. Additional panels for heat-efficiency loss increase the overall size of the solar array, thereby impacting both the initial investment and the space required for installation. 

Calculating the Solar Array Size  

The calculation of how many additional panels are needed varies depending on the following factors:

  • the average local temperatures,
  • the specific type of solar panels used, and
  • the desired energy output.

Solar installers in Florida typically use detailed climatic data and sophisticated modeling tools to estimate the ideal size of a solar array. Most Florida solar arrays are constructed larger than the national average so that they can compensate for efficiency losses due to heat. Read more about why Florida’s solar costs are higher than the national average here.

Balancing Cost and Production  

This need for a larger array can mean higher upfront costs for Floridian homeowners and businesses investing in solar energy. However, it is a necessary adjustment to ensure that the solar system delivers the expected performance despite the challenging heat conditions.

Moreover, despite the need for more panels, solar energy in Florida remains a cost-effective solution over the long term, especially when considering the state’s high solar irradiance and the availability of various solar incentives. 


The impact of heat on solar efficiency in Florida is a crucial consideration when planning a solar installation. Understanding this relationship helps in accurately sizing the solar array to ensure it meets your energy production goals. Ultimately, it will optimize your investment in solar technology for the Sunshine State. Curious about solar in Florida? Read our guide here.

Before You Go Solar

While adapting to Florida’s heat is crucial for solar panel efficiency, it’s just one piece of the energy efficiency puzzle. Home Renew advocates for an ‘efficiency-first’ approach, ensuring your home is optimized for energy use before installing solar panels. Discover how our holistic strategy can lead to even greater savings on your solar panels and your home’s efficiency.

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