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What is Sun Number Score and How You Can Find it For Your Residential Solar Panel?



People planning to buy solar panels should understand the term “Sun Number Score” or "Sun Number Rating" developed through a partnership with Zillow with the help of the U.S. Department of Energy's SunShot Grant to promote renewable energy. Finding the solar score of your home is essential in determining whether your home is perfect for solar energy system installation. Keep on reading to learn what a sun number is and how to calculate it for your home.

What is a Sun Number?

It is a number between 0 and 100 that shows a home’s solar potential and how appropriate it is for rooftop solar and on ground solar services. The higher the sun number score is, the better your home is suited for solar panel installation and solar inverter. Using this score, you can easily understand your home’s ability for producing solar energy without learning all the unwanted solar industry terminologies or jargon.

What is a Good Sun Number?

Achieving a score of 100 sun number is not possible for all homes. It is a very rare case. A score of 70 or higher is considered well for a home also it can assure excellent financial savings in the long term. The number above 70 indicates that solar is a worthwhile investment for your building. Keeping into account the high installation costs of a solar system, any financial savings will boost the system’s ROI.

What Factors Affect the Sun Number Score?

The sun number score is the combination of the following factors –

1.       Building score

The building solar score makes up for the majority of the complete sun number score. It has a maximum score of 80 points while a score less than 50 is not considered fine. The residential building is analyzed based on the roof orientation, roof shading, roof size, and roof pitch.

2.       Local climate score

Determining the regional climate score is essential no matter whether you’re interested in solar street light installation, rooftop panels, or other solar systems. The amount of sunlight that hits the surface of the solar system directly affects the amount of solar energy that a system generates. Seasonal weather patterns and climatic conditions play a significant role.

For example, if you live in regions with tall trees and large buildings, the sun number score would be lower. To calculate the regional climate score of your local region, consider the solar irradiance data from NREL, a short of the National Renewable Energy Laboratory website.  

3.       Solar cost score

It is the smallest contributor that takes into account the cost of solar installation in your local region. The maximum solar cost score of 4 means low solar installation costs in your area.

4.       Electricity rates score

The maximum electricity rate score of 8 means the higher sun number of your home’s solar investment. A lower sun number means low electricity rates and a higher sun number means higher average electric rates.

So, find your home’s sun number score to find the suitability of a solar investment.

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