See the chart below to see how different types of solar panel installations compare in Herrin.
* Amounts listed in kWh/m2/day (kilowatt hours per square meter per day).
* See glossary & definitions below.
Based on historical Herrin, IL data, solar panels that are tilted towards the equator at an angle equal to the latitude will produce the maximum solar energy output in Herrin. [1]
Herrin has an average monthly Global Horizontal Irradiance (GHI) of 4.24 kilowatt hours per square meter per day (kWh/m2/day), which is approximately 1% less than the average monthly Direct Normal Irradiance (DNI) of 4.28 kWh/m2/day. [1]
Solar installations in Herrin that are always titled at the latitude of Herrin (Average Tilt at Latitude or ATaL) average 4.85 kWh/m2/day, or about 14% greater than the average monthly GHI of 4.24 kWh/m2/day and approximately 13% greater than the average monthly DNI of 4.28 kWh/m2/day. [1]
Global Horizontal Irradiance: The total amount of solar radiation that is received per unit area by a surface that is always positioned in a horizontal manner.
Direct Normal Irradiance: The total amount of solar radiation received per unit area by a surface that is always perpendicular to the sun rays that come in a straight line from the direction of the sun at its current position in the sky.
Average Tilt at Latitude: The total amount of solar radiation received per unit area by a surface that is tilted toward the equator at an angle equal to the current latitude. ATaL will often produce the optimum energy output.
See the chart below for monthly solar radiation levels in Herrin.
* Amounts listed in kWh/m2/day (kilowatt hours per square meter per day)
Herrin, IL has a average annual solar radiation value of 5.01 kilowatt hours per square meter per day (kWh/m2/day). [1]
The month with the highest historical solar radition values in Herrin is August with an average of 6.07 kWh/m2/day, followed by September at 6 kWh/m2/day and June at 5.92 kWh/m2/day. [1]
The three months that historically average the lowest average solar radiation levels in Herrin (Illinois) are December with an average of 3.26 kWh/m2/day, followed by January with an average of 3.75 kWh/m2/day and November at 4.15 kWh/m2/day. [1]
The average monthly solar radiation level in Herrin, IL, of 5.01 kilowatt hours per square meter per day (kWh/m2/day) is approximately 27% greater than the average level of 3.93 kWh/m2/day in a city with historically low levels (WA) and is approximately 24% less than the average level of 6.61 kWh/m2/day in a city with historically high levels (NV). [1]
→ Values listed as 0 (zero) are not available (N/A).
Below is a month-by-month comparison of how average Herrin solar radiation levels compare to average levels in a city with historcially high levels (NV) and a city with historically low levels (WA). [1]
→ k/m/d = kWh/m2/day = kilowatt hours per square meter per day.
→ Values listed as 0 (zero) are not available (N/A).
We do not currently have data on solar panel installations in the city of Herrin, IL at this current time.
Monthly AC solar system output averages for Herrin (il). Month-by-month solar power, as ranked by AC output, in Herrin. [2]
* Amounts listed in kWhac (kilowatt hours (AC))
Herrin (IL) has a average annual solar AC output value of 5669.47 kilowatt hours (AC). [2]
The month with the highest historical solar power output in Herrin is August with an average of 561.43 kWhac, followed by September at 538.6 kWhac and June at 536.25 kWhac. [2]
The three months that historically average the lowest average solar output levels in Herrin (Illinois) are December with an average of 330.95 kWhac, followed by January with an average of 383.77 kWhac and February at 400.36 kWhac. [2]
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The city of Herrin, IL in Williamson County has an approximate population of 12,501. [6]
To learn more about solar energy and solar power Herrin, IL, or for more solar-related resources for Herrin, visit the U.S. Energy Information Administration.
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