See the chart below to see how different types of solar panel installations compare in Erwin.
* Amounts listed in kWh/m2/day (kilowatt hours per square meter per day).
* See glossary & definitions below.
Based on historical Erwin, TN data, solar panels that are tilted towards the equator at an angle equal to the latitude will produce the maximum solar energy output in Erwin. [1]
Erwin has an average monthly Global Horizontal Irradiance (GHI) of 4.12 kilowatt hours per square meter per day (kWh/m2/day), which is approximately 9% greater than the average monthly Direct Normal Irradiance (DNI) of 3.78 kWh/m2/day. [1]
Solar installations in Erwin that are always titled at the latitude of Erwin (Average Tilt at Latitude or ATaL) average 4.68 kWh/m2/day, or about 14% greater than the average monthly GHI of 4.12 kWh/m2/day and approximately 24% greater than the average monthly DNI of 3.78 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 Erwin.
* Amounts listed in kWh/m2/day (kilowatt hours per square meter per day)
Erwin, TN has a average annual solar radiation value of 4.93 kilowatt hours per square meter per day (kWh/m2/day). [1]
The month with the highest historical solar radition values in Erwin is August with an average of 5.73 kWh/m2/day, followed by September at 5.57 kWh/m2/day and May at 5.37 kWh/m2/day. [1]
The three months that historically average the lowest average solar radiation levels in Erwin (Tennessee) are December with an average of 3.6 kWh/m2/day, followed by January with an average of 3.77 kWh/m2/day and February at 4.3 kWh/m2/day. [1]
The average monthly solar radiation level in Erwin, TN, of 4.93 kilowatt hours per square meter per day (kWh/m2/day) is approximately 25% greater than the average level of 3.93 kWh/m2/day in a city with historically low levels (WA) and is approximately 25% 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 Erwin 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 town of Erwin, TN at this current time.
Monthly AC solar system output averages for Erwin (tn). Month-by-month solar power, as ranked by AC output, in Erwin. [2]
* Amounts listed in kWhac (kilowatt hours (AC))
Erwin (TN) has a average annual solar AC output value of 5406.2 kilowatt hours (AC). [2]
The month with the highest historical solar power output in Erwin is August with an average of 516.06 kWhac, followed by May at 498.23 kWhac and September at 491.28 kWhac. [2]
The three months that historically average the lowest average solar output levels in Erwin (Tennessee) are December with an average of 351.85 kWhac, followed by January with an average of 369.14 kWhac and February at 373.74 kWhac. [2]
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The town of Erwin, TN in Unicoi County has an approximate population of 6,097. [6]
To learn more about solar energy and solar power Erwin, TN, or for more solar-related resources for Erwin, visit the U.S. Energy Information Administration.
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