See the chart below to see how different types of solar panel installations compare in Gretna.
* Amounts listed in kWh/m2/day (kilowatt hours per square meter per day).
* See glossary & definitions below.
Based on historical Gretna, VA data, solar panels that are tilted towards the equator at an angle equal to the latitude will produce the maximum solar energy output in Gretna. [1]
Gretna has an average monthly Global Horizontal Irradiance (GHI) of 4.34 kilowatt hours per square meter per day (kWh/m2/day), which is approximately 2% less than the average monthly Direct Normal Irradiance (DNI) of 4.44 kWh/m2/day. [1]
Solar installations in Gretna that are always titled at the latitude of Gretna (Average Tilt at Latitude or ATaL) average 5.04 kWh/m2/day, or about 16% greater than the average monthly GHI of 4.34 kWh/m2/day and approximately 14% greater than the average monthly DNI of 4.44 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 Gretna.
* Amounts listed in kWh/m2/day (kilowatt hours per square meter per day)
Gretna, VA has a average annual solar radiation value of 5.22 kilowatt hours per square meter per day (kWh/m2/day). [1]
The month with the highest historical solar radition values in Gretna is April with an average of 5.8 kWh/m2/day, followed by June at 5.73 kWh/m2/day and August at 5.66 kWh/m2/day. [1]
The three months that historically average the lowest average solar radiation levels in Gretna (Virginia) are December with an average of 4.21 kWh/m2/day, followed by January with an average of 4.32 kWh/m2/day and November at 4.81 kWh/m2/day. [1]
The average monthly solar radiation level in Gretna, VA, of 5.22 kilowatt hours per square meter per day (kWh/m2/day) is approximately 33% greater than the average level of 3.93 kWh/m2/day in a city with historically low levels (WA) and is approximately 21% 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 Gretna 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 Gretna, VA at this current time.
Monthly AC solar system output averages for Gretna (va). Month-by-month solar power, as ranked by AC output, in Gretna. [2]
* Amounts listed in kWhac (kilowatt hours (AC))
Gretna (VA) has a average annual solar AC output value of 5694.8 kilowatt hours (AC). [2]
The month with the highest historical solar power output in Gretna is March with an average of 518.01 kWhac, followed by April at 516.9 kWhac and August at 502.25 kWhac. [2]
The three months that historically average the lowest average solar output levels in Gretna (Virginia) are December with an average of 409.39 kWhac, followed by January with an average of 423.28 kWhac and February at 428.86 kWhac. [2]
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The town of Gretna, VA in Pittsylvania County has an approximate population of 1,267. [6]
To learn more about solar energy and solar power Gretna, VA, or for more solar-related resources for Gretna, visit the U.S. Energy Information Administration.
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