See the chart below to see how different types of solar panel installations compare in 20194.
* Amounts listed in kWh/m2/day (kilowatt hours per square meter per day).
* See glossary & definitions below.
Based on historical 20194 data, solar panels that are tilted towards the equator at an angle equal to the latitude will produce the maximum solar energy output in 20194. [1]
The region associated with 20194 has an average monthly Global Horizontal Irradiance (GHI) of 4.16 kilowatt hours per square meter per day (kWh/m2/day), which is approximately 5% less than the average monthly Direct Normal Irradiance (DNI) of 4.39 kWh/m2/day. [1]
Solar installations in 20194 that are always titled at the latitude of Reston (Average Tilt at Latitude or ATaL) average 4.9 kWh/m2/day, or about 18% greater than the average monthly GHI of 4.16 kWh/m2/day and approximately 12% greater than the average monthly DNI of 4.39 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 20194.
* Amounts listed in kWh/m2/day (kilowatt hours per square meter per day)
The region associated with 20194 has a average annual solar radiation value of 4.95 kilowatt hours per square meter per day (kWh/m2/day). [1]
The month with the highest historical solar radition values in 20194 is June with an average of 5.69 kWh/m2/day, followed by August at 5.65 kWh/m2/day and September at 5.53 kWh/m2/day. [1]
The three months that historically average the lowest average solar radiation levels in 20194 are December with an average of 3.44 kWh/m2/day, followed by January with an average of 3.86 kWh/m2/day and November at 4.24 kWh/m2/day. [1]
The average monthly solar radiation level in 20194, of 4.95 kilowatt hours per square meter per day (kWh/m2/day) is approximately 26% 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 20194 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 have data on solar panel installations in ZIP Code 20194 at the current time.
Monthly AC solar system output averages for 20194. Month-by-month solar power, as ranked by AC output, in 20194. [2]
* Amounts listed in kWhac (kilowatt hours (AC))
20194 has a average annual solar AC output value of 5595.7 kilowatt hours (AC). [2]
The month with the highest historical solar power output in 20194 is August with an average of 518.04 kWhac, followed by May at 515.8 kWhac and April at 513.2 kWhac. [2]
The three months that historically average the lowest average solar output levels in 20194 are December with an average of 347.74 kWhac, followed by January with an average of 397.36 kWhac and November at 402.38 kWhac. [2]
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The ZIP code 20194 is associated with the city of Reston in Fairfax County in Virginia.
To learn more about solar energy and solar power in 20194, or for more solar-related resources for VA, check out the U.S. Energy Information Administration.
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