See the chart below to see how different types of solar panel installations compare in Derry.
* Amounts listed in kWh/m2/day (kilowatt hours per square meter per day).
* See glossary & definitions below.
Based on historical Derry, PA data, solar panels that are tilted towards the equator at an angle equal to the latitude will produce the maximum solar energy output in Derry. [1]
Derry has an average monthly Global Horizontal Irradiance (GHI) of 3.79 kilowatt hours per square meter per day (kWh/m2/day), which is approximately 12% greater than the average monthly Direct Normal Irradiance (DNI) of 3.39 kWh/m2/day. [1]
Solar installations in Derry that are always titled at the latitude of Derry (Average Tilt at Latitude or ATaL) average 4.32 kWh/m2/day, or about 14% greater than the average monthly GHI of 3.79 kWh/m2/day and approximately 27% greater than the average monthly DNI of 3.39 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 Derry.
* Amounts listed in kWh/m2/day (kilowatt hours per square meter per day)
Derry, PA has a average annual solar radiation value of 4.49 kilowatt hours per square meter per day (kWh/m2/day). [1]
The month with the highest historical solar radition values in Derry is July with an average of 5.65 kWh/m2/day, followed by August at 5.49 kWh/m2/day and September at 5.48 kWh/m2/day. [1]
The three months that historically average the lowest average solar radiation levels in Derry (Pennsylvania) are December with an average of 2.61 kWh/m2/day, followed by January with an average of 2.92 kWh/m2/day and November at 3.57 kWh/m2/day. [1]
The average monthly solar radiation level in Derry, PA, of 4.49 kilowatt hours per square meter per day (kWh/m2/day) is approximately 14% greater than the average level of 3.93 kWh/m2/day in a city with historically low levels (WA) and is approximately 32% 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 Derry 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 borough of Derry, PA at this current time.
Monthly AC solar system output averages for Derry (pa). Month-by-month solar power, as ranked by AC output, in Derry. [2]
* Amounts listed in kWhac (kilowatt hours (AC))
Derry (PA) has a average annual solar AC output value of 4975.73 kilowatt hours (AC). [2]
The month with the highest historical solar power output in Derry is July with an average of 511.45 kWhac, followed by August at 499.23 kWhac and September at 484.9 kWhac. [2]
The three months that historically average the lowest average solar output levels in Derry (Pennsylvania) are December with an average of 260.09 kWhac, followed by January with an average of 297.04 kWhac and February at 333.46 kWhac. [2]
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Vote now: Given all of the data and analysis provided for Derry, is solar power a good choice for residents of this borough?
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The borough of Derry, PA in Westmoreland County has an approximate population of 2,688. [6]
To learn more about solar energy and solar power Derry, PA, or for more solar-related resources for Derry, visit the U.S. Energy Information Administration.
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