Based on historical Derby, CT data, solar panels that are tilted towards the equator at an angle equal to the latitude will produce the maximum solar energy output in Derby.
Derby has an average monthly Global Horizontal Irradiance (GHI) of 3.92 kilowatt hours per square meter per day (kWh/m2/day), which is approximately 1% greater than the average monthly Direct Normal Irradiance (DNI) of 3.89 kWh/m2/day. 
Solar installations in Derby that are always titled at the latitude of Derby (Average Tilt at Latitude or ATaL) average 4.64 kWh/m2/day, or about 18% greater than the average monthly GHI of 3.92 kWh/m2/day and approximately 19% greater than the average monthly DNI of 3.89 kWh/m2/day. 
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 (DNI)
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 (ATaL)
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.
Solar Radiation Levels in Derby
Solar Radiation Data in Derby, CT
See the chart below for monthly solar radiation levels in Derby.
* Amounts listed in kWh/m2/day (kilowatt hours per square meter per day)
Solar Radiation Analysis for Derby, CT
Derby, CT has a average annual solar radiation value of 4.43 kilowatt hours per square meter per day (kWh/m2/day). 
The month with the highest historical solar radition values in Derby is June with an average of 5.34 kWh/m2/day, followed by July at 5.3 kWh/m2/day and August at 5.26 kWh/m2/day. 
The three months that historically average the lowest average solar radiation levels in Derby (Connecticut) are December with an average of 2.91 kWh/m2/day, followed by November with an average of 3.15 kWh/m2/day and January at 3.34 kWh/m2/day. 
Solar Power Comparison: Derby vs. the U.S.
Solar Power Levels in Derby
The average monthly solar radiation level in Derby, CT, of 4.43 kilowatt hours per square meter per day (kWh/m2/day) is approximately 19% greater than the average level of 3.73 kWh/m2/day in a city with historically low levels (WA) and is approximately 33% less than the average level of 6.6 kWh/m2/day in a city with historically high levels (NV). 
→ Values listed as 0 (zero) are not available (N/A).
Solar Power: vs. the U.S.
Below is a month-by-month comparison of how average Derby solar radiation levels compare to average levels in a city with historcially high levels (NV) and a city with historically low levels (WA). 
→ 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 Derby, CT at this current time.
However, Derby is in New Haven County and New Haven County has at least 2,983 solar insallations right now. 
Solar Power Output in Derby
The Power of Solar in Derby, CT
Monthly AC solar system output averages for Derby (ct). Month-by-month solar power, as ranked by AC output, in Derby. 
* Amounts listed in kWhac (kilowatt hours (AC))
Solar Output Analysis for Derby, CT
Derby (CT) has a average annual solar AC output value of 5242.27 kilowatt hours (AC). 
The month with the highest historical solar power output in Derby is May with an average of 518.94 kWhac, followed by July at 510.27 kWhac and August at 505.34 kWhac. 
The three months that historically average the lowest average solar output levels in Derby (Connecticut) are December with an average of 307.99 kWhac, followed by November with an average of 314.53 kWhac and January at 356.24 kWhac. 
Cost of Utilities in Derby
Derby Electricity Costs
Electricity prices (residential) in Derby averaged 22.05 cents per kilowatthour (¢/kWh) in September 2018, which was about 69% more than the overall U.S. average residential electricity rate of 13.01¢/kWh in September. 
Solar Power Poll: Derby
Vote now: Given all of the data and analysis provided for Derby, is solar power a good choice for residents of this city?
Derby Natural Gas Costs
Natural gas prices (residential) in Connecticut averaged $22.39 per thousand cubic feet (Mcf) in September 2018, which was approximately 29% more than the overall U.S. average residential natural gas rate of $17.32 per Mcf in September. 
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"Solar cells convert sunlight into electricity through a physical process known as the photovoltaic effect.",
"Nineteen-year-old Edmund Becquerel, a French experimental physicist, discovered the basis of solar energy in 1839.",
"Various missions to space by different countries are known to utilize solar energy as a main power source.",
"The largest solar power plant in the world covers 1000 acres & is located in the Mojave Desert in California.",
"Some tax incentives and rebate programs are designed to spur the use of solar energy. These vary by location.",
"Solar power is renewable, does not produce any pollutants and is one of the cleanest source of energy.",
"It takes light about 8 minutes, 19 seconds to travel the 93,000,000 miles from the sun's surface to us on Earth.",
"About half of the sun's energy is absorbed by the Earth's surface; about 30 percent is reflected back from the surface.",
"The solar energy that strikes the Earth in one hour could provide all of the Earth's energy needs for a complete year."
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