Based on historical Waltham, MA data, solar panels that are tilted towards the equator at an angle equal to the latitude will produce the maximum solar energy output in Waltham.
Waltham has an average monthly Global Horizontal Irradiance (GHI) of 3.83 kilowatt hours per square meter per day (kWh/m2/day), which is approximately equal to the average monthly Direct Normal Irradiance (DNI) of 3.83 kWh/m2/day. 
Solar installations in Waltham that are always titled at the latitude of Waltham (Average Tilt at Latitude or ATaL) average 4.57 kWh/m2/day, or about 19% greater than the average monthly GHI of 3.83 kWh/m2/day and approximately 19% greater than the average monthly DNI of 3.83 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 Waltham
Solar Radiation Data in Waltham, MA
See the chart below for monthly solar radiation levels in Waltham.
* Amounts listed in kWh/m2/day (kilowatt hours per square meter per day)
Solar Radiation Analysis for Waltham, MA
Waltham, MA has a average annual solar radiation value of 4.59 kilowatt hours per square meter per day (kWh/m2/day). 
The month with the highest historical solar radition values in Waltham is August with an average of 5.64 kWh/m2/day, followed by July at 5.6 kWh/m2/day and June at 5.41 kWh/m2/day. 
The three months that historically average the lowest average solar radiation levels in Waltham (Massachusetts) are December with an average of 2.95 kWh/m2/day, followed by November with an average of 3.13 kWh/m2/day and January at 3.36 kWh/m2/day. 
Solar Power Comparison: Waltham vs. the U.S.
Solar Power Levels in Waltham
The average monthly solar radiation level in Waltham, MA, of 4.59 kilowatt hours per square meter per day (kWh/m2/day) is approximately 23% greater than the average level of 3.73 kWh/m2/day in a city with historically low levels (WA) and is approximately 30% 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 Waltham 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 Waltham, MA at this current time.
However, Waltham is in Middlesex County and Middlesex County has at least 16,989 solar insallations right now. 
Solar Power Output in Waltham
The Power of Solar in Waltham, MA
Monthly AC solar system output averages for Waltham (ma). Month-by-month solar power, as ranked by AC output, in Waltham. 
* Amounts listed in kWhac (kilowatt hours (AC))
Solar Output Analysis for Waltham, MA
Waltham (MA) has a average annual solar AC output value of 5428.86 kilowatt hours (AC). 
The month with the highest historical solar power output in Waltham is August with an average of 542.16 kWhac, followed by July at 537.19 kWhac and May at 526.08 kWhac. 
The three months that historically average the lowest average solar output levels in Waltham (Massachusetts) are December with an average of 310.83 kWhac, followed by November with an average of 315.11 kWhac and January at 358.51 kWhac. 
Cost of Utilities in Waltham
Waltham Electricity Costs
Electricity prices (residential) in Waltham averaged 22.15 cents per kilowatthour (¢/kWh) in September 2018, which was about 70% more than the overall U.S. average residential electricity rate of 13.01¢/kWh in September. 
Solar Power Poll: Waltham
Vote now: Given all of the data and analysis provided for Waltham, is solar power a good choice for residents of this city?
Waltham Natural Gas Costs
Natural gas prices (residential) in Massachusetts averaged $16.02 per thousand cubic feet (Mcf) in September 2018, which was approximately 8% less 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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