Dunn, North Carolina represents a moderately good location for year-round solar energy generation, though with significant seasonal variations that potential solar installers should understand before making investment decisions.

Seasonal Solar Performance

The solar energy output in Dunn varies considerably throughout the year. Summer provides the strongest performance at 6.60 kWh per day per kilowatt of installed solar capacity, making it the peak season for solar generation. Spring follows closely behind with 6.03 kWh per day per kilowatt, representing nearly equivalent performance to summer months. Autumn sees a notable decline to 4.41 kWh per day per kilowatt, while winter drops significantly to just 2.76 kWh per day per kilowatt. This means winter solar production is less than half of summer output, which is typical for locations in the Northern Temperate Zone but represents a substantial seasonal challenge for energy planning.

Optimal Installation Configuration

For fixed solar panel installations in Dunn, the ideal tilt angle is 31 degrees facing south to maximize total year-round energy production. This angle is calculated by analyzing daily solar elevation angles throughout the year and weighting them according to solar irradiance data to determine the optimal compromise for all seasons.

Local Environmental Challenges

Several environmental and weather factors in the Dunn area can impact solar energy production:

• High humidity and frequent cloud cover during summer months, particularly from afternoon thunderstorms common in North Carolina
• Occasional severe weather including hurricanes, strong winds, and hail that can damage solar installations
• Pine pollen in spring, which is exceptionally heavy in North Carolina and can coat solar panels
• Ice storms in winter that can temporarily reduce output and potentially damage equipment

Preventative Measures for Better Performance

Several installation strategies can help maximize solar energy production despite these challenges:

• Install panels with adequate spacing and ventilation to reduce efficiency losses from high humidity and heat
• Use mounting systems rated for high wind loads and impact-resistant panels to withstand severe weather
• Establish regular cleaning schedules, especially during pollen season in spring
• Consider micro-inverters or power optimizers to minimize production losses when individual panels are shaded or dirty
• Ensure proper drainage around ground-mounted systems to prevent water accumulation

Overall, while Dunn's location provides decent solar potential, the significant winter reduction in output and local environmental challenges require careful planning and proper installation techniques to achieve optimal long-term performance.

Note: The Northern Temperate Zone extends from 35° latitude North up to 66.5° latitude.

So far, we have conducted calculations to evaluate the solar photovoltaic (PV) potential in 4253 locations across the United States. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.

Link: Solar PV potential in the United States by location

Solar output per kW of installed solar PV by season in Dunn

Seasonal solar PV output for Latitude: 35.3144, Longitude: -78.6174 (Dunn, United States), based on our analysis of 8760 hourly intervals of solar and meteorological data (one whole year) retrieved for that set of coordinates/location from NASA POWER (The Prediction of Worldwide Energy Resources) API:

 

Ideally tilt fixed solar panels 31° South in Dunn, United States

To maximize your solar PV system's energy output in Dunn, United States (Lat/Long 35.3144, -78.6174) throughout the year, you should tilt your panels at an angle of 31° South for fixed panel installations.

As the Earth revolves around the Sun each year, the maximum angle of elevation of the Sun varies by +/- 23.45 degrees from its equinox elevation angle for a particular latitude. Finding the exact optimal angle to maximise solar PV production throughout the year can be challenging, but with careful consideration of historical solar energy and meteorological data for a certain location, it can be done precisely.

We use our own calculation, which incorporates NASA solar and meteorological data for the exact Lat/Long coordinates, to determine the ideal tilt angle of a solar panel that will yield maximum annual solar output. We calculate the optimal angle for each day of the year, taking into account its contribution to the yearly total PV potential at that specific location.

Seasonally adjusted solar panel tilt angles for Dunn, United States

If you can adjust the tilt angle of your solar PV panels, please refer to the seasonal tilt angles below for optimal solar energy production in Dunn, United States. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 31° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
19° South in Summer	40° South in Autumn	51° South in Winter	28° South in Spring

Our recommendations take into account more than just latitude and Earth's position in its elliptical orbit around the Sun. We also incorporate historical solar and meteorological data from NASA's Prediction of Worldwide Energy Resources (POWER) API to assign a weight to each ideal angle for each day based on its historical contribution to overall solar PV potential during a specific season.

This approach allows us to provide much more accurate recommendations than relying solely on latitude, as it considers unique weather conditions in different locations sharing the same latitude worldwide.

Calculate solar panel row spacing in Dunn, United States

We've added a feature to calculate minimum solar panel row spacing by location. Enter your panel size and orientation below to get the minimum spacing in Dunn, United States.

Our calculation method

1. Solar Position:
   We determine the Sun's position on the Winter solstice using the location's latitude and solar declination.
2. Shadow Projection:
   We calculate the shadow length cast by panels using trigonometry, considering panel tilt and the Sun's elevation angle.
3. Minimum Spacing:
   We add the shadow length to the horizontal space occupied by tilted panels.

This approach ensures maximum space efficiency while avoiding shading during critical times, as the Winter solstice represents the worst-case scenario for shadow length.

Topography for solar PV around Dunn, United States

Topography Around Dunn, North Carolina

Dunn is located in the Coastal Plain region of central North Carolina, characterized by relatively flat terrain with gentle rolling hills. The area sits at a moderate elevation of approximately 200 feet above sea level, positioned within Harnett County. This region represents a transitional zone between the higher elevations of the Piedmont to the west and the lower coastal areas to the east.

The landscape around Dunn features predominantly agricultural land interspersed with pine forests and mixed hardwood stands. The terrain is generally well-drained with sandy loam soils typical of the inner Coastal Plain. Small creeks and tributaries, including branches of the Cape Fear River system, meander through the area, creating minor variations in elevation but no significant topographical obstacles.

The rolling topography consists of broad, gentle slopes with gradual elevation changes rarely exceeding 50 feet over considerable distances. This creates an undulating landscape that is neither completely flat nor dramatically hilly. The area experiences minimal steep grades, with most slopes falling within a manageable range for development and agricultural use.

Optimal Areas for Large-Scale Solar Development

The most suitable locations for large-scale solar photovoltaic installations around Dunn would be the extensive open agricultural fields that dominate the surrounding countryside. These cleared areas, many currently used for crop production or pasture, offer the flat to gently sloping terrain ideal for solar panel arrays. The relatively level topography minimizes grading requirements and reduces installation costs while maximizing panel efficiency through optimal positioning.

Former tobacco fields and other agricultural areas that have been taken out of production present particularly attractive opportunities. These sites often feature good road access for construction and maintenance vehicles, existing electrical infrastructure connections, and clear title situations that can facilitate development. The sandy soils common in these areas provide excellent drainage, reducing concerns about water accumulation around solar installations.

Areas with southern-facing slopes would be especially valuable for solar development, as they naturally orient panels toward the sun's path. The gentle gradients typical of the region allow for flexible array positioning while maintaining good drainage patterns. Open fields located away from wooded areas would minimize shading concerns and reduce the need for ongoing vegetation management.

The proximity to existing electrical transmission infrastructure along major roads and near the town center makes certain agricultural areas particularly attractive for utility-scale solar development. Areas with good access to three-phase power lines and substations would significantly reduce interconnection costs and complexity. The relatively stable geology and minimal flood risk in most elevated areas around Dunn further enhance the suitability for long-term solar installations.

United States solar PV Stats as a country

United States ranks 2nd in the world for cumulative solar PV capacity, with 95,209 total MW's of solar PV installed. This means that 3.40% of United States's total energy as a country comes from solar PV (that's 26th in the world). Each year United States is generating 289 Watts from solar PV per capita (United States ranks 15th in the world for solar PV Watts generated per capita). [source]

Are there incentives for businesses to install solar in United States?

Yes, there are several incentives for businesses wanting to install solar energy in the United States. These include federal tax credits, state and local rebates, net metering policies, and renewable energy certificates (RECs). Additionally, many states have enacted legislation that requires utilities to purchase a certain amount of electricity from renewable sources such as solar.

Do you have more up to date information than this on incentives towards solar PV projects in United States? Please reach out to us and help us keep this information current. Thanks!

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Compare this location to others worldwide for solar PV potential

The solar PV analyses available on our website, including this one, are offered as a free service to the global community. Our aim is to provide education and aid informed decision-making regarding solar PV installations.

However, please note that these analyses are general guidance and may not meet specific project requirements. For in-depth, tailored forecasts and analysis crucial for feasibility studies or when pursuing maximum ROI from your solar projects, feel free to contact us; we offer comprehensive consulting services expressly for this purpose.

Helping you assess viability of solar PV for your site

Calculate Your Optimal Solar Panel Tilt Angle: A Comprehensive Guide

Enhance your solar panel's performance with our in-depth guide. Determine the best tilt angle using hard data, debunk common misunderstandings, and gain insight into how your specific location affects solar energy production.