Barbourville, Kentucky, located in the Northern Temperate Zone, presents a moderately favorable location for year-round solar energy generation, though with significant seasonal variations that potential solar installers should carefully consider.

Seasonal Solar Performance

The solar energy output at this location shows dramatic differences throughout the year. Summer provides the strongest performance at 6.46 kWh per day per kW of installed solar capacity, making it the peak season for solar generation. Spring follows as the second-best season with 5.65 kWh per day per kW, offering nearly comparable output to summer months. Autumn sees a notable decline to 4.07 kWh per day per kW, while winter presents the most challenging conditions with only 2.36 kWh per day per kW. This winter output represents less than 37% of summer production, highlighting the significant seasonal challenge for consistent year-round energy generation.

Optimal Installation Configuration

For fixed solar panel installations at Barbourville, the ideal tilt angle is 32 degrees facing south to maximize total year-round production. This angle has been calculated by analyzing daily solar elevation angles throughout the year and weighting them according to solar irradiance potential, accounting for Earth's elliptical orbit around the sun.

Local Environmental and Weather Challenges

Several significant factors in the Barbourville area can impede solar energy production:

• Appalachian Mountain Topography: The surrounding mountainous terrain can create shadows during certain times of day, particularly in winter when the sun is lower in the sky
• High Humidity and Fog: Eastern Kentucky's humid climate frequently produces morning fog and haze that can reduce solar irradiance
• Frequent Cloud Cover: The region experiences considerable cloudy weather throughout the year, which directly impacts solar output
• Coal Dust and Air Pollution: Historical coal mining and processing activities in the region can contribute to atmospheric particulates that reduce solar panel efficiency

Preventative Measures for Enhanced Performance

To maximize solar energy production despite these challenges, several installation strategies should be considered: Panel placement should prioritize locations with minimal shading from surrounding hills or mountains, particularly focusing on southern exposures with clear sightlines. Installing panels at the recommended 32-degree tilt helps optimize performance while allowing rain to naturally clean the panel surfaces. Regular cleaning schedules become especially important in this location due to potential coal dust accumulation and general atmospheric particulates. Installing panels with easy access for maintenance can significantly improve long-term performance. Microinverters or power optimizers should be strongly considered instead of traditional string inverters, as they help minimize the impact of partial shading from topographical features or temporary cloud cover on overall system performance. Given the region's humidity, ensuring proper ventilation behind panels helps prevent moisture-related efficiency losses and extends equipment lifespan. Additionally, selecting panels and mounting systems specifically rated for high-humidity environments provides better long-term reliability.

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 Barbourville

Seasonal solar PV output for Latitude: 36.8646, Longitude: -83.886 (Barbourville, 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 32° South in Barbourville, United States

To maximize your solar PV system's energy output in Barbourville, United States (Lat/Long 36.8646, -83.886) throughout the year, you should tilt your panels at an angle of 32° 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 Barbourville, 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 Barbourville, United States. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 32° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
20° South in Summer	42° South in Autumn	52° South in Winter	30° 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 Barbourville, 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 Barbourville, 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 Barbourville, United States

Topographical Features of Barbourville

Barbourville sits in the heart of southeastern Kentucky's Appalachian region, where the landscape is characterized by rolling hills, narrow valleys, and forested ridgelines. The town itself is positioned at approximately 1,200 feet above sea level in a valley carved by the Cumberland River, which flows northward through the area. The surrounding terrain rises dramatically in all directions, with ridges and peaks extending upward to elevations exceeding 2,000 feet. The topography here reflects the classic Appalachian pattern of parallel ridges and valleys running generally northeast to southwest. These ridges are separated by narrow hollows and creek beds that drain into the Cumberland River system. The slopes are typically steep, often ranging from 15 to 30 degrees, and are heavily forested with mixed hardwoods and some pine stands. Rock outcroppings are common along the ridgetops, where sandstone and limestone formations create natural barriers.

Valley Floor Characteristics

The valley floor around Barbourville represents the most level terrain in the immediate area, though even these relatively flat areas show gentle undulations. Much of this lower elevation land has been cleared for agriculture, residential development, and commercial use. The Cumberland River meanders through this valley, creating some wetland areas and flood-prone zones that would be unsuitable for large infrastructure projects. Agricultural fields in the valley tend to be small and irregularly shaped due to the constraints imposed by the surrounding hills and the river's path. These cleared areas offer some of the best visibility to the sky, though they may still experience seasonal shading from the higher ridges during winter months when the sun angle is lower.

Optimal Areas for Large-Scale Solar Development

The most promising locations for large-scale solar photovoltaic installations would be found on the broader ridgetops and upper slopes that face south or southwest. These elevated positions benefit from maximum exposure to sunlight throughout the day and experience minimal shading from adjacent terrain features. The ridges running parallel to the valley system often provide extended linear areas that could accommodate substantial solar arrays. Cleared agricultural land on gentle slopes with southern exposure would represent another prime opportunity for solar development. These areas combine relatively level terrain with good solar access, while potentially offering easier construction access than remote ridgetop locations. Former strip mining areas, which exist in parts of the broader region, can also provide large, cleared spaces with minimal vegetation that require clearing.

Geographic Challenges for Solar Installation

The steep terrain that dominates much of the landscape around Barbourville presents significant challenges for large-scale solar development. Many slopes are too steep for conventional ground-mounted solar systems and would require extensive grading or specialized mounting systems. The heavily forested nature of most ridges and slopes would necessitate substantial clearing operations, which could face environmental restrictions and add considerable cost to any project. Access to many potentially suitable sites remains limited due to the rugged terrain and sparse road network in the more remote areas. The narrow valleys and winding roads that characterize the region could complicate the transportation of large equipment and materials needed for solar installation. Additionally, the fractured land ownership patterns typical of Appalachian regions might require negotiations with multiple property owners to assemble sites large enough for utility-scale solar projects.

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.