Solar PV Analysis of Willis, United States
Willis, Texas, located in the Northern Sub Tropics, offers a generally favorable environment for solar energy production throughout the year. The location's latitude and longitude (30.439, -95.5384) provide ample sunlight for photovoltaic (PV) systems, though output varies significantly across seasons.
Seasonal Solar Performance
Solar energy generation in Willis peaks during the summer months, with an impressive daily output of 6.57 kWh per kW of installed solar capacity. Spring follows as the second-most productive season, yielding 5.22 kWh/day. Autumn sees a slight decrease to 4.93 kWh/day, while winter experiences the lowest output at 3.14 kWh/day per kW installed.
The substantial difference between summer and winter production highlights the impact of seasonal variations on solar energy generation in this region. However, even during the least productive winter months, the system still generates a meaningful amount of electricity.
Optimal Panel Installation
For fixed-panel installations in Willis, the ideal tilt angle to maximize year-round solar production is 27 degrees facing South. This angle optimizes the panels' exposure to sunlight throughout the year, accounting for the Earth's elliptical orbit and the location's specific latitude.
Environmental Considerations
While Willis generally provides favorable conditions for solar energy production, there are a few environmental factors to consider:
- Humidity: The sub-tropical climate can lead to high humidity levels, potentially affecting panel efficiency. Regular cleaning may be necessary to prevent moisture-related issues.
- Storms: The region can experience severe thunderstorms and occasional hurricanes. Robust mounting systems and high-quality, weather-resistant panels are crucial for long-term reliability.
To mitigate these factors, consider installing panels with anti-reflective and hydrophobic coatings to reduce the impact of humidity and improve performance in varying weather conditions. Additionally, ensure proper drainage systems are in place to prevent water accumulation on or around the panels.
Overall, Willis, Texas provides a suitable location for solar PV installations, with strong potential for energy generation throughout the year, particularly from spring through autumn. With appropriate system design and preventative measures, solar energy can be a reliable and efficient power source in this area.
Note: The Northern Sub Tropics extend from 23.5° latitude North up to 35° 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 Willis
Seasonal solar PV output for Latitude: 30.439, Longitude: -95.5384 (Willis, 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 27° South in Willis, United States
To maximize your solar PV system's energy output in Willis, United States (Lat/Long 30.439, -95.5384) throughout the year, you should tilt your panels at an angle of 27° 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 Willis, 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 Willis, United States. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 27° South tilt angle throughout the year.
| Overall Best Summer Angle | Overall Best Autumn Angle | Overall Best Winter Angle | Overall Best Spring Angle |
|---|---|---|---|
| 14° South in Summer | 35° South in Autumn | 46° South in Winter | 24° 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 Willis, 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 Willis, United States.
Our calculation method
- Solar Position:
We determine the Sun's position on the Winter solstice using the location's latitude and solar declination. - Shadow Projection:
We calculate the shadow length cast by panels using trigonometry, considering panel tilt and the Sun's elevation angle. - 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 Willis, United States
The area around Willis, Texas in the United States has a gently rolling topography typical of the East Texas Piney Woods region. The landscape is characterized by low hills and shallow valleys, with elevations generally ranging from about 300 to 400 feet above sea level. The terrain is not particularly steep or rugged, but it does have a subtle undulating quality.
The region is heavily forested, primarily with pine trees interspersed with hardwoods like oak and hickory. These woodlands are broken up by cleared areas for pastures, small farms, and residential developments. Numerous small streams and creeks crisscross the area, eventually feeding into larger water bodies like Lake Conroe, which lies just to the southwest of Willis.
In terms of suitability for large-scale solar PV (photovoltaic) installations, the immediate vicinity of Willis presents some challenges. The abundant tree cover and relatively small open spaces would require significant land clearing, which could be both costly and environmentally disruptive. Additionally, the gently rolling terrain might necessitate some grading to create large, flat areas optimal for solar panel placement.
However, moving slightly further from Willis, there are areas that could be more suitable for solar PV projects. To the west and northwest of Willis, as you approach the eastern edges of the Texas Hill Country, there are larger expanses of open land with less forest cover. These areas, while still having some topographical variation, tend to have more extensive flat or gently sloping spaces that could accommodate large solar arrays without requiring as much land preparation.
Another potential area for solar development might be found to the southeast of Willis, as the landscape transitions towards the coastal plains. This region generally becomes flatter and more open, with larger agricultural fields and prairies that could be repurposed for solar energy production. The proximity to major urban centers like Houston could also make power transmission more efficient from these locations.
It's important to note that while topography is a crucial factor in siting solar PV installations, other considerations such as local zoning laws, grid connectivity, and environmental impact assessments would also play significant roles in determining the most suitable locations for large-scale solar projects in the region around Willis.
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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Article Details for Citation
Author: Aaron Robinson
Publisher: profileSOLAR.com
First Published: Thursday 26th of September 2024
Last Updated: Monday 21st of July 2025
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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.
