Millbrook, Alabama, located in the Northern Sub Tropics at coordinates 32.4799, -86.3619, offers reasonably good conditions for year-round solar energy generation, though with notable seasonal variations that potential solar installers should understand.
Seasonal Solar Performance
The location shows strong solar production during warmer months, with both summer and spring delivering excellent output at 6.16 kWh per day per kW of installed solar capacity. This represents peak performance periods when solar panels will generate maximum electricity. Autumn performance drops to a moderate 4.61 kWh per day per kW, which still provides decent energy generation. However, winter months present the biggest challenge, with production falling significantly to just 2.91 kWh per day per kW of installed capacity. The ideal times for solar generation at this Millbrook location are clearly spring and summer, when the sun's path and intensity combine to deliver optimal conditions. The substantial drop-off in winter production means homeowners and businesses should plan for reduced solar output during these months.Optimal Panel Installation
For fixed panel installations at this location, the ideal angle to tilt panels for maximum total year-round production is 28 degrees facing south. This angle maximizes solar collection throughout the year by accounting for the sun's changing position across seasons.Local Factors Affecting Solar Production
Several environmental and weather factors in the Millbrook area can impact solar panel performance:- High humidity and frequent thunderstorms during summer months can reduce solar efficiency and create temporary production interruptions
- Severe weather events including tornadoes and hail storms pose risks to panel integrity
- Heavy tree coverage common in Alabama can create shading issues
- Dust and pollen accumulation, particularly during spring months, can coat panels and reduce output
Preventative Measures for Better Performance
To maximize solar energy production despite these challenges, several installation strategies prove effective:- Install panels with proper drainage systems and secure mounting to handle heavy rain and wind
- Choose impact-resistant panels and consider protective barriers in hail-prone areas
- Conduct thorough site surveys to identify and trim problematic tree branches before installation
- Implement regular cleaning schedules, especially during high pollen seasons
- Install monitoring systems to quickly identify performance drops from weather-related issues
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 Millbrook
Seasonal solar PV output for Latitude: 32.4799, Longitude: -86.3619 (Millbrook, 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 28° South in Millbrook, United States
To maximize your solar PV system's energy output in Millbrook, United States (Lat/Long 32.4799, -86.3619) throughout the year, you should tilt your panels at an angle of 28° 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 Millbrook, 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 Millbrook, United States. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 28° South tilt angle throughout the year.
| Overall Best Summer Angle | Overall Best Autumn Angle | Overall Best Winter Angle | Overall Best Spring Angle |
|---|---|---|---|
| 16° South in Summer | 38° South in Autumn | 47° South in Winter | 25° 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 Millbrook, 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 Millbrook, 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 Millbrook, United States
Topographical Features Around Millbrook
The area surrounding Millbrook in central Alabama is characterized by gently rolling hills and relatively modest elevation changes typical of the Piedmont region. The landscape consists of undulating terrain with elevations generally ranging from 200 to 400 feet above sea level, creating a series of low ridges and shallow valleys that extend across the region. This topography represents the transition zone between the Appalachian foothills to the north and the flatter coastal plain to the south. The terrain around Millbrook features a mix of forested hills, agricultural fields, and developed areas, with the Coosa River system providing the primary drainage for the region. The rolling nature of the landscape means that while there are no dramatic elevation changes, the land rarely remains completely flat for extended distances. Small creeks and tributaries have carved gentle valleys through the area, creating a varied but manageable topographical environment.Optimal Areas for Large-Scale Solar Development
The most suitable locations for large-scale solar photovoltaic installations in the Millbrook vicinity would be the broader ridge tops and gently sloping hillsides that face south or southwest. These elevated areas typically offer the best combination of solar exposure and relatively stable ground conditions while avoiding the seasonal flooding risks associated with lower-lying areas near waterways. The agricultural fields scattered throughout the region present excellent opportunities for solar development, particularly those located on the higher, well-drained soils that characterize the ridge systems. These areas often have the additional advantage of existing road access and electrical infrastructure, which can significantly reduce development costs. Areas to avoid for large-scale solar installations include the steeper slopes found along creek beds and river valleys, where erosion concerns and challenging construction conditions would increase project complexity. The lower elevations near the Coosa River and its tributaries also present potential flooding risks that make them less suitable for permanent solar infrastructure. The cleared agricultural land on gentle slopes with southern exposure represents the ideal compromise between topographical suitability, land availability, and infrastructure access. These locations provide stable foundations for solar arrays while maintaining reasonable construction and maintenance access across the gently rolling terrain that defines this part of central Alabama.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!
Citation Guide
Article Details for Citation
Author: Aaron Robinson
Publisher: profileSOLAR.com
First Published: Tuesday 22nd of July 2025
Last Updated: Thursday 7th of August 2025
Tell Us About Your Work
We love seeing how our research helps others! If you've cited this article in your work, we'd be delighted to hear about it. Drop us a line via our Contact Us page or on X, to share where you've used our information - we may feature a link to your work on our site. This helps create a network of valuable resources for others in the solar energy community and helps us understand how our research is contributing to the field. Plus, we occasionally highlight exceptional works that reference our research on our social media channels.
Feeling generous?
Share this with your friends!

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.




