Millsboro, Delaware in the United States offers varying potential for solar PV energy generation throughout the year. Located in the Northern Temperate Zone, this specific location experiences significant seasonal fluctuations in solar energy production.
Seasonal Solar Production
Solar panels at this Millsboro location produce their highest output during summer months, generating about 6.56kWh per day for each kilowatt of installed capacity. Spring follows closely with 5.85kWh/day per installed kilowatt. Production drops considerably in autumn to 3.97kWh/day, with winter showing the lowest generation at just 2.38kWh/day per kilowatt installed.
This seasonal pattern means Millsboro residents can expect approximately 2.75 times more solar energy production in summer compared to winter months. The substantial spring production makes this an excellent secondary period for solar generation, while autumn represents a transition toward lower production levels.
Optimal Panel Installation
For fixed solar panel installations in Millsboro, the ideal tilt angle to maximize year-round energy production is 33 degrees facing South. This carefully calculated angle balances seasonal solar variations to optimize annual energy harvest.
Environmental and Weather Considerations
Several factors could potentially impact solar production in Millsboro:
- Coastal humidity and salt air exposure, which can accelerate corrosion of components if not properly protected
- Occasional Atlantic coastal storms and hurricanes that may bring high winds and flying debris
- Winter snow accumulation that can temporarily block panels during the already low-production winter months
- Tree coverage in some areas, particularly in this relatively forested region
To mitigate these challenges, solar installations should include corrosion-resistant components rated for coastal environments, secure mounting systems designed to withstand hurricane-force winds, and panels with self-cleaning capabilities. Installing panels at the recommended 33-degree tilt also helps with snow shedding. Regular maintenance, including cleaning and inspection, especially after major weather events, will help ensure optimal production throughout the year.
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 Millsboro
Seasonal solar PV output for Latitude: 38.5915, Longitude: -75.2913 (Millsboro, 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 33° South in Millsboro, United States
To maximize your solar PV system's energy output in Millsboro, United States (Lat/Long 38.5915, -75.2913) throughout the year, you should tilt your panels at an angle of 33° 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 Millsboro, 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 Millsboro, United States. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 33° South tilt angle throughout the year.
| Overall Best Summer Angle | Overall Best Autumn Angle | Overall Best Winter Angle | Overall Best Spring Angle |
|---|---|---|---|
| 22° South in Summer | 43° South in Autumn | 54° South in Winter | 31° 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 Millsboro, 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 Millsboro, 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 Millsboro, United States
The topography around Millsboro, Delaware is characterized by a predominantly flat coastal plain landscape. Located in Sussex County in southern Delaware, Millsboro sits at an elevation of approximately 20-30 feet above sea level. The terrain is part of the Atlantic Coastal Plain physiographic province, which features minimal elevation changes throughout the region.
Landscape Features
The area surrounding Millsboro consists primarily of low-lying flat lands with subtle undulations. The Indian River and its tributaries flow through the region, creating small valleys and wetland areas. These waterways have shaped the local topography over time, carving gentle depressions in the otherwise level terrain. To the east of Millsboro, the landscape transitions toward coastal marshes and eventually the Atlantic Ocean, approximately 8 miles away. The soil composition in this region consists mainly of sandy loams and silty sediments, typical of coastal plain environments. These soils were formed from marine and riverine deposits over geological time. The flat nature of the landscape means there are few significant hills or ridges that would cast shadows or create microclimates.Vegetation and Land Use
The natural vegetation around Millsboro includes mixed deciduous and pine forests, though much of the land has been cleared for agricultural use and development. Agricultural fields dominate the rural landscape, interspersed with small woodlots and residential areas. The relatively open character of the agricultural lands provides minimal topographical obstruction.Ideal Areas for Solar PV Development
For large-scale solar photovoltaic (PV) installations, the areas west and southwest of Millsboro offer particularly favorable conditions. These locations combine several advantageous characteristics: The agricultural lands west of Millsboro feature large, open fields with minimal slope, providing ideal conditions for solar array placement. The flat topography eliminates the need for extensive grading, reducing construction costs and environmental impact. These areas typically have good drainage characteristics, important for the long-term stability of solar installations. The land parcels in this direction tend to be larger, which is beneficial for achieving economies of scale in solar development. Additionally, these areas are generally set back from the coastal wetlands and flood-prone zones near the Indian River, reducing environmental complications and flood risks. Areas north of Millsboro also offer potential, though they may have slightly more varied topography and smaller field sizes. The eastern direction, toward the coast, becomes progressively less suitable due to increasing wetland areas, higher water tables, and potential coastal hazards. The flat topography throughout the region means that solar panels can be installed with consistent orientation and tilt angles across large areas, optimizing energy production. The minimal relief also reduces concerns about inter-row shading, allowing for more efficient use of available land area. In conclusion, the gentle, flat topography around Millsboro creates generally favorable conditions for solar PV development, with the western and southwestern agricultural lands offering particularly suitable sites for large-scale installations due to their combination of flat terrain, large field sizes, and relatively stable land conditions.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: Sunday 27th of April 2025
Last Updated: Friday 12th of September 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.




