Aldan, Pennsylvania is a moderately good location for year-round solar energy generation, though it experiences significant seasonal variation typical of the Northern Temperate Zone climate.
Seasonal Solar Performance
The solar energy output at this location varies considerably throughout the year. Summer provides the highest production at 6.45 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 5.57 kWh per day per kW, offering nearly as much solar potential as summer. Autumn sees a notable drop in solar production to 3.71 kWh per day per kW, while winter represents the most challenging season with only 2.25 kWh per day per kW. This winter output is less than half of the spring production and roughly one-third of summer's peak performance. For optimal year-round energy production from a fixed solar panel installation at this location, panels should be tilted at 34 degrees facing south. This angle maximizes total annual solar output by accounting for the sun's changing position throughout the seasons.Environmental and Weather Factors
Several local factors in the Aldan area can significantly impact solar energy production and should be considered during installation planning. Snow accumulation during winter months can completely block solar panels, eliminating energy production until the snow melts or is removed. Pennsylvania typically experiences moderate to heavy snowfall, making this a serious concern for solar installations in the region. The area's humid continental climate brings frequent cloud cover, particularly during autumn and winter months, which reduces solar irradiance and energy output. Additionally, the region experiences occasional severe weather including thunderstorms, high winds, and ice storms that can damage solar equipment or create temporary shading from storm debris.Preventative Measures for Better Performance
Several installation strategies can help maximize solar energy production despite these environmental challenges:- Install panels at the optimal 34-degree tilt angle, which not only maximizes annual output but also helps snow slide off more easily
- Ensure adequate spacing between panel rows to prevent snow buildup and allow for safe snow removal access
- Use mounting systems rated for local wind and snow loads to prevent weather damage
- Position panels away from trees or structures that could drop debris during storms
- Consider installing a monitoring system to quickly identify performance issues caused by weather
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 Aldan
Seasonal solar PV output for Latitude: 39.9217, Longitude: -75.287 (Aldan, 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 34° South in Aldan, United States
To maximize your solar PV system's energy output in Aldan, United States (Lat/Long 39.9217, -75.287) throughout the year, you should tilt your panels at an angle of 34° 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 Aldan, 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 Aldan, United States. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 34° South tilt angle throughout the year.
| Overall Best Summer Angle | Overall Best Autumn Angle | Overall Best Winter Angle | Overall Best Spring Angle |
|---|---|---|---|
| 23° South in Summer | 44° South in Autumn | 55° South in Winter | 33° 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 Aldan, 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 Aldan, 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 Aldan, United States
Topographical Features Around Aldan
The area surrounding Aldan, located in southeastern Pennsylvania near Philadelphia, is characterized by gently rolling terrain typical of the Mid-Atlantic Piedmont region. This landscape features low hills and broad valleys with relatively modest elevation changes, creating a topography that is neither mountainous nor completely flat. The region sits at a moderate elevation, with the surrounding countryside displaying the characteristic undulating patterns formed by ancient geological processes that shaped much of southeastern Pennsylvania. The immediate vicinity consists of suburban developments interspersed with patches of woodland and open spaces. Small streams and tributaries flow through the area, creating minor valleys and drainage patterns that add subtle variation to the landscape. The terrain generally slopes in a southwestern direction toward the Delaware River, though the gradient is gradual and not immediately noticeable to casual observers.Geological and Environmental Context
The underlying geology consists primarily of metamorphic rocks and sedimentary formations that have been weathered over millions of years. This has resulted in well-drained soils and stable ground conditions that are generally favorable for construction and development. The area experiences a typical temperate climate with four distinct seasons, and the relatively open nature of much of the surrounding landscape means that solar exposure is generally unobstructed by major topographical features. Vegetation in the region includes a mix of deciduous and evergreen trees, though much of the original forest cover has been cleared for residential and commercial development. The remaining wooded areas tend to be concentrated in stream valleys and on steeper slopes that were less suitable for building.Optimal Areas for Large-Scale Solar Development
The most suitable locations for large-scale solar photovoltaic installations in the Aldan area would be the broader, flatter expanses found to the south and west of the community. These areas offer several advantages including relatively level ground that would minimize grading and construction costs, good accessibility via existing road networks, and sufficient open space to accommodate large arrays without significant tree removal. Agricultural fields and former farmland in the surrounding townships present particularly attractive opportunities for solar development. These areas typically have already been cleared of trees, have established access routes, and often feature the kind of gentle, south-facing slopes that are ideal for solar panel orientation. The stable soil conditions in these locations would provide solid foundations for mounting systems. Areas near existing electrical infrastructure would be especially advantageous, as they would reduce the costs and complexity of connecting solar installations to the power grid. The proximity to Philadelphia and its suburbs means that electrical transmission lines are generally well-developed throughout the region. Industrial and commercial zones on the outskirts of nearby communities could also provide suitable sites, particularly where large, flat parcels are available. These locations often have the additional benefit of being already zoned for utility-scale projects, potentially simplifying the permitting process. The relatively low population density in rural areas surrounding Aldan, combined with the gentle topography, creates favorable conditions for solar development with minimal impact on existing residential communities. The absence of significant mountains or other major geographical barriers means that most locations would receive adequate solar exposure throughout the day.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 15th of July 2025
Last Updated: Wednesday 6th of August 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.
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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.




