Coplay, Pennsylvania, located in the Northern Temperate Zone, offers varying potential for solar energy generation throughout the year. This location experiences significant seasonal fluctuations in solar productivity that prospective solar panel owners should consider.
Seasonal Solar Production
Solar panels in Coplay demonstrate substantial seasonal variation in energy output. Summer is the most productive season, generating 5.96 kWh per day for each kilowatt of installed capacity. Spring follows closely with 5.32 kWh/day per kW. Production drops considerably in autumn to 3.37 kWh/day, while winter sees the lowest output at just 2.11 kWh/day per kW installed.
This pattern means that Coplay residents can expect approximately 2.8 times more solar energy production in summer compared to winter months. The spring and summer seasons (roughly April through September) represent the prime solar generating period, accounting for significantly more energy than the autumn and winter months combined.
Optimal Panel Installation
For fixed solar panel installations in Coplay, the ideal tilt angle is 35 degrees facing South. This specific angle maximizes year-round energy production by optimizing the panels' exposure to the sun's changing position throughout the seasons. This calculated angle accounts for Coplay's latitude, the earth's elliptical orbit, and seasonal solar irradiance patterns.
Environmental Considerations
Several environmental factors could impact solar production in Coplay:
- Snow accumulation during Pennsylvania winters can temporarily reduce output, requiring occasional panel clearing or the installation of panels at steeper angles to promote snow sliding
- Tree coverage and building shadows common in suburban Pennsylvania settings may create partial shading issues, necessitating careful site assessment and potentially microinverters or power optimizers
- Moderate dust and pollen accumulation, particularly during spring in this temperate climate, may necessitate periodic cleaning
Preventative measures include scheduling seasonal maintenance, installing snow guards or heating elements in panel frames for winter conditions, and conducting thorough shade analysis before installation. Additionally, choosing high-efficiency panels can help maximize production during lower-output months.
Overall, while Coplay isn't ideal for year-round solar production due to its significant seasonal variation, proper system design can still yield satisfactory results, especially during the productive spring and summer months.
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 Coplay
Seasonal solar PV output for Latitude: 40.674, Longitude: -75.4872 (Coplay, 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 35° South in Coplay, United States
To maximize your solar PV system's energy output in Coplay, United States (Lat/Long 40.674, -75.4872) throughout the year, you should tilt your panels at an angle of 35° 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 Coplay, 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 Coplay, United States. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 35° South tilt angle throughout the year.
| Overall Best Summer Angle | Overall Best Autumn Angle | Overall Best Winter Angle | Overall Best Spring Angle |
|---|---|---|---|
| 24° South in Summer | 45° South in Autumn | 56° 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 Coplay, 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 Coplay, 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 Coplay, United States
The topography around Coplay, Pennsylvania presents a varied landscape characterized primarily by the gentle rolling hills of the Lehigh Valley. Situated approximately 40.674° north and 75.4872° west, Coplay sits along the western bank of the Lehigh River. This region forms part of the larger Ridge and Valley physiographic province, which extends throughout much of Pennsylvania. The immediate vicinity of Coplay features relatively flat terrain near the river, gradually rising into modest hills as one moves westward. The elevation in the town itself averages around 330 feet (100 meters) above sea level, while surrounding areas reach heights of 600-800 feet (180-240 meters) in the nearby ridges. The Lehigh River has played a significant role in shaping this landscape, carving a valley through the otherwise hilly terrain.
Surrounding Landforms
To the north and west of Coplay, the terrain becomes more pronounced with the foothills of the Appalachian Mountains beginning to emerge. The Blue Mountain ridge, part of the Kittatinny Ridge system, runs roughly east-west about 10 miles north of Coplay, creating a distinctive topographic feature visible from many parts of the Lehigh Valley. South of Coplay, the land gradually rises toward South Mountain, though this elevation change is less dramatic than the northern ridges. The eastern landscape is dominated by the Lehigh River valley, which provides a natural corridor through the otherwise undulating terrain.Potential Areas for Solar PV Development
For large-scale solar photovoltaic (PV) installations, several areas around Coplay offer favorable conditions based on topographic considerations. The most suitable locations would include: The gently sloping farmlands and open spaces southwest of Coplay, extending toward Allentown and Whitehall Township, present ideal conditions for solar development. These areas feature relatively flat to moderately sloping terrain with southern exposure, minimizing installation challenges while maximizing potential solar capture. Former industrial sites and brownfields in the broader Lehigh Valley, particularly those with large flat areas, represent prime opportunities for solar development. The region's industrial heritage has left numerous open spaces that could be repurposed for renewable energy generation without disrupting natural habitats or agricultural land. The modest south-facing slopes of the hills west of Coplay offer another potential zone for solar development. While these areas have more varied terrain, strategic placement of panels on south-facing aspects could potentially increase energy capture efficiency. Areas to avoid would include the steeper northern slopes of ridges, flood-prone areas near the Lehigh River, and heavily forested sections where clearing would be environmentally disruptive. The more pronounced hills and ridges north of Coplay would present installation challenges that might make large-scale solar development less economically viable. The overall topographic profile of the region provides a mix of opportunities and constraints for solar development, with the gentler southern and western exposures offering the most promise for large-scale installations.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: Friday 27th of June 2025
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.




