Forest Park, Illinois presents a moderately favorable location for solar energy generation, though it experiences significant seasonal variation typical of the Northern Temperate Zone. The location's solar production potential varies considerably throughout the year, with peak performance during summer months and substantially reduced output during winter.

Seasonal Solar Performance

Summer represents the optimal season for solar energy generation at this location, producing 6.25 kWh per day per kW of installed capacity. This peak performance period offers nearly three times the energy output compared to winter months. Spring follows as the second-best season with 5.26 kWh per day per kW, making it another highly productive period for solar installations. Autumn production drops to 3.32 kWh per day per kW, while winter presents the most challenging conditions with only 2.01 kWh per day per kW. This dramatic seasonal swing means that solar systems will generate approximately 68% less energy during winter compared to summer peak production.

Optimal Panel Configuration

For maximum year-round energy production at Forest Park, solar panels should be installed at a fixed tilt angle of 36 degrees facing south. This angle has been calculated to optimize total annual output by accounting for the sun's changing position throughout the year and weighting the angles based on actual solar irradiance data for this latitude.

Environmental and Weather Challenges

Several local factors can significantly impact solar energy production in Forest Park, Illinois:

• Heavy snow accumulation during winter months can completely block solar panels
• Ice formation creates both shading and potential structural stress on panel systems
• Frequent cloud cover and overcast skies, particularly during autumn and winter
• High humidity levels that can reduce solar irradiance
• Severe weather events including hail, strong winds, and thunderstorms

Preventative Installation Measures

To maximize energy production despite these challenges, several installation strategies should be considered:

• Install panels at the recommended 36-degree tilt to promote natural snow shedding
• Use mounting systems designed for high wind and snow loads typical of Illinois weather
• Ensure adequate spacing between panel rows to prevent snow accumulation and shading
• Select panels with anti-reflective coatings that perform better in diffuse light conditions
• Install micro-inverters or power optimizers to minimize production losses from partial shading
• Plan for regular winter maintenance access to remove snow when necessary

The steeper tilt angle not only optimizes annual production but also helps panels shed snow more effectively during winter months. Proper system design and component selection can help mitigate many of the environmental challenges present at this location, ensuring more consistent energy 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 Forest Park, Illinois

Seasonal solar PV output for Latitude: 41.8734, Longitude: -87.8107 (Forest Park, Illinois, 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 36° South in Forest Park, Illinois, United States

To maximize your solar PV system's energy output in Forest Park, Illinois, United States (Lat/Long 41.8734, -87.8107) throughout the year, you should tilt your panels at an angle of 36° 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 Forest Park, Illinois, 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 Forest Park, Illinois, United States. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 36° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
26° South in Summer	45° South in Autumn	56° South in Winter	35° 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 Forest Park, Illinois, 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 Forest Park, Illinois, United States.

Our calculation method

1. Solar Position:
   We determine the Sun's position on the Winter solstice using the location's latitude and solar declination.
2. Shadow Projection:
   We calculate the shadow length cast by panels using trigonometry, considering panel tilt and the Sun's elevation angle.
3. 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 Forest Park, Illinois, United States

Topography Around Forest Park

Forest Park sits in the western suburbs of Chicago, Illinois, positioned within the relatively flat terrain characteristic of the Great Lakes region. The area lies within the Chicago Plain, a glacially-formed landscape that extends across much of northeastern Illinois. This region was shaped by ancient glacial activity, resulting in generally level ground with only subtle elevation changes across the broader metropolitan area. The immediate vicinity around Forest Park features minimal topographic variation, with elevations typically ranging between 600 and 700 feet above sea level. The landscape consists primarily of gentle, rolling terrain with occasional slight depressions and low ridges left behind by retreating glaciers thousands of years ago. Small creeks and drainage channels meander through the area, creating minor valleys that are barely perceptible in the overall flat character of the region. Moving outward from Forest Park, the topography remains consistently level across Cook County and into the surrounding counties. The Des Plaines River flows roughly north to south several miles to the west, creating a shallow river valley that represents one of the more noticeable topographic features in the broader area. To the east, the terrain gradually slopes toward Lake Michigan, though this change in elevation occurs over many miles and remains quite gradual.

Optimal Areas for Large-Scale Solar Development

The relatively flat topography surrounding Forest Park creates favorable conditions for large-scale solar photovoltaic installations across much of the region. The most suitable areas would be found in the agricultural lands and open spaces that extend westward and southward from the immediate suburban developments. Areas approximately 10 to 20 miles southwest of Forest Park, particularly in Will County and parts of DuPage County, offer excellent potential for solar development. These locations feature extensive flat agricultural fields with minimal tree cover and few topographic obstacles. The level terrain eliminates concerns about shading from hills or ridges and allows for optimal panel orientation without the need for extensive site preparation or grading. The farmlands stretching westward into Kane County also present strong opportunities for solar installations. These areas benefit from the same glacially-flattened landscape while being positioned far enough from dense urban development to offer large contiguous parcels suitable for utility-scale projects. The open agricultural character of these lands means fewer existing structures or mature tree lines that could create shading issues. Areas to the northwest, particularly in parts of Cook County and Lake County that transition from suburban to rural land use, could also accommodate solar development. However, these locations may face more challenges related to existing infrastructure and higher land values due to their proximity to established residential areas. The flat prairie landscape that dominates this entire region of Illinois creates inherently favorable conditions for solar panel installation, as it minimizes the complexity and cost associated with site preparation while maximizing the potential for consistent solar exposure across large installation areas.

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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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.