Onarga, Illinois is a moderately suitable location for year-round solar energy generation, though like most locations in the Northern Temperate Zone, it experiences significant seasonal variation in solar production potential.

Seasonal Solar Performance

The solar energy output at this location varies considerably throughout the year. Summer provides the strongest solar generation at 6.33 kWh per day per kW of installed capacity, making it the ideal season for solar production. Spring follows as the second-best performing season with 5.34 kWh per day per kW, offering excellent solar potential as daylight hours increase and weather conditions improve. Autumn sees a notable decline in solar output to 3.45 kWh per day per kW as the sun angle decreases and weather patterns change. Winter presents the most challenging conditions for solar generation, producing only 2.32 kWh per day per kW, which is typical for northern temperate locations during the coldest months.

Optimal Panel Configuration

For maximum year-round solar energy production at Onarga, fixed solar panels should be tilted at 35 degrees facing south. This angle is calculated to optimize total annual output by accounting for the sun's changing position throughout the seasons and the varying solar irradiance levels at this latitude.

Local Factors Affecting Solar Production

Several environmental and weather factors in the Onarga area can impact solar panel performance and should be considered during installation:

• Snow accumulation: Illinois winters can bring significant snowfall that covers panels and blocks sunlight
• Ice formation: Freezing conditions can create ice buildup on panel surfaces
• Agricultural dust: Being in a rural farming area, dust from agricultural activities can accumulate on panels
• Severe weather: The region experiences thunderstorms, high winds, and occasional hail that could damage equipment
• Temperature fluctuations: Extreme temperature swings between seasons can stress panel materials and connections

Preventative Measures for Better Performance

To maximize solar energy production despite these challenges, several installation strategies can be employed: Install panels at the recommended 35-degree tilt angle, which naturally helps snow slide off more easily than flatter installations. Use high-quality mounting systems designed to withstand high wind loads and severe weather conditions typical of the Midwest. Consider installing panels with anti-reflective coatings and smooth surfaces that resist dust accumulation and make cleaning easier. Ensure adequate spacing between panel rows to prevent shading and allow for maintenance access. Plan for regular cleaning and maintenance schedules, particularly after dust storms or before peak production seasons. Install monitoring systems to quickly identify performance issues caused by weather or environmental factors. Use panels and inverters rated for the wide temperature ranges experienced in Illinois, and ensure all electrical connections are weatherproofed against moisture and temperature cycling. Consider micro-inverters or power optimizers to minimize the impact if individual panels are affected by shading or debris.

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 Onarga

Seasonal solar PV output for Latitude: 40.7083, Longitude: -87.9956 (Onarga, 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 Onarga, United States

To maximize your solar PV system's energy output in Onarga, United States (Lat/Long 40.7083, -87.9956) 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 Onarga, 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 Onarga, 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
25° South in Summer	44° South in Autumn	55° South in Winter	34° 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 Onarga, 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 Onarga, 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 Onarga, United States

Topography Around Onarga, Illinois

The topography surrounding Onarga, Illinois is characterized by gently rolling agricultural plains typical of east-central Illinois. This region sits within the Grand Prairie physiographic division, where the landscape was shaped by glacial activity during the last ice age. The terrain consists of relatively flat to gently undulating farmland with subtle elevation changes that rarely exceed 50 feet across several miles. The area features rich, dark prairie soils that have been extensively cultivated for corn and soybean production. Drainage patterns flow primarily toward the Iroquois River system, which meanders through the broader region in a generally northeastward direction. Small creeks and agricultural drainage ditches create minor topographical features, but these waterways typically occupy shallow valleys that don't significantly interrupt the overall flat character of the landscape. Elevation in the immediate vicinity of Onarga ranges from approximately 650 to 700 feet above sea level, with the highest points generally found on the broad, flat upland areas between stream valleys. These elevated areas represent the original prairie surface that once dominated this part of Illinois before agricultural development.

Optimal Areas for Large-Scale Solar Development

The expansive agricultural fields on the flat to gently rolling upland areas northeast and southwest of Onarga present the most favorable conditions for large-scale solar photovoltaic installations. These locations offer several key advantages including minimal grading requirements, excellent southern exposure potential, and sufficient space for extensive solar arrays without significant topographical constraints. The broad, elevated prairie remnants that extend toward the communities of Gilman and Watseka provide particularly suitable terrain. These areas feature consistent gentle slopes that can be easily accommodated in solar panel design while maintaining optimal orientation toward the sun. The relatively uniform elevation across these agricultural lands eliminates concerns about shadowing from significant topographical features. Areas closer to existing electrical transmission infrastructure would be especially advantageous for solar development. The flat agricultural land along major transportation corridors, including areas near State Route 24 and Interstate 57, combine favorable topography with proximity to existing utility infrastructure. These locations offer the dual benefits of suitable terrain and reduced costs for electrical interconnection. The consistent soil conditions and drainage patterns in these upland areas also support construction activities, as the well-drained prairie soils provide stable foundations for solar mounting systems. The absence of significant wetlands or steep slopes in most of the surrounding agricultural areas means that large contiguous parcels can be developed without major environmental or engineering obstacles.

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.