Ottumwa, Iowa, located in the United States at latitude 41.0191 and longitude -92.4218, presents a mixed picture for solar energy generation throughout the year. This Northern Temperate Zone location experiences significant seasonal variations in solar output, which impact the overall efficiency of photovoltaic (PV) systems.

Seasonal Solar Performance

Summer stands out as the most productive season for solar energy in Ottumwa, with an impressive daily output of 6.66 kWh per kW of installed solar capacity. Spring follows as the second-best season, generating 5.22 kWh/day. These warmer months offer longer daylight hours and more direct sunlight, making them ideal for solar energy production. Autumn sees a notable decrease in solar output, dropping to 3.67 kWh/day. Winter presents the biggest challenge, with production falling to just 2.69 kWh/day per kW installed. This significant seasonal variation highlights the importance of proper system sizing to ensure adequate energy supply throughout the year.

Optimizing Solar Panel Installation

To maximize year-round solar energy production in Ottumwa, fixed solar panels should be installed at a tilt angle of 36 degrees facing south. This optimal angle helps balance energy capture across seasons, particularly enhancing performance during the less productive autumn and winter months.

Environmental and Weather Considerations

Several factors can impact solar energy production in Ottumwa: 1. Snow accumulation in winter can temporarily reduce panel efficiency. Regular panel cleaning or the installation of panels at a steeper angle can help mitigate this issue. 2. Cloudy weather, particularly common in spring and fall, can decrease solar output. Using high-efficiency panels and incorporating energy storage solutions can help offset the impact of cloud cover. 3. High summer temperatures may slightly reduce panel efficiency. Ensuring proper ventilation behind the panels during installation can help manage this concern. To address these challenges, consider implementing a mix of strategies such as using snow-shedding panel frames, installing a ground-mounted system for easier maintenance, and incorporating micro-inverters or power optimizers to maximize performance under variable conditions. While Ottumwa's location presents some challenges for year-round solar energy production, proper system design and installation techniques can help maximize energy output and make solar a viable option for clean energy generation in this Iowa city.

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 Ottumwa

Seasonal solar PV output for Latitude: 41.0191, Longitude: -92.4218 (Ottumwa, 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 Ottumwa, United States

To maximize your solar PV system's energy output in Ottumwa, United States (Lat/Long 41.0191, -92.4218) 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 Ottumwa, 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 Ottumwa, 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
25° South in Summer	45° 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 Ottumwa, 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 Ottumwa, 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 Ottumwa, United States

The area surrounding Ottumwa, Iowa, in the United States, is characterized by a gently rolling landscape typical of the Midwest. This region, situated in southeastern Iowa, features a mix of low hills, shallow valleys, and flat plains. The Des Moines River, which flows through Ottumwa, has carved a broad valley that dominates the local topography. The terrain around Ottumwa is primarily composed of glacial till, deposited during the last ice age. This has resulted in fertile soils that support extensive agricultural activities. The landscape is dotted with farm fields, interspersed with patches of woodland and small streams that feed into the Des Moines River. To the north and south of Ottumwa, the land gradually rises into slightly more elevated areas, forming subtle ridges and plateaus. These higher grounds offer panoramic views of the surrounding countryside. However, the overall elevation change is modest, with most of the area lying between 600 and 900 feet above sea level.

Potential for Large-Scale Solar PV

When considering areas near Ottumwa for large-scale solar photovoltaic (PV) installations, several factors come into play. The most suitable locations would be: Flat or gently sloping farmland: The abundance of agricultural land in the region provides ample space for solar arrays. Areas with a slight south-facing slope would be ideal, as they receive more direct sunlight throughout the day. Former industrial or brownfield sites: Any unused industrial areas or remediated brownfields near Ottumwa could be repurposed for solar installations, making efficient use of land that might otherwise remain vacant. Areas with good road access: Locations near major roads or highways would facilitate the construction and maintenance of solar facilities. The proximity to Ottumwa's infrastructure could also aid in connecting the solar arrays to the existing power grid. Regions away from flood-prone areas: While the Des Moines River valley offers flat land, areas further from the river and its tributaries would be preferable to minimize the risk of flooding and potential damage to solar equipment. Open spaces with minimal shading: Locations with few trees or tall structures that could cast shadows on the solar panels would be most effective. The relatively open nature of much of the surrounding farmland makes this easier to achieve. It's important to note that while the topography around Ottumwa is generally favorable for solar PV installations, specific site assessments would be necessary to determine the most suitable locations. Factors such as local zoning laws, environmental considerations, and proximity to electrical infrastructure would also play crucial roles in selecting the best sites for large-scale solar projects.

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.