Solar Energy Potential in Johnston, Iowa

Johnston, Iowa, located in the Northern Temperate Zone, offers a moderate potential for solar energy generation throughout the year. The city experiences significant seasonal variations in solar output, which impacts the overall effectiveness of solar PV systems.

Seasonal Solar Performance

Summer stands out as the most productive season for solar energy in Johnston, with an impressive daily output of 6.82 kWh per kW of installed solar capacity. Spring follows as the second-best season, generating 5.29 kWh per day. These seasons provide ideal conditions for maximizing solar energy production. Autumn sees a notable decrease in solar output, with 3.69 kWh per day. Winter presents the greatest challenge, with daily production dropping to 2.58 kWh. This significant seasonal variation highlights the importance of proper system sizing to ensure adequate energy supply throughout the year.

Optimal Panel Installation

For fixed panel installations in Johnston, the ideal tilt angle to maximize year-round solar production is 36 degrees facing South. This angle optimizes the panels' exposure to sunlight across all seasons, balancing the high summer sun with the lower winter sun angle.

Environmental Considerations

While Johnston's location is generally favorable for solar energy, there are some environmental factors to consider: 1. Snow accumulation: Iowa's winters can bring significant snowfall, which may temporarily reduce solar panel efficiency. To mitigate this: - Install panels at a steeper angle to encourage snow sliding off - Use snow-shedding coatings on panels - Implement a regular snow removal maintenance plan 2. Cloud cover: The region experiences partly cloudy conditions throughout the year. To address this: - Opt for high-efficiency panels that perform well in diffuse light conditions - Consider microinverters or power optimizers to minimize the impact of partial shading 3. Severe weather: Occasional severe storms, including hail, can pose a risk to solar installations. Preventative measures include: - Selecting impact-resistant solar panels - Installing protective covers or retractable systems for extreme weather events By addressing these factors during the planning and installation phases, solar energy systems in Johnston can achieve optimal performance and longevity, making the most of the available solar resources 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 Johnston

Seasonal solar PV output for Latitude: 41.675, Longitude: -93.7016 (Johnston, 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 Johnston, United States

To maximize your solar PV system's energy output in Johnston, United States (Lat/Long 41.675, -93.7016) 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 Johnston, 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 Johnston, 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	46° South in Autumn	56° 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 Johnston, 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 Johnston, 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 Johnston, United States

Johnston, United States, located at latitude 41.675 and longitude -93.7016, is situated in central Iowa, just northwest of the state capital, Des Moines. The topography of this area is characterized by gently rolling hills and prairie landscapes, typical of the Midwest region. The terrain is relatively flat to slightly undulating, with subtle changes in elevation throughout the area. The land around Johnston is primarily composed of fertile soil, which has been extensively cultivated for agriculture. The area features a mix of open fields, scattered woodlands, and numerous creeks and small streams that wind through the landscape. These waterways have carved shallow valleys and created minor variations in the otherwise mostly level terrain.

Suitable Areas for Large-Scale Solar PV

When considering locations for large-scale solar photovoltaic (PV) installations near Johnston, several factors come into play. The most suitable areas would be those with ample open space, minimal shading, and relatively flat terrain. Given the topography of the region, there are numerous potential sites that could accommodate solar farms. The agricultural lands surrounding Johnston present promising opportunities for solar development. Many of these areas feature expansive, unobstructed fields that receive abundant sunlight throughout the day. The gentle slopes in some locations can actually be advantageous for solar panel placement, as they can be oriented to maximize sun exposure. Areas to the north and west of Johnston may be particularly well-suited for solar PV installations. These regions tend to have larger tracts of open land with fewer urban developments, reducing potential conflicts with residential or commercial zones. Additionally, the slightly higher elevations in these directions could provide better solar exposure and reduced risk of shading from nearby structures or natural features. It's important to note that while the topography around Johnston is generally favorable for solar development, site-specific assessments would be necessary to determine the most optimal locations. Factors such as local zoning regulations, proximity to electrical infrastructure, and environmental considerations would also play crucial roles in selecting suitable sites for large-scale solar PV projects in the area.

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.