Saint Ann, Missouri, located in the Northern Temperate Zone, presents a moderately favorable location for year-round solar energy generation, though with significant seasonal variations that potential solar installers should carefully consider.

Seasonal Solar Performance

The location experiences substantial fluctuations in solar energy production throughout the year. Summer represents the peak production period, generating 6.50 kWh per day per kW of installed capacity. Spring follows as the second-best season with 5.30 kWh daily output, while autumn drops to 3.94 kWh per day. Winter presents the most challenging conditions, producing only 2.37 kWh daily per installed kW. This seasonal pattern means that summer and spring are the ideal times for solar generation at this Missouri location, accounting for approximately 65% of the year's optimal production periods. The dramatic drop in winter output - less than half of spring production - reflects the challenging solar conditions typical of the American Midwest during colder months.

Optimal Panel Configuration

For fixed panel installations at Saint Ann, the ideal tilt angle is 34 degrees facing south to maximize total year-round production. This angle is calculated based on the location's latitude and accounts for seasonal sun path variations throughout the year.

Environmental and Weather Challenges

Several significant local factors can impede solar production in Saint Ann, Missouri:

• Snow accumulation: Winter weather can cause snow to accumulate on panels, blocking sunlight and reducing already-limited winter production
• Ice formation: Freezing conditions may create ice buildup that persists longer than snow
• Severe weather: Missouri's location in Tornado Alley exposes installations to potential hail damage and high winds
• Humidity and storms: The region's continental climate brings frequent thunderstorms and high humidity levels that can affect equipment

Preventative Installation Measures

To maximize energy production despite these challenges, several installation strategies prove beneficial: Installing panels at the recommended 34-degree tilt helps snow and ice slide off more easily than flatter configurations. Selecting panels and mounting systems rated for high wind loads and hail impact protects against severe weather damage. Ensuring adequate spacing between panel rows prevents snow buildup from shading adjacent panels. Regular maintenance becomes particularly important during winter months, though the steep tilt angle naturally assists with self-cleaning. Choosing high-quality inverters and electrical components rated for temperature extremes helps maintain system efficiency during Missouri's hot summers and cold winters. The location's moderate solar potential, combined with proper installation techniques and equipment selection, can still provide reasonable year-round energy production for residential and commercial applications, though expectations should account for the significant winter production decline.

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 Saint Ann

Seasonal solar PV output for Latitude: 38.7199, Longitude: -90.3889 (Saint Ann, 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 34° South in Saint Ann, United States

To maximize your solar PV system's energy output in Saint Ann, United States (Lat/Long 38.7199, -90.3889) throughout the year, you should tilt your panels at an angle of 34° 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 Saint Ann, 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 Saint Ann, United States. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 34° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
23° South in Summer	43° South in Autumn	53° South in Winter	32° 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 Saint Ann, 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 Saint Ann, 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 Saint Ann, United States

Topographic Features of Saint Ann, Missouri

Saint Ann is located in the greater St. Louis metropolitan area of Missouri, positioned within the gently rolling landscape characteristic of the Central Lowlands physiographic province. The terrain around Saint Ann consists primarily of low hills and broad valleys that were shaped by ancient glacial activity and centuries of erosion from the nearby Missouri and Mississippi Rivers. The elevation in this region typically ranges from approximately 400 to 600 feet above sea level, creating a moderately undulating landscape with gentle slopes rather than steep inclines.

The area sits on what geologists call the St. Louis Plain, which features relatively stable bedrock composed mainly of limestone and sandstone formations. This underlying geology contributes to the region's generally well-drained soils and stable foundation conditions. The topography is punctuated by small creeks and tributaries that flow toward the major river systems, creating shallow valleys and drainage corridors throughout the landscape.

Most of the immediate vicinity around Saint Ann has been extensively developed for residential, commercial, and industrial purposes, being part of the densely populated St. Louis County. However, the broader regional topography extends into areas with more open land, including agricultural fields, former agricultural parcels, and undeveloped tracts that maintain the area's characteristic gentle rolling terrain.

Optimal Areas for Large-Scale Solar Development

The most suitable locations for large-scale solar photovoltaic installations in the Saint Ann vicinity would be found on the numerous south-facing slopes that characterize the rolling topography of the region. These gentle hillsides provide natural advantages for solar panel orientation while offering adequate drainage and stable ground conditions for mounting systems.

Former agricultural lands in the surrounding counties, particularly in western St. Louis County and adjacent St. Charles County, present excellent opportunities for solar development. These areas feature relatively flat to gently sloping terrain that has already been cleared of trees and prepared for large-scale land use. The existing agricultural infrastructure, including access roads and electrical connections, can often be adapted to support solar installations.

Industrial parks and brownfield sites in the region also offer promising locations for solar development. Many of these areas have been previously graded and prepared, eliminating the need for extensive site preparation. The proximity to existing electrical infrastructure and transmission lines makes these locations particularly attractive for connecting large solar arrays to the regional power grid.

Areas along the major transportation corridors, including land adjacent to Interstate 70 and other highways, provide additional opportunities for solar development. These locations often feature relatively flat terrain that was previously cleared for transportation infrastructure, and they benefit from excellent accessibility for construction and maintenance activities.

The key advantage of the Saint Ann region for solar development lies in its gentle topography, which minimizes the need for extensive grading or terracing while providing natural drainage patterns that help protect solar installations from water damage. The absence of significant elevation changes also reduces the complexity and cost of electrical infrastructure needed to connect solar arrays to the broader power grid.

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.