Holmen, Wisconsin, located in the Northern Temperate Zone, presents a moderately favorable location for year-round solar energy generation, though with significant seasonal variations that are typical for northern climates.

Seasonal Solar Performance

The solar energy output at this location shows dramatic seasonal swings. Summer provides the strongest performance at 6.52 kWh per day per kW of installed capacity, making it an excellent time for solar generation. Spring follows as the second-best season with 5.04 kWh per day per kW, offering strong energy production as daylight hours increase and the sun climbs higher in the sky. Autumn sees a notable decline to 3.36 kWh per day per kW as the sun angle decreases and weather patterns shift. Winter presents the most challenging conditions with only 2.29 kWh per day per kW, representing about 35% of summer production levels.

Optimal Panel Installation

For fixed panel installations at this Holmen location, the ideal tilt angle is 38 degrees facing south to maximize total year-round solar production. This angle is calculated to capture the most solar energy across all seasons by accounting for the sun's changing position throughout the year and weighting for actual solar irradiance data.

Local Factors Affecting Solar Production

Several environmental and weather factors in the Holmen area can significantly impact solar energy production:

• Snow accumulation: Wisconsin winters bring substantial snowfall that can completely block solar panels for days or weeks
• Ice formation: Freezing rain and ice storms can coat panels, severely reducing efficiency
• Cloud cover: The region experiences frequent overcast conditions, particularly in winter months
• Temperature effects: While cold temperatures can actually improve panel efficiency, extreme cold can affect system components

Preventative Measures for Better Performance

Several installation strategies can help maximize solar production despite these challenges:

• Steeper tilt angles: Installing panels at angles steeper than the optimal 38 degrees can help snow slide off more easily
• Anti-reflective coatings: Special panel coatings can reduce ice formation and make snow removal easier
• Proper spacing: Adequate spacing between panel rows prevents snow from one row shadowing another
• Cold-weather components: Using inverters and wiring rated for extreme temperatures ensures reliable operation
• Easy access design: Installing panels where they can be safely cleared of snow when necessary

Despite these seasonal challenges, Holmen's location still offers reasonable solar potential, particularly during the warmer months when energy demand for air conditioning typically peaks. The key to success lies in proper system design that accounts for local winter conditions while maximizing the excellent summer and spring solar resource.

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 Holmen

Seasonal solar PV output for Latitude: 43.9633, Longitude: -91.2562 (Holmen, 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 38° South in Holmen, United States

To maximize your solar PV system's energy output in Holmen, United States (Lat/Long 43.9633, -91.2562) throughout the year, you should tilt your panels at an angle of 38° 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 Holmen, 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 Holmen, United States. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 38° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
27° South in Summer	48° South in Autumn	58° South in Winter	37° 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 Holmen, 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 Holmen, 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 Holmen, United States

Topographical Features Around Holmen

The area surrounding Holmen, Wisconsin sits within the distinctive Driftless Area, a unique geological region that escaped glaciation during the last ice age. This landscape is characterized by rolling hills, deep valleys, and steep-sided coulees carved by ancient rivers and streams. The topography features a complex network of ridges and valleys that create a varied elevation profile across the region.

The Mississippi River flows along the western edge of the area, creating broad floodplains and terraces at lower elevations. Moving eastward from the river, the terrain rises through a series of bluffs and ridgetops that can reach several hundred feet above the valley floors. These ridges often run in north-south orientations, with numerous tributary valleys cutting through the landscape in east-west directions.

The soil composition varies significantly across this terrain, with sandy and loamy soils dominating the higher elevations and ridgetops, while the valley bottoms contain richer alluvial deposits. The natural vegetation includes a mix of prairie grasslands on the upland areas and hardwood forests in the valleys and on north-facing slopes.

Optimal Areas for Large-Scale Solar Development

The most suitable locations for large-scale solar photovoltaic installations in the Holmen area would be the relatively flat to gently rolling upland areas and ridgetops. These elevated positions offer several advantages for solar development, including consistent southern exposure without significant shading from adjacent terrain features. The ridgetops and plateau areas provide the most stable and accessible terrain for large solar arrays.

Agricultural areas on the gentler slopes and terraces near the Mississippi River also present good opportunities for solar development. These locations typically have been cleared of trees and offer relatively flat terrain that can accommodate extensive solar installations. The existing agricultural infrastructure in these areas often provides good access roads and electrical grid connections that would support solar development.

Areas to avoid for large-scale solar installations include the steep-sided coulees and heavily forested valley bottoms, where terrain challenges and shading from surrounding hills would significantly impact system performance. The north-facing slopes throughout the region would also be less suitable due to reduced solar exposure. Additionally, the immediate floodplain areas along the Mississippi River and its tributaries should be avoided due to potential flooding risks and environmental restrictions.

The transition zones between agricultural land and forested areas often provide good compromise locations, where terrain is manageable but environmental impact can be minimized. These areas frequently offer adequate space for utility-scale installations while maintaining reasonable access to existing electrical infrastructure.

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.