Rupert, Idaho, located in the Northern Temperate Zone, presents a mixed picture for solar PV energy generation throughout the year. This location experiences significant seasonal variations in solar output, which impacts the overall effectiveness of solar installations.

Seasonal Solar Performance

Summer stands out as the most productive season, with an impressive 7.59 kWh per day for each kW of installed solar capacity. Spring follows closely behind, generating 6.56 kWh/day. These seasons offer ideal conditions for solar energy production, with longer daylight hours and typically clearer skies.

Autumn sees a notable decrease in output, dropping to 4.02 kWh/day. The most challenging season is winter, where production plummets to just 2.12 kWh/day. This significant reduction is due to shorter days, lower sun angles, and potentially increased cloud cover.

Optimal Panel Positioning

To maximize year-round solar production in Rupert, fixed panels should be tilted at a 36-degree angle facing south. This angle is calculated to capture the most sunlight throughout the year, considering the location's latitude and seasonal sun paths.

Environmental Considerations

While Rupert's climate is generally favorable for solar energy, there are some factors that could impact production:

• Snow accumulation in winter can temporarily reduce panel efficiency
• Dust and agricultural particulates may settle on panels, especially during dry periods

To mitigate these issues, consider installing panels at a steeper angle to encourage snow slide-off and implement regular cleaning schedules. Additionally, investing in snow-removal tools and dust-resistant panel coatings can help maintain optimal performance.

Conclusion

While Rupert experiences significant seasonal variations in solar output, the location remains viable for solar PV installations. The strong performance during spring and summer can help offset the reduced winter production. With proper planning and maintenance, solar energy can be a valuable renewable resource for this Idaho community.

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 Rupert

Seasonal solar PV output for Latitude: 42.6191, Longitude: -113.6772 (Rupert, 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 Rupert, United States

To maximize your solar PV system's energy output in Rupert, United States (Lat/Long 42.6191, -113.6772) 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 Rupert, 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 Rupert, 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
26° South in Summer	46° South in Autumn	57° South in Winter	35° 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 Rupert, 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 Rupert, 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 Rupert, United States

The topography around Rupert, Idaho, in the United States is characterized by a relatively flat landscape typical of the Snake River Plain. This area is part of a broad, flat valley that stretches across southern Idaho. The terrain is predominantly level to gently rolling, with occasional low hills and shallow depressions. The elevation in this region is generally around 4,000 to 4,500 feet above sea level. The surrounding landscape is largely agricultural, with vast expanses of farmland dominating the scenery. Fields of crops such as potatoes, sugar beets, and grains are common sights in the area. The flat terrain has been shaped by ancient lava flows and subsequent erosion, resulting in fertile soil that supports extensive agriculture. To the north and south of Rupert, the terrain gradually rises into more rugged landscapes. The Sawtooth National Forest lies to the northeast, featuring more mountainous terrain with higher elevations and steeper slopes. To the south, across the Snake River, the land begins to rise into the South Hills.

Areas Suitable for Large-Scale Solar PV

The regions surrounding Rupert offer several promising locations for large-scale solar photovoltaic (PV) installations. The most suitable areas for such projects would be: 1. The expansive agricultural lands to the west and southwest of Rupert: These areas provide large, open spaces with minimal shading from natural features or structures. The flat terrain would require little to no grading, reducing installation costs and environmental impact. 2. The desert areas to the south of the Snake River: These regions receive ample sunlight throughout the year and have fewer competing land uses. The open, arid landscape would be ideal for solar panel arrays. 3. Abandoned or less productive farmland: Some areas that are no longer suitable for agriculture due to soil depletion or water scarcity could be repurposed for solar energy production. 4. Gently sloping hillsides facing south: While less common in the immediate vicinity of Rupert, any south-facing slopes in the region could provide optimal sun exposure for solar panels. When considering these locations, it's important to factor in proximity to existing power infrastructure, road access for construction and maintenance, and potential environmental impacts. The abundant sunshine in this part of Idaho, combined with the generally flat terrain, makes the area around Rupert a promising location for large-scale solar PV development.

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.