Pendleton, Oregon, United States 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 Production Patterns

The solar energy output at this Northern Temperate Zone location shows dramatic differences throughout the year. Summer provides the strongest performance at 7.80 kWh per day per kW of installed capacity, making it an excellent time for solar generation. Spring follows as the second-best season with 6.30 kWh per day per kW, offering substantial energy production as daylight hours increase. Autumn sees a notable decline to 3.37 kWh per day per kW, while winter presents the most challenging period with only 1.59 kWh per day per kW of installed solar capacity. This winter figure represents just 20% of summer production levels, highlighting the significant seasonal challenge for consistent year-round energy generation.

Optimal Panel Installation

For maximum year-round solar production at Pendleton, fixed solar panels should be tilted at 38 degrees facing south. This angle has been calculated to optimize total annual energy output by accounting for the sun's changing position throughout the year and weighting the angles based on actual solar irradiance data.

Local Environmental and Weather Factors

Several environmental factors in the Pendleton area can impact solar energy production and require consideration during installation:

• Dust and Agricultural Particles: Pendleton's location in an agricultural region means solar panels may accumulate dust, pollen, and farming-related particles that can reduce efficiency
• Winter Weather Conditions: Snow accumulation and ice formation can temporarily block panels and reduce output during the already challenging winter months
• Wind Exposure: The open terrain around Pendleton can subject solar installations to strong winds, requiring robust mounting systems

Preventative Measures for Better Performance

To maximize solar production despite these challenges, several installation strategies prove beneficial. Regular cleaning schedules become particularly important in this agricultural setting, with panels requiring more frequent maintenance during harvest seasons and dusty periods. Snow management systems or steeper panel angles can help with winter snow shedding, though this must be balanced against the optimal 38-degree angle for year-round production. Installing panels with adequate spacing allows for better airflow and easier maintenance access. Robust mounting systems designed for wind loads typical to the region ensure panels remain secure and properly positioned. Ground-mounted systems may offer easier maintenance access compared to rooftop installations, particularly for snow removal and cleaning in this environment. The significant seasonal variation in solar output suggests that Pendleton works best for solar installations paired with battery storage systems or grid-tied arrangements that can compensate for the substantial 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 Pendleton, Oregon

Seasonal solar PV output for Latitude: 45.6634, Longitude: -118.7791 (Pendleton, Oregon, 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 Pendleton, Oregon, United States

To maximize your solar PV system's energy output in Pendleton, Oregon, United States (Lat/Long 45.6634, -118.7791) 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 Pendleton, Oregon, 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 Pendleton, Oregon, 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
29° South in Summer	49° South in Autumn	60° South in Winter	38° 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 Pendleton, Oregon, 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 Pendleton, Oregon, 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 Pendleton, Oregon, United States

Topography Around Pendleton

Pendleton sits in the Columbia River Plateau region of northeastern Oregon, characterized by gently rolling hills and expansive wheat fields that stretch across the landscape. The city itself is positioned at an elevation of approximately 1,200 feet above sea level, nestled within the Umatilla River valley. The surrounding terrain consists primarily of moderate slopes and undulating farmland, with the Blue Mountains rising to the southeast and the Columbia River flowing roughly 30 miles to the north. The immediate area around Pendleton features relatively gentle topography, with most slopes ranging from flat to moderate gradients. The landscape is dominated by agricultural land, particularly dryland wheat farming operations that take advantage of the region's fertile soils. These agricultural areas are interspersed with areas of native grassland and scattered patches of shrubland typical of the inland Pacific Northwest.

Optimal Areas for Large-Scale Solar Development

The most suitable locations for large-scale solar photovoltaic installations around Pendleton would be the relatively flat to gently sloping areas northwest and southwest of the city. These zones offer several advantages for solar development, including minimal topographic constraints that would require extensive grading or specialized mounting systems. The open agricultural lands in these directions provide large contiguous parcels that could accommodate utility-scale solar arrays without significant terrain modifications. The areas along the Umatilla River valley, particularly the broader sections west of Pendleton, present excellent opportunities for solar development. These locations benefit from relatively level ground and good accessibility via existing road networks. The terrain in these areas typically features gradual slopes that can be easily adapted for solar panel installation while maintaining proper drainage. South and southeast of Pendleton, the landscape begins to transition toward the foothills of the Blue Mountains, where steeper slopes and more varied topography may present challenges for large-scale installations. However, some of the intermediate elevation areas in this direction could still be suitable for solar development, particularly on south-facing slopes that would naturally optimize panel orientation. The region's agricultural character means that much of the suitable land is currently in farming use, which could present both opportunities and challenges for solar development. Former agricultural lands or areas with marginal farming potential might be particularly well-suited for solar installations, as the existing land use patterns have already established relatively flat, cleared areas with reasonable access 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.