Solar PV Analysis of Eureka, United States
Eureka, California, located in the Northern Temperate Zone, presents a mixed picture for solar energy generation via photovoltaic (PV) panels. The city's geographical position at latitude 40.7586 and longitude -124.1631 offers varying levels of solar potential throughout the year.
Seasonal Solar Production
Solar energy production in Eureka fluctuates significantly across seasons. Summer stands out as the most productive period, with an average daily output of 6.67 kWh per kW of installed solar capacity. Spring follows closely behind, generating 6.37 kWh/day. However, production drops considerably in autumn to 3.87 kWh/day, and reaches its lowest point in winter at just 2.28 kWh/day.
Optimal Times for Solar Generation
The most favorable months for solar energy production in Eureka are typically from May to September. During this period, longer daylight hours and generally clearer skies contribute to higher solar panel efficiency. The shoulder seasons of spring and early autumn can also provide good solar yields, though with more variability.
Panel Installation Considerations
For fixed panel installations in Eureka, the ideal tilt angle to maximize year-round solar production is 35 degrees facing south. This angle optimizes the panels' exposure to sunlight throughout the year, taking into account the city's latitude and seasonal sun paths.
Environmental and Weather Factors
Eureka's coastal location introduces several challenges for solar energy production:
- Fog and Marine Layer: Frequent coastal fog, especially in summer mornings, can significantly reduce solar panel efficiency.
- Cloud Cover: The region experiences substantial cloud cover throughout the year, particularly in winter months.
To mitigate these challenges, consider the following preventative measures:
- Use high-efficiency panels designed to perform well in diffuse light conditions.
- Implement a robust cleaning schedule to remove salt spray deposits that may accumulate on panels.
- Consider micro-inverters or power optimizers to minimize the impact of partial shading from fog or clouds.
While Eureka's location is not ideal for year-round solar production, proper system design and maintenance can still yield significant energy benefits, particularly during the more favorable months of late spring through early fall.
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 Eureka
Seasonal solar PV output for Latitude: 40.7586, Longitude: -124.1631 (Eureka, 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 35° South in Eureka, United States
To maximize your solar PV system's energy output in Eureka, United States (Lat/Long 40.7586, -124.1631) throughout the year, you should tilt your panels at an angle of 35° 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 Eureka, 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 Eureka, United States. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 35° 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 | 45° South in Autumn | 55° South in Winter | 33° 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 Eureka, 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 Eureka, United States.
Our calculation method
- Solar Position:
We determine the Sun's position on the Winter solstice using the location's latitude and solar declination. - Shadow Projection:
We calculate the shadow length cast by panels using trigonometry, considering panel tilt and the Sun's elevation angle. - 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 Eureka, United States
The topography around Eureka, California, is quite varied and interesting. The city itself sits on relatively flat land along the coast of Humboldt Bay, but the surrounding area quickly becomes more diverse in terms of elevation and landscape features.
To the east of Eureka, the terrain begins to rise into the coastal hills and mountains. These hills are part of the Coast Ranges, a series of mountain ranges that run parallel to the Pacific coast. The landscape in this direction is characterized by steep, forested slopes and deep valleys. As you move further inland, the elevation continues to increase, with some peaks reaching heights of over 3,000 feet within a relatively short distance from the coast.
To the north and south of Eureka, the coastline is marked by rugged cliffs, rocky beaches, and small coves. The famous Redwood National and State Parks, known for their towering old-growth redwood trees, are located just north of Eureka. These parks feature a mix of coastal plains and forested hills.
Regarding areas nearby that would be most suited for large-scale solar PV (photovoltaic) installations, the options are somewhat limited due to the region's topography and climate. The coastal area around Eureka is known for its frequent fog and overcast conditions, which are not ideal for solar energy production. However, there are a few potential areas that might be more suitable:
- The relatively flat areas just inland from the coast, particularly to the southeast of Eureka, might offer some potential. These areas receive slightly more sunlight than the immediate coastal zone.
- Some of the higher elevation areas in the coastal mountains to the east could be considered, as they often rise above the marine layer and receive more direct sunlight. However, the steep terrain would present challenges for installation and maintenance.
- The Eel River Valley, located about 20 miles to the south of Eureka, has more open, flat land and generally experiences less fog than the immediate coastal areas. This region might offer better conditions for solar PV installations.
It's important to note that while these areas might be relatively more suitable for solar PV in the region, the overall climate of California's north coast is not ideal for large-scale solar energy production compared to the sunnier regions of central and southern California. Any major solar projects in this area would need to carefully consider the unique local climate conditions and topographical challenges.
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!
Citation Guide
Article Details for Citation
Author: Aaron Robinson
Publisher: profileSOLAR.com
First Published: Monday 19th of August 2024
Last Updated: Monday 21st of July 2025
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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.
