Clearlake, California offers a moderately good location for year-round solar energy generation, though with significant seasonal variations typical of the Northern Temperate Zone climate.

Seasonal Solar Performance

The solar energy output at this location shows strong seasonal patterns. Summer provides the highest production at 8.36 kWh per day per installed kilowatt, making it the peak season for solar generation. Spring follows as the second-best season with 7.40 kWh per day per kilowatt, offering excellent solar conditions. Autumn sees a notable decline to 4.49 kWh per day per kilowatt, while winter represents the challenging season with only 2.87 kWh per day per kilowatt. This winter figure is quite low and reflects the reduced solar availability during the shorter, cloudier months. For optimal year-round performance, solar panels should be installed at a fixed tilt angle of 33 degrees facing south. This angle maximizes total annual energy production by accounting for the sun's changing position throughout the year and weighting the optimal angles based on actual solar irradiance data.

Local Factors Affecting Solar Production

Several environmental factors in the Clearlake area can significantly impact solar energy generation:

• Wildfire smoke: Northern California experiences regular wildfire seasons that can dramatically reduce solar output by blocking sunlight with thick smoke and ash
• Tule fog: Dense ground fog common in Central and Northern California valleys can persist for days or weeks during winter months
• Dust and ash accumulation: Particles from fires, agricultural activities, and natural dust can coat panels and reduce efficiency
• High winds: The area can experience strong winds that may affect panel positioning and accumulate debris

Preventative Measures for Better Performance

To maximize solar energy production despite these challenges, several installation strategies prove effective. Regular cleaning systems or easy-access panel designs help combat dust and ash buildup, which is particularly important during and after fire seasons. Installing panels with adequate spacing and secure mounting systems helps them withstand high winds while allowing for proper air circulation. Choosing panels with anti-reflective coatings can help maintain efficiency even when some particle buildup occurs. Monitoring systems that track daily production can quickly identify when cleaning or maintenance is needed, especially after smoke events or dust storms. Some installers also recommend slightly steeper mounting angles in areas prone to dust accumulation, as this helps panels self-clean during rain. Despite these environmental challenges, Clearlake's location still offers reasonable solar potential, particularly during the excellent spring and summer seasons when most of the annual energy generation occurs.

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 Clearlake

Seasonal solar PV output for Latitude: 38.9602, Longitude: -122.6334 (Clearlake, 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 33° South in Clearlake, United States

To maximize your solar PV system's energy output in Clearlake, United States (Lat/Long 38.9602, -122.6334) throughout the year, you should tilt your panels at an angle of 33° 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 Clearlake, 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 Clearlake, United States. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 33° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
22° South in Summer	43° South in Autumn	53° South in Winter	31° 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 Clearlake, 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 Clearlake, 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 Clearlake, United States

Topography of the Clearlake Region

Clearlake sits in a distinctive geographical setting within California's Lake County, positioned at the southern end of Clear Lake, the state's largest natural freshwater lake. The city occupies relatively flat terrain along the lakeshore, with elevations ranging from approximately 1,320 to 1,400 feet above sea level. This lakeside location provides generally level ground that extends inland from the water's edge, creating favorable conditions for development and infrastructure.

The broader landscape surrounding Clearlake is characterized by rolling hills and mountainous terrain typical of the California Coast Ranges. To the north and east, the terrain gradually rises into more pronounced hills and ridgelines, while the western areas feature similar undulating topography. The Mayacamas Mountains form a significant geographical feature to the south and southeast, creating a natural barrier between Lake County and the Napa Valley region.

Clear Lake itself dominates the local geography, stretching approximately 19 miles in length and covering over 43,000 acres. The lake's presence moderates the local climate and creates unique microclimatic conditions throughout the basin. The surrounding watershed encompasses numerous smaller valleys, ridges, and creek systems that drain into the main body of water.

Optimal Areas for Large-Scale Solar Development

The most promising locations for large-scale solar photovoltaic installations near Clearlake would be the relatively flat to gently sloping areas that extend inland from the lake's southern and eastern shores. These zones offer several advantages including minimal grading requirements, reduced installation costs, and easier access for construction and maintenance equipment. The agricultural lands and open spaces in these areas typically have fewer topographical constraints compared to the steeper hillsides found elsewhere in the region.

Areas with southern-facing slopes at gentle gradients would be particularly well-suited for solar development, as they naturally optimize panel orientation for maximum energy capture throughout the day. The rolling hills to the east and southeast of Clearlake contain numerous such sites where the terrain provides natural south-facing aspects while maintaining manageable slopes for large-scale installations.

The flatter agricultural areas and former ranch lands scattered throughout the Clear Lake basin represent another category of excellent solar development sites. These locations often have existing road access, electrical infrastructure nearby, and minimal environmental constraints. The open character of much of this land, combined with its relatively level topography, makes it ideal for the grid-like arrays required for utility-scale solar projects.

Conversely, the steeper mountainous areas and heavily forested ridgelines would be less suitable for large-scale solar development due to challenging terrain, higher development costs, and potential environmental sensitivities. The immediate lakeshore areas, while topographically favorable, may face regulatory restrictions related to scenic protection and waterfront preservation that could limit solar development opportunities.

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.