Solar PV Analysis of Gilroy, United States
Gilroy, California, located in the Northern Temperate Zone, offers a relatively favorable environment for solar energy generation throughout the year. With its geographical coordinates at 37.0156° N latitude and 121.5779° W longitude, this location experiences significant seasonal variations in solar energy production.
Seasonal Solar Performance
Solar energy output in Gilroy fluctuates considerably across the seasons. Summer stands out as the most productive period, with an impressive average daily output of 8.63 kWh per kW of installed solar capacity. Spring follows closely, yielding 7.53 kWh/day. Autumn sees a noticeable decrease in production, averaging 4.90 kWh/day, while winter experiences the lowest output at 3.04 kWh/day.
The substantial difference between summer and winter production highlights the impact of seasonal changes on solar energy generation in this region. However, the relatively high output during spring and summer months compensates for the reduced winter performance, making Gilroy a generally suitable location for year-round solar energy production.
Optimal Panel Installation
To maximize year-round solar energy production in Gilroy, fixed solar panels should be installed at a tilt angle of 31 degrees facing south. This angle has been calculated to optimize the panels' exposure to sunlight throughout the year, taking into account the Earth's elliptical orbit and the location's specific latitude.
Environmental Considerations
While Gilroy's climate is generally conducive to solar energy production, there are a few environmental factors to consider:
- Fog: Gilroy can experience morning fog, especially during summer months. This may temporarily reduce solar output in the early hours of the day.
- Wildfire smoke: California's wildfire season can lead to periods of reduced air quality and sunlight obstruction, potentially impacting solar production.
To mitigate these issues, consider installing panels at a slightly steeper angle to encourage fog runoff and reduce dust accumulation. Regular cleaning and maintenance of the panels can also help maintain optimal performance, especially during wildfire season.
Overall, despite some seasonal variations and occasional environmental challenges, Gilroy presents a favorable location for solar PV installations, with ample opportunity for energy generation throughout the year.
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 Gilroy
Seasonal solar PV output for Latitude: 37.0156, Longitude: -121.5779 (Gilroy, 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 31° South in Gilroy, United States
To maximize your solar PV system's energy output in Gilroy, United States (Lat/Long 37.0156, -121.5779) throughout the year, you should tilt your panels at an angle of 31° 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 Gilroy, 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 Gilroy, United States. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 31° South tilt angle throughout the year.
| Overall Best Summer Angle | Overall Best Autumn Angle | Overall Best Winter Angle | Overall Best Spring Angle |
|---|---|---|---|
| 21° South in Summer | 41° South in Autumn | 51° South in Winter | 29° 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 Gilroy, 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 Gilroy, 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 Gilroy, United States
The topography around Gilroy, California, is diverse and interesting. The city itself sits in the southern part of Santa Clara Valley, which is relatively flat and known for its fertile agricultural land. This valley is part of the larger Santa Clara Valley, often referred to as Silicon Valley in its northern reaches.
To the east of Gilroy, the landscape begins to rise into the Diablo Range, a series of rolling hills and small mountains that separate the Santa Clara Valley from the San Joaquin Valley. These hills become progressively higher and more rugged as you move eastward.
To the west, you'll find the Santa Cruz Mountains, which are generally steeper and more densely forested than the Diablo Range. These mountains separate the Santa Clara Valley from the Pacific coast.
South of Gilroy, the valley narrows and continues as the San Benito Valley, with hills on either side gradually closing in.
For large-scale solar PV installations, the most suitable areas nearby would likely be the flatter portions of the Santa Clara Valley, particularly to the south and southeast of Gilroy. These areas offer several advantages:
- They are relatively flat, which makes construction and maintenance easier.
- They receive ample sunlight due to the lack of tall obstructions.
- They are close to existing infrastructure and power grids.
- Some of this land may be less productive for agriculture, making it available for solar development.
The foothills of the Diablo Range to the east might also offer some suitable locations, particularly on south-facing slopes. However, these areas would likely be more challenging to develop due to the terrain.
It's important to note that any large-scale solar development would need to balance energy production goals with agricultural preservation, as the Santa Clara Valley is known for its productive farmland. Environmental impact studies and local zoning regulations would play a significant role in determining the feasibility of such projects.
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: Saturday 31st 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.
