Castilho, Brazil presents a reasonably good location for year-round solar photovoltaic energy generation, though it experiences notable seasonal variations in output that are typical for locations in the Southern Hemisphere tropics.

Seasonal Solar Performance

The solar energy production at this location shows clear seasonal patterns, with summer delivering the highest output at 6.97 kWh per day per kilowatt of installed capacity. Spring follows as the second-best season with 6.36 kWh/day per kW, while autumn produces 5.82 kWh/day per kW. Winter represents the lowest production period at 4.88 kWh/day per kW. This seasonal variation means that summer and spring are the ideal times for solar generation at Castilho, producing approximately 30-43% more energy than during the winter months. The difference between peak summer and lowest winter production is quite significant, representing about a 43% reduction in winter output compared to summer.

Optimal Panel Configuration

For a fixed panel installation at this location, the ideal angle to tilt panels to maximise total year-round production is 19 degrees facing North. This angle is calculated by analyzing daily solar elevation angles throughout the year and weighting them according to solar irradiance data, accounting for Earth's elliptical orbit around the sun.

Environmental and Weather Factors

Several local factors could potentially impact solar production efficiency at Castilho:

• Dust and Agricultural Particles: Being located in an agricultural region of São Paulo state, airborne dust from farming activities and unpaved roads can accumulate on solar panels, reducing their efficiency
• Seasonal Rainfall Patterns: The tropical wet and dry seasons mean extended dry periods can increase dust accumulation, while heavy rains during wet seasons may cause temporary shading from cloud cover
• High Humidity: Tropical humidity can contribute to faster degradation of electrical components if not properly protected
• Temperature Effects: High ambient temperatures during peak sun hours can reduce panel efficiency, as photovoltaic cells perform less efficiently as they heat up

Preventative Measures for Better Performance

To maximize solar energy production despite these challenges, several installation strategies should be considered:

• Regular Cleaning Schedule: Implement a routine panel cleaning program, particularly during dry seasons when dust accumulation is highest
• Proper Ventilation: Install panels with adequate air circulation underneath to help cooling and reduce temperature-related efficiency losses
• Quality Mounting Systems: Use corrosion-resistant mounting hardware designed for tropical climates to withstand humidity and temperature fluctuations
• Electrical Protection: Ensure all electrical components are properly sealed and rated for high-humidity environments

Despite these considerations, Castilho's consistent tropical sunlight and reasonable year-round production levels make it a viable location for solar energy generation, particularly when proper installation and maintenance practices are followed.

Note: The Tropics are located between 23.5° North and -23.5° South of the equator.

So far, we have conducted calculations to evaluate the solar photovoltaic (PV) potential in 3161 locations across Brazil. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.

Link: Solar PV potential in Brazil by location

Solar output per kW of installed solar PV by season in Castilho

Seasonal solar PV output for Latitude: -21.0006, Longitude: -51.6186 (Castilho, Brazil), 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 19° North in Castilho, Brazil

To maximize your solar PV system's energy output in Castilho, Brazil (Lat/Long -21.0006, -51.6186) throughout the year, you should tilt your panels at an angle of 19° North 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 Castilho, Brazil

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 Castilho, Brazil. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 19° North tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
5° North in Summer	27° North in Autumn	36° North in Winter	14° North 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 Castilho, Brazil

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 Castilho, Brazil.

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 Castilho, Brazil

Topographical Features of Castilho Region

The area around Castilho in São Paulo state sits within the western plateau region of Brazil, characterized by relatively gentle rolling terrain and moderate elevations. This part of the Brazilian interior features predominantly flat to gently undulating topography, with elevations typically ranging between 350 and 450 meters above sea level. The landscape consists of broad, open plains interspersed with low hills and shallow valleys carved by seasonal waterways. The region forms part of the Paraná sedimentary basin, which has created extensive areas of relatively uniform terrain ideal for large-scale development. The gentle slopes and stable geological foundations make this area particularly suitable for infrastructure projects. Natural drainage patterns follow subtle gradients toward the Paraná River system, with most watercourses being seasonal or having modest flow rates during dry periods. Local topography shows minimal variation across large areas, with slope gradients rarely exceeding 5-8 degrees except near river valleys and erosional features. The terrain consists primarily of agricultural land that has been cleared and leveled over decades of farming activity, creating vast open spaces with excellent accessibility.

Optimal Areas for Large-Scale Solar Development

The most promising locations for extensive solar photovoltaic installations lie on the broad plateau areas northwest and southwest of Castilho, where the terrain remains consistently flat across several square kilometers. These elevated plains offer stable ground conditions and minimal shading concerns due to the absence of significant topographical obstacles. Areas with southern exposure on gentle north-facing slopes would provide optimal solar orientation for maximum energy capture throughout the day. The relatively uniform elevation across these zones eliminates concerns about shadow casting between panel arrays and allows for efficient grid-pattern installations. The agricultural plains extending toward the Paraná River corridor present particularly attractive opportunities, as much of this land features minimal elevation changes and has already been cleared of native vegetation. These areas benefit from existing rural road networks that would facilitate construction and maintenance access. Regions slightly elevated above the immediate floodplains of local waterways offer the best combination of flat terrain and protection from seasonal flooding. The stable clay and sedimentary soils common throughout the area provide excellent foundations for solar mounting systems without requiring extensive ground preparation. Areas within 10-15 kilometers of existing electrical transmission infrastructure would be most economically viable for large installations, as the flat topography minimizes the complexity and cost of connecting solar facilities to the regional power grid.

Brazil solar PV Stats as a country

Brazil ranks 13th in the world for cumulative solar PV capacity, with 13,708 total MW's of solar PV installed. This means that 2.50% of Brazil's total energy as a country comes from solar PV (that's 31st in the world). Each year Brazil is generating 64 Watts from solar PV per capita (Brazil ranks 47th in the world for solar PV Watts generated per capita). [source]

Are there incentives for businesses to install solar in Brazil?

Yes, there are several incentives for businesses wanting to install solar energy in Brazil. The Brazilian government offers a range of tax credits and other financial incentives to encourage the adoption of renewable energy sources such as solar power. These include reduced import taxes on solar equipment, accelerated depreciation of investments in renewable energy projects, and preferential financing from public banks. Additionally, some states offer additional incentives such as subsidies or grants for businesses that install solar systems.

Do you have more up to date information than this on incentives towards solar PV projects in Brazil? 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.