Caxias, Maranhão, Brazil presents excellent conditions for year-round solar energy generation. Located in the tropical region at coordinates -4.8171, -43.4207, this area benefits from consistent sunlight throughout the year, with seasons defined more by rainfall patterns than temperature variations.

Solar Energy Production Potential

The solar energy output data for Caxias shows remarkably strong and consistent performance across all seasons. During summer, solar panels can generate 5.56 kWh per day for each kW of installed capacity. This output actually improves as the year progresses, with autumn producing 5.95 kWh/day per kW, winter reaching 6.25 kWh/day per kW, and spring delivering the highest output at 6.41 kWh/day per kW. This pattern makes Caxias particularly attractive for solar installations, as the location maintains high energy production year-round with no significant seasonal drops. The best solar generation periods occur during winter and spring months, when output peaks above 6 kWh per day per kW of installed capacity. For optimal results, solar panels should be installed at a fixed tilt angle of 5 degrees facing north. This specific angle maximizes total annual energy production by accounting for the sun's path throughout the year and the location's proximity to the equator.

Environmental and Weather Challenges

Several local factors could potentially impact solar energy production in Caxias:

• Heavy rainfall during wet season: Extended periods of rain and cloud cover can significantly reduce solar output
• High humidity levels: Tropical humidity can cause moisture buildup on panels and affect electrical components
• Dust and debris accumulation: Dry season conditions can lead to dust coating panels, reducing efficiency
• Intense heat: While sunlight is abundant, excessive heat can actually decrease panel efficiency

Preventative Measures for Optimal Performance

To maximize solar energy production despite these challenges, several installation strategies should be considered: Regular cleaning systems or schedules become essential to remove dust, dirt, and organic matter that accumulate on panel surfaces. Installing panels with adequate spacing allows for proper air circulation, helping to keep temperatures manageable and reducing humidity-related issues. Choosing high-quality mounting systems with corrosion-resistant materials is crucial in this tropical environment. Stainless steel or specially coated aluminum components will withstand the humid conditions better than standard materials. Proper drainage around the installation site prevents water pooling during heavy rains. Additionally, selecting solar panels and inverters specifically rated for tropical conditions ensures better long-term performance and reliability. Installing monitoring systems allows for quick identification of performance issues, enabling prompt maintenance when weather-related problems affect energy output. This proactive approach helps maintain the excellent solar potential that Caxias offers throughout the year.

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 Caxias

Seasonal solar PV output for Latitude: -4.8171, Longitude: -43.4207 (Caxias, 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 5° North in Caxias, Brazil

To maximize your solar PV system's energy output in Caxias, Brazil (Lat/Long -4.8171, -43.4207) throughout the year, you should tilt your panels at an angle of 5° 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 Caxias, 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 Caxias, Brazil. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 5° North tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
11° South in Summer	11° North in Autumn	20° North in Winter	1° 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 Caxias, 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 Caxias, 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 Caxias, Brazil

Topographical Features of Caxias Region

The city of Caxias sits in the eastern portion of Maranhão state, positioned within Brazil's transition zone between the Amazon Basin and the Northeast region. The surrounding landscape is characterized by relatively flat to gently rolling terrain, with elevations typically ranging from 100 to 300 meters above sea level. This area forms part of the Brazilian Highlands' eastern edge, where the terrain gradually descends toward the Atlantic coastal plains. The region features a mix of cerrado savanna and caatinga vegetation, with scattered patches of gallery forest along watercourses. The topography is dominated by broad, undulating plateaus interrupted by shallow valleys carved by seasonal streams and tributaries of the Itapecuru River system. These waterways create a dendritic drainage pattern across the landscape, with most streams flowing in a generally northeastward direction toward the Atlantic Ocean.

Geological Foundation and Land Characteristics

The underlying geology consists primarily of sedimentary rocks from the Parnaíba Basin, creating stable foundation conditions across much of the region. The soils are typically well-drained lateritic types, formed through weathering processes common to tropical climates. These characteristics result in firm ground conditions that can adequately support infrastructure development without requiring extensive foundation modifications. The terrain exhibits minimal slopes across most areas, with gradient changes rarely exceeding 5-8 degrees except near river valleys and occasional escarpments. This gentle topography extends for considerable distances in all directions from Caxias, creating expansive areas of relatively uniform elevation and aspect.

Optimal Areas for Large-Scale Solar Development

The most suitable locations for extensive solar photovoltaic installations lie to the south and southeast of Caxias, where the terrain becomes increasingly flat and open. These areas feature minimal topographical variation, reducing the need for extensive site preparation and grading work. The consistent elevation and gentle slopes allow for efficient panel arrangement and maintenance access while minimizing shading issues between panel rows. The northeastern quadrant around Caxias also presents favorable conditions, particularly where the landscape opens into broader plateaus with good drainage characteristics. These locations benefit from stable soil conditions and relatively uniform microclimates due to the consistent topography. Areas immediately adjacent to major watercourses should generally be avoided due to potential flooding concerns and the presence of riparian vegetation that may create shading or environmental restrictions. Similarly, the steeper terrain found in some river valley approaches would require more complex engineering solutions and potentially higher development costs. The region's overall topographical uniformity means that large solar installations can potentially be developed as contiguous projects spanning significant areas, rather than being fragmented by major geographical obstacles. This characteristic supports economies of scale in both construction and ongoing maintenance operations.

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.