Várzea Grande, Brazil represents an excellent location for year-round solar photovoltaic energy generation. Located in the tropics at coordinates -6.5612, -42.1799, this region benefits from consistent sunlight throughout the year, with seasons characterized more by wet and dry periods rather than dramatic temperature variations.

Solar Energy Production Potential

The solar energy output data for Várzea Grande demonstrates strong and consistent performance across all seasons. Winter emerges as the peak production period, generating 6.65 kWh per day per kW of installed solar capacity. This is closely followed by spring at 6.56 kWh/day, autumn at 5.93 kWh/day, and summer at 5.46 kWh/day per kW installed. The winter and spring months represent the ideal times for solar generation at this location, producing approximately 22% more energy than the summer period. This seasonal pattern is typical for tropical locations where the dry season often coincides with clearer skies and optimal solar conditions. For maximum year-round energy production, solar panels should be installed at a fixed tilt angle of 8 degrees facing north. This optimal angle is calculated by analyzing daily solar elevation angles throughout the year and weighting them according to solar irradiance data to maximize total annual output.

Environmental and Weather Challenges

Several significant environmental factors can impact solar production efficiency in Várzea Grande:

• Seasonal rainfall and humidity: The wet season brings increased cloud cover, high humidity, and frequent precipitation that can reduce solar irradiance and create moisture-related issues
• Dust and particulate matter: The dry season often generates significant dust accumulation on solar panels, which can substantially reduce energy output
• Tropical vegetation growth: Rapid plant growth in the humid climate can quickly create shading issues if not properly managed
• Extreme weather events: Tropical storms and heavy rainfall can pose risks to solar installations

Preventative Measures for Optimal Performance

To maximize solar energy production despite these challenges, several preventative measures should be implemented: Regular cleaning schedules become essential, particularly during the dry season when dust accumulation is heaviest. Installing panels with adequate spacing and proper drainage systems helps prevent water pooling during heavy rains. Choosing corrosion-resistant mounting systems and electrical components designed for high-humidity environments extends system lifespan. Vegetation management around solar installations requires ongoing attention to prevent shading from rapidly growing tropical plants. Installing monitoring systems helps identify performance drops quickly, allowing for prompt maintenance responses. Proper system design should account for the region's weather patterns, including robust grounding systems for electrical safety during storms and adequate ventilation to manage heat buildup during humid conditions. Despite these considerations, Várzea Grande's consistent solar resource makes it highly suitable for solar PV installations with appropriate planning and maintenance protocols.

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 Várzea Grande, Piauí

Seasonal solar PV output for Latitude: -6.5612, Longitude: -42.1799 (Várzea Grande, Piauí, 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 8° North in Várzea Grande, Piauí, Brazil

To maximize your solar PV system's energy output in Várzea Grande, Piauí, Brazil (Lat/Long -6.5612, -42.1799) throughout the year, you should tilt your panels at an angle of 8° 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 Várzea Grande, Piauí, 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 Várzea Grande, Piauí, Brazil. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 8° North tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
9° South in Summer	13° North in Autumn	22° North in Winter	1° 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 Várzea Grande, Piauí, 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 Várzea Grande, Piauí, 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 Várzea Grande, Piauí, Brazil

Topography and Terrain

Várzea Grande sits in the heart of Brazil's Mato Grosso state, positioned within the vast Pantanal region and the broader Central-West plateau. The landscape surrounding this area is characterized by relatively flat to gently rolling terrain, with elevations typically ranging between 150 to 300 meters above sea level. This region forms part of the Brazilian Highlands' western edge, where the land gradually transitions from the elevated central plateau toward the extensive wetlands of the Pantanal basin.

The topography features expansive plains interrupted by occasional low hills and gentle undulations. These broad, open spaces are punctuated by seasonal wetlands, gallery forests along waterways, and patches of cerrado savanna vegetation. The terrain's gentle nature means that steep slopes and dramatic elevation changes are uncommon, creating an environment where large-scale development projects can be implemented with relative ease from a topographical perspective.

Climate and Environmental Characteristics

The region experiences a tropical semi-humid climate with distinct wet and dry seasons. During the dry season, which typically extends from May through September, the landscape becomes notably arid with clear skies dominating the weather patterns. The wet season brings substantial rainfall that can temporarily flood lower-lying areas, contributing to the seasonal nature of much of the local hydrology.

Temperature variations throughout the year remain relatively moderate, with warm conditions prevailing across most months. The combination of consistent warmth and extended periods of clear weather during the dry season creates favorable conditions for solar energy generation, particularly when considering the region's position within the tropical zone.

Optimal Areas for Large-Scale Solar Development

The most suitable locations for extensive solar photovoltaic installations would be found on the higher, well-drained portions of the surrounding plateau areas. These elevated zones, typically situated 20 to 50 kilometers northeast and southeast of Várzea Grande, offer several advantages for solar development. The terrain in these areas remains relatively flat while being sufficiently elevated to avoid seasonal flooding issues that affect lower-lying regions.

Areas with gentle south-facing slopes would be particularly advantageous, as they can maximize solar exposure throughout the day while maintaining the gradual gradients necessary for large-scale installation and maintenance access. The cerrado savanna regions, with their naturally sparse vegetation and stable soil conditions, present fewer environmental obstacles compared to forested areas or seasonally inundated wetlands.

The northern approaches to the region, where the terrain begins to rise toward the main plateau, also offer promising conditions. These locations benefit from good drainage, stable ground conditions, and proximity to existing infrastructure while remaining sufficiently distant from environmentally sensitive wetland areas. The combination of accessible terrain, favorable drainage, and reduced vegetation density makes these areas particularly attractive for solar development projects.

Transportation infrastructure considerations also favor certain areas, with locations near existing highways and transmission corridors offering practical advantages for construction and ongoing operations. The relatively flat terrain throughout much of the region means that access road construction and equipment transportation would face minimal topographical challenges in most suitable development zones.

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.