Viana, Brazil presents a highly favorable location for year-round solar energy generation through photovoltaic panels. Situated in the tropics at coordinates -20.3708, -40.512, this region benefits from consistent sunlight throughout most of the year, with seasonal variations characterized more by wet and dry periods than by dramatic changes in daylight hours.

Solar Energy Production Potential

The solar energy output data for Viana demonstrates strong year-round performance. Summer delivers the highest production at 6.23 kWh per day per kW of installed solar capacity, making it the optimal season for solar generation. Spring follows as the second-best performing season with 5.03 kWh/day per kW, while autumn produces 5.34 kWh/day per kW. Even during winter, the lowest-producing season, the location still generates a respectable 4.44 kWh/day per kW of installed capacity. For maximum efficiency, solar panels should be installed at a fixed tilt angle of 19 degrees facing north. This angle has been calculated to optimize total year-round solar production by accounting for the sun's path throughout the seasons and the Earth's elliptical orbit around the sun.

Environmental and Weather Challenges

Several local factors could potentially impact solar energy production in Viana and require consideration during installation planning. The tropical climate brings intense humidity and frequent rainfall, particularly during wet seasons. High humidity can reduce solar panel efficiency and create condensation issues, while heavy rains may temporarily reduce energy output. However, rain also provides a natural cleaning effect that helps maintain panel performance. Tropical locations often experience severe weather events including strong winds and occasional storms. These conditions can damage solar installations if not properly secured and designed to withstand local weather patterns. The consistently warm temperatures, while beneficial for year-round production, can actually reduce solar panel efficiency since photovoltaic cells perform better in cooler conditions. Excessive heat buildup can decrease overall energy output.

Preventative Measures for Optimal Performance

Several installation strategies can help maximize solar energy production despite these environmental challenges:

• Install robust mounting systems designed to withstand high winds and storms common to tropical regions
• Ensure proper ventilation around panels to prevent overheating and maintain cooling airflow
• Use high-quality, weather-resistant components rated for tropical conditions and high humidity
• Implement effective drainage systems to prevent water accumulation around installations
• Consider anti-reflective coatings and self-cleaning panel surfaces to maintain efficiency during humid conditions

Regular maintenance becomes particularly important in tropical climates. While natural rainfall helps clean panels, periodic professional cleaning and inspection ensures optimal performance and early detection of any weather-related damage. Despite these considerations, Viana's location remains highly suitable for solar energy generation, with its consistent tropical sunlight providing reliable energy production throughout all seasons of 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 Viana, Espírito Santo

Seasonal solar PV output for Latitude: -20.3708, Longitude: -40.512 (Viana, Espírito Santo, 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 Viana, Espírito Santo, Brazil

To maximize your solar PV system's energy output in Viana, Espírito Santo, Brazil (Lat/Long -20.3708, -40.512) 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 Viana, Espírito Santo, 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 Viana, Espírito Santo, 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
4° North in Summer	26° 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 Viana, Espírito Santo, 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 Viana, Espírito Santo, 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 Viana, Espírito Santo, Brazil

Topographical Features Around Viana

Viana is located in the southeastern region of Brazil within Espírito Santo state, positioned in an area characterized by relatively gentle rolling hills and coastal plain topography. The landscape around this municipality features a mix of low-lying coastal plains extending westward from the Atlantic Ocean and gradually rising terrain that transitions into the foothills of the Brazilian Highlands. The elevation in the immediate vicinity typically ranges from near sea level along the eastern coastal areas to modest hills reaching several hundred meters in height as one moves inland toward the west and northwest.

The terrain displays the characteristic features of the Atlantic coastal region, with undulating hills interspersed with river valleys and flatter agricultural areas. Several small rivers and streams flow through the region, creating gentle valleys that break up the otherwise rolling topography. The soil composition varies from sandy coastal soils near the ocean to more clay-rich soils in the inland areas, reflecting the geological transition from marine sediments to weathered crystalline basement rocks of the Brazilian Shield.

The coastal influence moderates the local climate and creates relatively stable atmospheric conditions throughout much of the year. The landscape shows evidence of both natural vegetation patterns and extensive agricultural development, with cleared areas for cattle ranching and crop cultivation creating a patchwork of land uses across the rolling terrain.

Optimal Areas for Large-Scale Solar Development

The most promising locations for large-scale solar photovoltaic installations around Viana would be the gently sloping hills and elevated plateaus found in the western and northwestern portions of the municipality. These areas offer several advantages including good natural drainage, reduced risk of flooding, and typically feature slopes that can be oriented to maximize solar exposure throughout the day. The elevated terrain also tends to experience better air circulation, which helps maintain optimal operating temperatures for solar panels.

The flatter agricultural areas and former pasturelands scattered throughout the region present excellent opportunities for ground-mounted solar arrays. These locations often have existing road access and electrical infrastructure, making them more economical to develop. The relatively open terrain with minimal tree cover in many of these areas reduces shading concerns and simplifies site preparation.

Areas with gentle south-facing slopes would be particularly well-suited for solar installations, as they can naturally optimize panel orientation for maximum energy capture. The rolling hills provide natural windbreaks while still allowing sufficient air circulation around solar equipment. Additionally, many of these elevated areas are removed from sensitive coastal ecosystems and existing urban development, reducing potential environmental and social conflicts.

The region's proximity to existing electrical transmission infrastructure along major transportation corridors makes grid connection more feasible for large installations. Areas near established roads and power lines would minimize the additional infrastructure investment required to bring solar projects online, making them the most economically attractive locations for development.

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.