Roi Et, Thailand presents an excellent location for year-round solar energy generation, with consistently high electricity output throughout all seasons. This tropical location benefits from stable sunlight patterns that make it highly suitable for solar photovoltaic installations.

Seasonal Solar Performance

The solar energy production at Roi Et remains remarkably consistent across all seasons, with only modest variations. Spring delivers the highest output at 5.98 kWh per day per kW of installed capacity, closely followed by summer at 5.96 kWh per day. Winter performance drops only slightly to 5.86 kWh per day, while autumn shows the lowest but still substantial output of 5.16 kWh per day. The ideal times for solar generation are spring and summer months, though the relatively small seasonal variation means that solar panels will perform well throughout the entire year. This consistency is typical of tropical locations where seasonal changes are less dramatic than in temperate climates.

Optimal Panel Configuration

For maximum year-round energy production at Roi Et, solar panels should be installed at a fixed tilt angle of 15 degrees facing south. This angle has been calculated to optimize total annual output by accounting for the sun's path throughout the year and the location's specific latitude.

Environmental and Weather Challenges

Several local factors could potentially impact solar energy production at this tropical location:

• Monsoon rains and cloud cover: Thailand's wet season brings heavy rainfall and increased cloud coverage, which can reduce solar irradiance and energy output during certain periods
• High humidity: The tropical climate creates persistent moisture in the air that can affect panel efficiency and create condensation issues
• Dust and debris accumulation: Dry periods can lead to dust buildup on panel surfaces, while wet seasons may deposit organic matter and sediment
• Extreme heat: High temperatures can reduce photovoltaic efficiency, as solar panels typically perform better in moderate temperatures despite needing strong sunlight

Preventative Measures for Optimal Performance

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

• Regular cleaning schedules: Implement frequent panel washing, especially during transition periods between wet and dry seasons
• Adequate ventilation: Install panels with proper spacing and airflow underneath to reduce heat buildup and improve cooling
• Quality mounting systems: Use corrosion-resistant materials designed for tropical climates to withstand high humidity and rainfall
• Drainage considerations: Ensure proper water runoff to prevent standing water and reduce cleaning maintenance
• Monitoring systems: Deploy performance monitoring to quickly identify when panels need attention due to weather-related efficiency drops

Despite these potential challenges, Roi Et's consistent solar output throughout the year makes it a highly favorable location for solar energy investment, with the benefits far outweighing the manageable environmental considerations.

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 88 locations across Thailand. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.

Link: Solar PV potential in Thailand by location

Solar output per kW of installed solar PV by season in Roi Et

Seasonal solar PV output for Latitude: 16.0512, Longitude: 103.6731 (Roi Et, Thailand), 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 15° South in Roi Et, Thailand

To maximize your solar PV system's energy output in Roi Et, Thailand (Lat/Long 16.0512, 103.6731) throughout the year, you should tilt your panels at an angle of 15° 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 Roi Et, Thailand

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 Roi Et, Thailand. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 15° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
0° in Summer	23° South in Autumn	32° South in Winter	9° 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 Roi Et, Thailand

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 Roi Et, Thailand.

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 Roi Et, Thailand

Topographical Features of Roi Et Region

Roi Et sits within the heart of Thailand's northeastern Isan region, characterized by relatively flat terrain that forms part of the expansive Khorat Plateau. This elevated plain stretches across much of northeastern Thailand, creating a landscape dominated by gentle rolling hills, wide valleys, and vast open spaces. The elevation around Roi Et typically ranges from 150 to 200 meters above sea level, with minimal dramatic elevation changes across the immediate vicinity.

The terrain consists primarily of sedimentary rock formations covered by laterite soils, creating a stable geological foundation. Small streams and seasonal waterways meander through the landscape, though the region lacks major rivers or significant water bodies that would create substantial topographical barriers. Rice paddies dominate much of the agricultural land, creating large expanses of relatively level ground that characterize the visual appearance of the area.

Low ridges and gentle hills occasionally break up the otherwise flat terrain, but these features rarely exceed 50-100 meters in height above the surrounding plain. The landscape opens up into broad, unobstructed vistas in many directions, with scattered clusters of trees and small villages dotting the countryside between agricultural areas.

Optimal Areas for Large-Scale Solar Development

The flat to gently rolling topography around Roi Et presents excellent opportunities for large-scale solar photovoltaic installations. The most suitable areas lie on the elevated portions of the Khorat Plateau where the terrain remains level but offers good drainage and stable soil conditions. These locations typically feature minimal shading from surrounding landscape features and provide unobstructed access to solar radiation throughout the day.

Areas with slight southern-facing slopes would be particularly advantageous, as they naturally optimize solar panel orientation while maintaining the engineering simplicity that comes with relatively flat terrain. The gentle elevation changes across the region mean that large solar arrays can be constructed without extensive grading or earth movement, significantly reducing development costs.

Former agricultural lands, particularly those with laterite soil composition, offer stable foundations for solar mounting systems while avoiding the need to clear forested areas. The existing road network throughout the region provides reasonable access for construction and maintenance activities, though some areas might require infrastructure improvements to support large-scale development.

The absence of significant hills, valleys, or other topographical obstacles means that solar installations can be designed in large, continuous blocks rather than smaller fragmented sections. This configuration improves both the efficiency of the electrical systems and the economics of construction and operation. Areas located away from the seasonal waterways would be preferable to avoid potential flooding issues during the rainy season, while still maintaining the flat terrain characteristics that make solar development feasible and cost-effective.

Thailand solar PV Stats as a country

Thailand ranks 26th in the world for cumulative solar PV capacity, with 3,049 total MW's of solar PV installed. This means that 2.90% of Thailand's total energy as a country comes from solar PV (that's 29th in the world). Each year Thailand is generating 44 Watts from solar PV per capita (Thailand ranks 54th in the world for solar PV Watts generated per capita). [source]

Are there incentives for businesses to install solar in Thailand?

Yes, there are several incentives for businesses wanting to install solar energy in Thailand. The Thai government offers a number of tax incentives and subsidies for businesses that install solar energy systems. These include a 30% corporate income tax deduction on the cost of installing solar panels, as well as an exemption from import duties on certain components used in the installation process. Additionally, businesses can benefit from net metering policies which allow them to sell excess electricity generated by their solar system back to the grid at a premium rate. Finally, businesses may also be eligible for grants and other financial assistance from various government agencies and private organizations.

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