Trenggalek, East Java, Indonesia presents a very favorable location for year-round solar photovoltaic energy generation. Located in the tropical zone at coordinates -8.0805, 111.7051, this area 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 Trenggalek shows excellent and remarkably consistent performance across all seasons. The location can generate between 5.46 and 6.27 kWh per day for each kW of installed solar capacity, depending on the season. Autumn emerges as the peak solar generation period, producing 6.27 kWh/day per kW of installed capacity. Spring follows closely behind with 6.21 kWh/day per kW. Winter maintains strong production at 5.58 kWh/day per kW, while summer generates 5.46 kWh/day per kW. The relatively small variation between seasons - only about 0.8 kWh difference between the best and worst performing seasons - demonstrates the location's reliability for solar energy production throughout the year.

Optimal Installation Configuration

For fixed panel installations at this location, the ideal tilt angle to maximize total year-round solar production is 8 degrees North. This angle has been calculated by analyzing daily solar elevation angles at this latitude, determining optimal panel tilt for each day, and weighting these angles according to daily photovoltaic potential using solar irradiance data while accounting for Earth's elliptical orbit.

Environmental and Weather Challenges

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

• Monsoon rains and wet season: Extended periods of heavy rainfall and cloud cover during wet seasons can significantly reduce solar irradiance
• High humidity: Tropical humidity can lead to moisture buildup on panels and potential corrosion of electrical components
• Dust and debris accumulation: Dry seasons may bring dust storms or accumulated particles that reduce panel efficiency
• Tropical storms: Occasional severe weather events could damage installations

Preventative Measures for Optimal Performance

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

• Enhanced drainage systems: Install proper drainage around panel arrays to prevent water pooling and ensure quick runoff during heavy rains
• Corrosion-resistant materials: Use marine-grade or tropical-rated mounting hardware, wiring, and electrical components designed to withstand high humidity
• Regular cleaning schedule: Implement frequent panel cleaning, especially during dry seasons, to remove dust and debris that can block sunlight
• Robust mounting systems: Install reinforced mounting structures designed to withstand tropical storm conditions and high winds
• Ventilation considerations: Ensure adequate airflow around panels to prevent overheating and moisture buildup

Despite these potential challenges, Trenggalek's consistent solar output throughout the year makes it an excellent location for solar PV installations, provided that proper tropical-climate installation 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 151 locations across Indonesia. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.

Link: Solar PV potential in Indonesia by location

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

Seasonal solar PV output for Latitude: -8.0805, Longitude: 111.7051 (Trenggalek, Indonesia), 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 Trenggalek, Indonesia

To maximize your solar PV system's energy output in Trenggalek, Indonesia (Lat/Long -8.0805, 111.7051) 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 Trenggalek, Indonesia

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 Trenggalek, Indonesia. 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
8° South in Summer	14° North in Autumn	24° North in Winter	3° 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 Trenggalek, Indonesia

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 Trenggalek, Indonesia.

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 Trenggalek, Indonesia

Topographical Features of Trenggalek Region

Trenggalek is situated in the southern part of East Java, Indonesia, within a region characterized by diverse and dramatic topographical features. The area lies along the southern coast of Java, where the landscape transitions from mountainous terrain in the north to coastal plains and beaches facing the Indian Ocean to the south. The northern portions of Trenggalek are dominated by rugged hills and mountainous terrain that form part of the Southern Mountains of Java. These elevated areas feature steep slopes, deep valleys, and dense forest coverage. The terrain becomes progressively gentler as it moves southward toward the coast, creating a natural gradient from highland to lowland environments. The central areas around Trenggalek town itself occupy a transitional zone where rolling hills and moderate slopes characterize the landscape. This region contains a mix of agricultural land, settlements, and patches of remaining forest. River valleys cut through the terrain, creating fertile corridors that have been extensively cultivated for rice paddies and other crops. Moving toward the southern coast, the topography flattens into coastal plains and terraces. These areas feature gentler gradients and more open terrain, though they are still punctuated by occasional hills and ridges. The coastline itself is marked by limestone cliffs, sandy beaches, and rocky outcrops that create a varied coastal environment.

Optimal Areas for Large-Scale Solar Development

The most suitable locations for large-scale solar photovoltaic installations in the Trenggalek region would be found in the southern coastal plains and the gentler rolling hills of the central transitional zone. These areas offer several advantages for solar development, including relatively flat or gently sloping terrain that minimizes construction costs and maximizes panel efficiency through optimal positioning. The coastal plains south of Trenggalek town present particularly attractive opportunities for solar farms. These areas typically feature open agricultural land with minimal forest cover, reducing environmental concerns and land acquisition complexity. The flatter terrain in these zones allows for easier installation of tracking systems and maintenance access roads, while the proximity to existing infrastructure and population centers facilitates grid connection and project logistics. The central rolling hills region also offers good potential, particularly on south-facing slopes and plateau areas that receive consistent solar exposure throughout the day. While these areas may require more careful site planning to work with the natural contours, they often provide good drainage and are less prone to flooding than completely flat coastal areas. Areas to avoid for large-scale solar development would include the steep mountainous terrain in the northern parts of the region, where construction would be prohibitively expensive and technically challenging. Dense forest areas should also be avoided due to environmental protection concerns and the significant clearing that would be required. Additionally, the immediate coastal zone may present challenges due to salt air corrosion and potential storm surge risks from the Indian Ocean. The river valleys, while relatively flat, may be subject to seasonal flooding and are often prime agricultural land, making them less suitable for permanent solar installations. Instead, the slightly elevated terraces and gentle slopes adjacent to these valleys often provide the ideal compromise between accessibility and environmental suitability for solar development projects.

Indonesia solar PV Stats as a country

Indonesia ranks 71st in the world for cumulative solar PV capacity, with 211 total MW's of solar PV installed. Each year Indonesia is generating 1 Watts from solar PV per capita (Indonesia ranks 88th in the world for solar PV Watts generated per capita). [source]

Are there incentives for businesses to install solar in Indonesia?

Yes, there are several incentives for businesses wanting to install solar energy in Indonesia. The Indonesian government has implemented a number of policies and programs to encourage the adoption of renewable energy sources such as solar power. These include tax exemptions, subsidies, feed-in tariffs, and other financial incentives. Additionally, the government has established a Renewable Energy Fund which provides grants for research and development projects related to renewable energy technologies.

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