Wonosari, Yogyakarta, Indonesia presents an excellent location for year-round solar energy generation. Located in the tropical zone at coordinates -7.9659, 110.6059, this area benefits from consistent sunlight throughout most of the year, with seasons typically characterized by wet and dry periods rather than dramatic temperature variations.

Solar Energy Production Potential

The solar energy output data for Wonosari shows remarkably consistent performance across all seasons. During summer months, each kilowatt of installed solar panels can generate approximately 4.96 kWh per day. The performance actually improves during the cooler months, with autumn producing 5.57 kWh/day, winter generating 5.50 kWh/day, and spring delivering the highest output at 5.77 kWh/day per kilowatt of installed capacity. This seasonal pattern is typical for tropical locations, where the slightly cooler temperatures during non-summer months can actually improve solar panel efficiency, while still maintaining excellent sun exposure. Spring emerges as the optimal season for solar generation, followed closely by autumn and winter, making this location ideal for consistent energy production throughout the year.

Optimal Panel Installation

For fixed-panel installations at Wonosari, Yogyakarta, the ideal tilt angle is 9 degrees facing North. This specific angle maximizes total year-round solar production by accounting for the sun's path throughout the year, Earth's elliptical orbit, and the location's proximity to the equator. The relatively shallow tilt angle reflects the area's tropical latitude, where the sun remains high in the sky year-round.

Environmental and Weather Challenges

Several local factors could potentially impact solar energy production in Wonosari, Yogyakarta, though the location remains highly suitable overall:

• Monsoon seasons and heavy rainfall: Indonesia experiences distinct wet and dry seasons, with intense rainfall during monsoon periods that can reduce solar irradiance and create cloudy conditions for extended periods.
• High humidity levels: Tropical humidity can lead to moisture buildup on panels and potentially affect electrical components over time.
• Dust and volcanic ash: The region's proximity to active volcanoes means occasional ash deposits, while dry seasons can bring dust accumulation on panel surfaces.
• Tropical storms: Seasonal weather patterns may include strong winds and storms that could damage installations if not properly secured.

Preventative Measures for Optimal Performance

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

• Enhanced drainage systems: Install panels with adequate spacing and proper drainage to prevent water pooling during heavy rains.
• Regular cleaning schedules: Implement frequent panel cleaning routines, especially during dry seasons and after volcanic activity, to remove dust and ash buildup.
• Moisture-resistant components: Use high-quality, humidity-resistant inverters and electrical components specifically rated for tropical climates.
• Robust mounting systems: Install reinforced mounting structures designed to withstand tropical storm winds and heavy rainfall.
• Ventilation considerations: Ensure adequate airflow around panels to prevent overheating and moisture accumulation in the humid environment.

Despite these considerations, Wonosari's consistent high solar output throughout all seasons makes it an exceptionally favorable location for solar energy investment, with proper installation and maintenance practices ensuring optimal long-term performance.

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 Wonosari

Seasonal solar PV output for Latitude: -7.9659, Longitude: 110.6059 (Wonosari, 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 9° North in Wonosari, Indonesia

To maximize your solar PV system's energy output in Wonosari, Indonesia (Lat/Long -7.9659, 110.6059) throughout the year, you should tilt your panels at an angle of 9° 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 Wonosari, 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 Wonosari, Indonesia. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 9° 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	15° North in Autumn	23° 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 Wonosari, 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 Wonosari, 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 Wonosari, Indonesia

Topographical Features of Wonosari Region

Wonosari sits in the heart of the Gunungkidul Regency in Yogyakarta Special Region, characterized by distinctive karst limestone terrain that defines much of the landscape. The area forms part of the Southern Mountains physiographic zone of Java, where ancient coral reefs have been uplifted over geological time to create a unique topographical setting. Rolling hills and plateaus dominate the scenery, with elevations typically ranging from 150 to 700 meters above sea level. The karst topography creates a landscape of gentle to moderate slopes punctuated by numerous caves, underground rivers, and occasional sinkholes. Unlike the volcanic regions found elsewhere in Java, this limestone terrain lacks the steep volcanic cones and deep valleys that characterize other parts of the island. Instead, the land presents a more subdued relief with broad, undulating surfaces that have been shaped by millions of years of water erosion working on the soluble limestone bedrock. Drainage patterns in the region are largely underground due to the porous nature of the limestone, resulting in relatively dry surface conditions across much of the area. The landscape is dotted with small hills called "mogotes" - isolated limestone towers that rise abruptly from the surrounding plains. Between these features, extensive flat to gently sloping areas provide natural platforms that could accommodate large-scale development projects.

Climate and Weather Patterns

The region experiences a tropical monsoon climate with distinct wet and dry seasons. The dry season, typically lasting from April through October, brings clear skies and minimal cloud cover to much of the area. During this period, the limestone terrain's limited surface water retention means that vegetation remains relatively sparse, reducing potential shading issues that might affect solar installations. The wet season brings increased precipitation and cloud cover, though the well-draining limestone substrate means that standing water rarely persists for extended periods. The elevated position of much of the terrain also helps promote air circulation, which can be beneficial for maintaining optimal operating temperatures in solar equipment.

Optimal Areas for Large-Scale Solar Development

The most suitable locations for extensive solar photovoltaic installations would be found on the broader plateau areas and gentle slopes that characterize the northern and eastern portions of the Wonosari region. These areas offer several advantages including relatively flat terrain that minimizes grading requirements, stable limestone bedrock for foundation support, and minimal competing land uses due to the challenging agricultural conditions. The elevated plateaus between Wonosari and the neighboring areas of Playen and Paliyan present particularly promising opportunities. These locations combine favorable topographical conditions with good accessibility via existing road networks. The terrain in these areas typically features slopes of less than 10 degrees across extensive areas, making them well-suited for large solar arrays without requiring significant earthwork or specialized mounting systems. Areas to the south and southwest of Wonosari, while still topographically suitable in many locations, may present more challenges due to the increased frequency of mogote formations and slightly more dissected terrain. However, the valleys and plains between these limestone towers could still accommodate substantial solar installations with appropriate site planning. The eastern approaches toward Semanu offer another zone of interest, where the karst plateau transitions toward slightly lower elevations while maintaining the favorable geological stability and relatively open terrain that characterizes the broader region. These transitional areas often provide the best combination of accessible flat land and minimal environmental constraints.

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.