Tegal, Central Java, Indonesia, located at latitude -6.8711 and longitude 109.1385, presents a favorable environment for solar energy generation throughout the year. This tropical location experiences consistent sunlight, with seasons primarily characterized by wet and dry periods rather than traditional temperature-based seasons.

Solar Energy Potential

The solar energy output in Tegal demonstrates impressive consistency across all meteorological seasons. Spring yields the highest production at 5.77 kWh per day for each kilowatt of installed solar capacity. This is closely followed by autumn at 5.61 kWh/day and winter at 5.51 kWh/day. Summer, interestingly, shows the lowest output at 4.46 kWh/day, though still maintaining a substantial energy generation potential. These figures indicate that Tegal is an excellent location for year-round solar energy production. The relatively small variation between seasons suggests that solar installations in this area can provide a steady and reliable source of renewable energy throughout the year.

Optimal Panel Positioning

For fixed solar panel installations in Tegal, Central Java, the ideal tilt angle to maximize year-round energy production is 8 degrees facing North. This angle has been calculated taking into account the location's latitude, daily solar elevation angles, and potential daily PV output based on NASA's solar irradiance data.

Environmental Considerations

While Tegal's tropical climate is generally conducive to solar energy production, there are some environmental factors to consider: 1. High humidity: The tropical climate can lead to increased moisture, potentially affecting solar panel efficiency and longevity. 2. Heavy rainfall: During the wet season, frequent rain may temporarily reduce solar output. To mitigate these issues, preventative measures can be implemented during solar installation: - Use high-quality, weather-resistant solar panels designed for tropical climates. - Install panels at the recommended 8-degree tilt to facilitate natural cleaning by rainwater. - Implement a regular cleaning and maintenance schedule to prevent buildup of dirt or organic matter. - Consider using micro-inverters or power optimizers to minimize the impact of partial shading from clouds. By taking these precautions, solar installations in Tegal can maintain high efficiency and durability, capitalizing on the location's excellent year-round solar potential.

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 Tegal

Seasonal solar PV output for Latitude: -6.8711, Longitude: 109.1385 (Tegal, 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 Tegal, Indonesia

To maximize your solar PV system's energy output in Tegal, Indonesia (Lat/Long -6.8711, 109.1385) 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 Tegal, 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 Tegal, 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
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 Tegal, 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 Tegal, 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 Tegal, Indonesia

The topography around Tegal, Indonesia, is characterized by a diverse landscape that transitions from coastal lowlands to inland hills and mountains. Situated on the northern coast of Central Java, Tegal is primarily flat near the shoreline, with elevations gradually increasing as one moves southward. The coastal area of Tegal is dominated by a wide, flat plain that extends several kilometers inland. This low-lying region is largely composed of alluvial deposits, making it fertile ground for agriculture. Rice paddies, fish ponds, and various crop fields are common sights in this area. As you move further south from the coast, the terrain begins to undulate gently, forming rolling hills that become more pronounced with distance. These hills are part of the larger Central Java mountain range that runs along the spine of the island. The elevation continues to rise, eventually leading to more significant peaks and volcanic formations further inland.

Suitable Areas for Large-scale Solar PV

When considering locations for large-scale solar photovoltaic (PV) installations near Tegal, the flat coastal plains offer the most promise. These areas provide several advantages for solar energy development: Firstly, the abundance of open, level ground makes it easier and more cost-effective to install large arrays of solar panels. The lack of significant slopes or terrain variations simplifies construction and maintenance processes. Secondly, the coastal region experiences high levels of solar radiation throughout the year due to its proximity to the equator and the absence of tall geographical features that could cast shadows. This consistent sunlight exposure maximizes the potential energy output of solar installations. Additionally, the agricultural nature of the coastal plain means that there are likely to be large, contiguous parcels of land available for development. This availability of space is crucial for utility-scale solar projects that require substantial land area. However, it's important to note that while the coastal areas are most suitable for large-scale solar PV, careful planning would be necessary to balance energy production with agricultural needs and potential environmental impacts. Areas slightly inland, where the terrain begins to rise but remains relatively flat, could also be considered as they may offer a compromise between optimal solar conditions and preservation of prime agricultural land.

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.