Solar Energy Potential in Banjarnegara, Central Java, Indonesia

Banjarnegara, Central Java, Indonesia, located at -7.3961, 109.6961, offers a consistently favorable environment for solar PV energy generation throughout the year. This tropical location benefits from relatively steady sunlight patterns across seasons, which are primarily characterized by wet and dry periods rather than significant temperature variations. The solar energy generation potential remains strong across all meteorological seasons, with autumn showing the highest productivity at 5.67 kWh per day for each kilowatt of installed capacity. Spring and winter follow with respectable outputs of 5.29 kWh/day and 5.23 kWh/day respectively, while summer produces 5.00 kWh/day. This minimal variation between seasons (less than 0.7 kWh difference) demonstrates the location's reliability for year-round solar energy production. For maximizing energy capture at this location, fixed solar panels should be tilted at 8 degrees facing North. This specific angle has been calculated to optimize year-round solar production based on Banjarnegara's position relative to the sun's path throughout the year.

Environmental Considerations

Several environmental factors could potentially impact solar production efficiency in Banjarnegara:

• Heavy rainfall during the wet season (typically October to March) may reduce solar exposure and cause temporary drops in energy production
• Volcanic ash from nearby active volcanoes in Java can accumulate on panels, reducing their efficiency
• High humidity levels can contribute to condensation on panels, particularly during early morning hours

Preventative Measures

To maximize solar energy production despite these challenges, several preventative measures can be implemented: Installing panels with self-cleaning technologies or hydrophobic coatings will help mitigate the effects of volcanic ash and rainfall. Regular maintenance schedules should be established, with more frequent cleaning during the wet season and after any volcanic activity. A slightly steeper tilt than the calculated 8 degrees might be considered to facilitate better water runoff during heavy rains, though this would marginally reduce overall annual production. Additionally, installing quality inverters with high humidity tolerance and proper weatherproofing for all electrical components will ensure system longevity in this tropical climate. Implementing a monitoring system that tracks performance can help identify when environmental factors are affecting output, allowing for timely maintenance interventions that maintain optimal energy production throughout 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 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 Banjarnegara

Seasonal solar PV output for Latitude: -7.3961, Longitude: 109.6961 (Banjarnegara, 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 Banjarnegara, Indonesia

To maximize your solar PV system's energy output in Banjarnegara, Indonesia (Lat/Long -7.3961, 109.6961) 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 Banjarnegara, 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 Banjarnegara, 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	23° North in Winter	2° 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 Banjarnegara, 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 Banjarnegara, 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 Banjarnegara, Indonesia

Topography of Banjarnegara Region

Banjarnegara, located in Central Java, Indonesia, features a diverse and complex topography characterized primarily by mountainous terrain. The region sits within the broader geological context of Java's volcanic mountain range, with elevations varying significantly throughout the area. The landscape consists of steep hills, deep valleys, terraced slopes, and several plateaus interspersed with river systems. The northern portion of Banjarnegara is dominated by the Serayu Mountains, creating a rugged landscape with significant elevation changes. These mountains form part of a larger volcanic chain that runs through Central Java. Notable peaks in the vicinity include Mount Prau and Mount Sindoro, which influence the local topography with their volcanic formations and steep slopes. The central part of the region features the Serayu River valley, which provides some relatively flat terrain amidst the predominantly mountainous landscape. This river valley creates alluvial plains that contrast with the surrounding highlands. The southern portions of Banjarnegara continue with hilly terrain that gradually transitions to more moderate elevations. Throughout the region, the topography has been significantly shaped by both volcanic activity and erosion processes over geological time. This has resulted in a landscape characterized by steep ridges, volcanic deposits, and complex drainage patterns. The combination of elevation changes and river systems creates a mosaic of microclimates and soil conditions across relatively short distances.

Potential Areas for Solar PV Development

When considering large-scale solar photovoltaic (PV) installations near Banjarnegara, several topographical factors must be evaluated. The ideal locations would combine relatively flat terrain, minimal shading from mountains, good solar exposure, and accessibility for construction and maintenance. The Serayu River valley presents one of the more promising areas for solar development. These relatively flat alluvial plains offer larger continuous spaces that could accommodate solar arrays without requiring extensive terrain modification. The valley's orientation also provides favorable exposure to sunlight throughout the day, with fewer obstructions from surrounding mountains compared to other areas. Several plateau regions in the southern parts of Banjarnegara district also merit consideration for solar development. These elevated flat areas typically have fewer issues with morning and evening mountain shadows that might otherwise reduce generation potential. The plateaus also generally experience less cloud cover than the higher mountain slopes, which frequently capture orographic clouds. Areas to avoid would include the steeper northern mountain slopes, which present challenges both in terms of construction feasibility and potential shading issues. The deeply cut valleys between mountains would also be suboptimal due to limited sun exposure during portions of the day as surrounding peaks cast shadows. Agricultural considerations are important when identifying suitable locations, as much of the flatter land is currently used for farming. The most practical approach might involve identifying degraded or less productive agricultural land on gentle slopes or plateaus that could be repurposed for solar energy generation while minimizing impacts on food production. Any large-scale solar development would need to account for the region's susceptibility to landslides, particularly during the wet season. Stability assessments would be essential, especially for installations on modified hillsides or terraced areas. The plateaus and river valley locations typically present fewer geological hazards in this regard, making them more suitable from a risk management perspective.

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!

Citation Guide

Article Details for Citation

Tell Us About Your Work

We love seeing how our research helps others! If you've cited this article in your work, we'd be delighted to hear about it. Drop us a line via our Contact Us page or on X, to share where you've used our information - we may feature a link to your work on our site. This helps create a network of valuable resources for others in the solar energy community and helps us understand how our research is contributing to the field. Plus, we occasionally highlight exceptional works that reference our research on our social media channels.

Feeling generous?

Share this with your friends!

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.