Slawi, Central Java, Indonesia, located at latitude -6.9797 and longitude 109.1392, presents a favorable environment for solar energy generation throughout the year. This tropical location benefits from consistent sunlight, with seasons characterized more by wet and dry periods rather than traditional temperature-based seasons.

Solar Energy Potential

The solar energy potential in Slawi is impressive, with relatively high and stable electricity output across all meteorological seasons. Spring sees the highest production at 5.75 kWh per day for each kilowatt of installed solar capacity, followed closely by autumn at 5.61 kWh/day and winter at 5.54 kWh/day. Summer, while still productive, shows a slightly lower output at 4.45 kWh/day. These figures indicate that Slawi is an excellent location for solar PV installations, with the potential for consistent energy generation throughout the year. The minimal variation between seasons suggests that solar panels would be a reliable source of renewable energy in this area.

Optimal Panel Tilt

For fixed panel installations in Slawi, Central Java, the ideal tilt angle to maximize year-round solar production is 8 degrees North. This slight tilt helps to optimize the panels' exposure to sunlight throughout the year, taking into account the location's proximity to the equator and the sun's path across the sky.

Environmental Considerations

While Slawi's tropical climate is generally favorable for solar energy production, there are some environmental factors to consider: 1. High humidity and rainfall: The tropical climate can lead to increased moisture, potentially affecting solar panel efficiency and lifespan. 2. Dust and debris: Agricultural activities in the region may contribute to dust accumulation on panels. To mitigate these issues, several preventative measures can be taken 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 remove dust and debris. - Consider installing a monitoring system to quickly identify and address any drops in efficiency. By taking these precautions, solar installations in Slawi can maximize their energy production potential and ensure long-term reliability in this ideal tropical location.

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 Slawi

Seasonal solar PV output for Latitude: -6.9797, Longitude: 109.1392 (Slawi, 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 Slawi, Indonesia

To maximize your solar PV system's energy output in Slawi, Indonesia (Lat/Long -6.9797, 109.1392) 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 Slawi, 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 Slawi, 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	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 Slawi, 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 Slawi, 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 Slawi, Indonesia

The topography around Slawi, Indonesia, is characterized by a diverse landscape that transitions from coastal lowlands to more elevated terrain as you move inland. Slawi itself is situated in a relatively flat area, surrounded by gently rolling hills and agricultural land. To the north, the terrain gradually slopes towards the Java Sea, with expansive coastal plains and wetlands dominating the landscape. As you move south from Slawi, the terrain becomes increasingly hilly and mountainous. This area is part of the central mountain range that runs along the spine of Java Island. The hills surrounding Slawi are generally not very steep, making them suitable for agriculture and human settlement. Many of these hills are covered with a mix of forests, plantations, and terraced fields.

Potential Areas for Large-Scale Solar PV

When considering areas nearby that would be most suited to large-scale solar photovoltaic (PV) installations, several factors come into play. The ideal locations would have ample sunlight exposure, relatively flat terrain, and be easily accessible for construction and maintenance. The coastal plains to the north of Slawi present a promising option for solar PV development. These areas offer vast, open spaces with minimal shading from natural features or buildings. The flat terrain would simplify construction and reduce costs associated with land preparation. Additionally, the proximity to the coast ensures consistent sunlight exposure throughout the year. Another suitable area for solar PV installations would be the gently sloping hills to the south and southeast of Slawi. While not as flat as the coastal plains, these areas still offer favorable conditions for solar energy production. The slight inclination of the land can actually be advantageous, as it allows for optimal panel positioning to capture maximum sunlight. Moreover, these elevated areas are less prone to flooding, which is an important consideration for long-term infrastructure projects. It's worth noting that while the mountainous regions further south may receive ample sunlight, their steep terrain and dense vegetation make them less ideal for large-scale solar developments. The costs and environmental impact associated with clearing such areas would likely outweigh the benefits. In conclusion, the diverse topography around Slawi offers several promising locations for solar PV projects. The coastal plains to the north and the gently sloping hills to the south and southeast appear to be the most suitable areas, balancing favorable terrain with good sun exposure and accessibility.

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.