Siliana, Tunisia offers excellent conditions for year-round solar energy generation, making it a highly favorable location for solar photovoltaic installations in North Africa.

Seasonal Solar Performance

The solar energy output at this location shows strong seasonal variation, with summer months delivering the highest production at 7.74 kWh per day per kW of installed solar capacity. Spring follows as the second-best season with 6.10 kWh per day per kW, while autumn produces 4.15 kWh per day per kW. Winter shows the lowest output at 3.13 kWh per day per kW, though this still represents reasonable production levels for solar installations. The ideal times for solar generation at Siliana are clearly during the summer and spring months, when the combination of longer days and higher sun angles maximize energy production. Even during the less productive autumn and winter periods, the location maintains sufficient solar output to justify year-round operation.

Optimal Panel Configuration

For fixed panel installations at Siliana, the ideal tilt angle is 31 degrees facing south to maximize total year-round solar production. This angle is calculated by analyzing daily solar elevation angles throughout the year and weighting them according to solar irradiance potential, accounting for Earth's elliptical orbit around the sun.

Environmental Factors and Mitigation Strategies

Several environmental factors in the Siliana region could potentially impact solar panel performance:

• Dust and Sand Accumulation: Tunisia's semi-arid climate and occasional desert winds can deposit dust and fine sand particles on solar panels, reducing their efficiency significantly
• High Summer Temperatures: Extreme heat during peak summer months can reduce panel efficiency, as photovoltaic cells typically lose efficiency as temperatures rise above optimal operating ranges
• Seasonal Rainfall Patterns: Limited rainfall during certain periods may reduce natural panel cleaning, allowing dust buildup to persist

To address these challenges, several preventative measures should be implemented during installation: Regular cleaning schedules are essential, particularly during dry periods when dust accumulation is highest. Installing automated cleaning systems or planning for frequent manual cleaning can maintain optimal panel performance. Ensuring adequate ventilation around panels helps manage heat buildup during summer months, while selecting panels with good high-temperature performance ratings is advisable. Proper mounting systems that allow for easy access during maintenance will facilitate regular cleaning and inspection. Installing panels with anti-reflective coatings designed for dusty environments can also help maintain efficiency between cleaning cycles. Despite these considerations, Siliana's location offers substantial solar energy potential throughout the year, with proper installation and maintenance practices ensuring optimal performance from solar photovoltaic systems.

Note: The Northern Temperate Zone extends from 35° latitude North up to 66.5° latitude.

So far, we have conducted calculations to evaluate the solar photovoltaic (PV) potential in 53 locations across Tunisia. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.

Link: Solar PV potential in Tunisia by location

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

Seasonal solar PV output for Latitude: 36.0855, Longitude: 9.3721 (Siliana, Tunisia), 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 31° South in Siliana, Tunisia

To maximize your solar PV system's energy output in Siliana, Tunisia (Lat/Long 36.0855, 9.3721) throughout the year, you should tilt your panels at an angle of 31° South 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 Siliana, Tunisia

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 Siliana, Tunisia. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 31° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
20° South in Summer	41° South in Autumn	51° South in Winter	28° South 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 Siliana, Tunisia

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 Siliana, Tunisia.

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 Siliana, Tunisia

Topographical Features of the Siliana Region

The area surrounding Siliana in north-central Tunisia presents a diverse landscape characterized by rolling hills, gentle valleys, and elevated plateaus. This region sits within the Tell Atlas mountain system, where the terrain gradually transitions from the more mountainous areas to the north toward the flatter plains that extend southward into the Sahel region of Tunisia. The immediate vicinity of Siliana features undulating topography with elevations ranging from approximately 400 to 800 meters above sea level. The landscape is dominated by sedimentary rock formations that have been shaped over millennia by erosion, creating a series of rounded hills separated by broad valleys. These valleys often contain seasonal watercourses that flow during the wetter winter months but may remain dry during the summer period. To the northwest of Siliana, the terrain becomes more pronounced with steeper slopes and deeper valleys as it approaches the higher elevations of the Tell Atlas range. Conversely, moving southeast from the city, the landscape gradually flattens into more expansive plains that characterize much of central Tunisia's agricultural heartland.

Vegetation and Land Use Patterns

The natural vegetation in the Siliana area consists primarily of Mediterranean scrubland and sparse woodland, with olive groves and agricultural fields occupying much of the cultivated land. The region experiences a semi-arid climate with dry summers and mild, wet winters, which influences both the natural vegetation patterns and agricultural practices. Agricultural activities dominate the land use, with cereal crops, olive cultivation, and livestock grazing being the primary economic activities. The rolling nature of the terrain means that farming often follows the contours of the hills, creating terraced fields on steeper slopes and larger agricultural plots in the valley bottoms.

Optimal Areas for Large-Scale Solar Development

The most suitable locations for large-scale solar photovoltaic installations in the Siliana region would be the relatively flat to gently sloping areas found in the broader valleys and on the plateau surfaces. These areas offer several advantages for solar development, including reduced construction costs due to minimal grading requirements and optimal panel orientation possibilities. The southeastern approaches to Siliana, where the terrain begins to flatten toward the central Tunisian plains, present particularly favorable conditions. These areas combine relatively level topography with good accessibility and proximity to existing infrastructure. The gentle slopes found on many of the plateau areas could also accommodate solar installations effectively, provided the gradient remains within acceptable parameters for panel mounting systems. Areas with southern-facing slopes of moderate gradient could also prove suitable, as they would naturally orient solar panels toward optimal sun exposure angles. However, the most economically viable locations would likely be the flatter valley floors and plateau surfaces where large arrays could be constructed with minimal terrain modification. The region's agricultural character means that site selection would need to balance solar development with existing land uses, potentially favoring areas of lower agricultural productivity or those currently used for extensive grazing rather than intensive crop cultivation.

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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.