Kailali, Sudurpashchim Pradesh, Nepal presents a moderately favorable location for year-round solar PV energy generation, though with notable seasonal variations that potential solar installers should carefully consider.

Seasonal Solar Performance

The solar energy output at this Northern Sub Tropical location shows significant seasonal fluctuation. Spring emerges as the peak season with an impressive 6.57kWh per day per kW of installed solar capacity, making it the ideal time for maximum energy generation. Summer follows as the second-best performing season at 5.02kWh per day per kW, while autumn maintains reasonable productivity at 4.71kWh per day per kW. Winter presents the most challenging period for solar generation, dropping to just 3.53kWh per day per kW of installed capacity. This represents nearly a 46% reduction compared to spring output, which installers must account for in their energy planning and system sizing calculations.

Optimal Panel Configuration

For fixed panel installations at Kailali, Sudurpashchim Pradesh, the ideal tilt angle is 26 degrees facing south to maximize total year-round solar production. This angle has been calculated using weighted daily solar elevation data and accounts for Earth's elliptical orbit patterns throughout the year.

Environmental and Weather Challenges

Several significant local factors could impede solar production at this location:

• Monsoon season dust and debris accumulation on panels
• High humidity levels affecting panel efficiency
• Potential for severe weather events including hail and strong winds
• Air pollution from agricultural burning and regional industrial activities

Preventative Measures

To ensure optimal energy production despite these challenges, several installation strategies should be implemented:

• Install robust mounting systems designed to withstand monsoon winds and potential hail damage
• Implement regular cleaning schedules, particularly during and after dust-heavy periods
• Use anti-reflective coatings and self-cleaning panel technologies where budget permits
• Ensure adequate ventilation around panels to combat humidity-related efficiency losses
• Consider micro-inverters or power optimizers to minimize impact of partial shading from dust or debris

Overall, while Kailali offers decent solar potential, the substantial seasonal variation and environmental challenges require careful system design and maintenance planning to achieve optimal performance throughout the year.

Note: The Northern Sub Tropics extend from 23.5° latitude North up to 35° latitude.

So far, we have conducted calculations to evaluate the solar photovoltaic (PV) potential in 40 locations across Nepal. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.

Link: Solar PV potential in Nepal by location

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

Seasonal solar PV output for Latitude: 28.6189, Longitude: 80.7923 (Kailali, Nepal), 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 26° South in Kailali, Nepal

To maximize your solar PV system's energy output in Kailali, Nepal (Lat/Long 28.6189, 80.7923) throughout the year, you should tilt your panels at an angle of 26° 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 Kailali, Nepal

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 Kailali, Nepal. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 26° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
12° South in Summer	34° South in Autumn	43° South in Winter	22° 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 Kailali, Nepal

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 Kailali, Nepal.

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 Kailali, Nepal

Topographical Features of Kailali District

The Kailali district in Nepal's far-western region presents a diverse topographical landscape that transitions from the flat Terai plains in the south to the rising foothills of the Himalayas in the north. This area sits within the Mahakali Zone and forms part of the broader Indo-Gangetic Plain system, characterized by fertile alluvial deposits and relatively gentle terrain across much of its southern extent.

The southern portions of Kailali feature expansive flatlands with minimal elevation changes, creating vast stretches of agricultural territory. These plains gradually give way to undulating terrain as they approach the Churia Hills, also known as the Siwalik Range, which form the first major topographical barrier moving northward. The Churia Hills create a series of ridges and valleys with moderate slopes, representing the transitional zone between the flat Terai and the more mountainous regions beyond.

Moving further north, the landscape becomes increasingly rugged as it approaches the Middle Hills region. Here, the terrain features steeper gradients, deeper valleys, and more pronounced elevation changes. The area is intersected by several river systems, including tributaries of the Karnali River, which have carved distinctive drainage patterns through the landscape over geological time.

Climate and Environmental Conditions

The region experiences a subtropical climate with distinct wet and dry seasons. The monsoon period brings substantial rainfall, particularly affecting the northern hilly areas, while the winter months tend to be dry with clear skies. The flat southern areas experience less variation in weather patterns compared to the more elevated northern sections, where altitude begins to influence local climate conditions.

Vegetation patterns reflect the topographical diversity, with tropical and subtropical forests covering the hillier northern areas, while the southern plains support extensive agricultural activities and grasslands. The varying elevation creates different microclimates across the district, influencing both natural vegetation and agricultural practices.

Optimal Areas for Large-Scale Solar Development

The southern Terai plains of Kailali present the most favorable conditions for large-scale solar photovoltaic installations. These areas offer extensive flat terrain that requires minimal site preparation and grading, significantly reducing construction costs and complexity. The relatively stable ground conditions in these plains provide excellent foundations for solar mounting systems, while the open landscape minimizes shading concerns from natural topographical features.

The agricultural areas within the southern plains could potentially accommodate solar installations through agrivoltaic approaches or on marginal lands not suitable for intensive farming. These locations benefit from excellent accessibility via existing road networks that connect to major transportation corridors, facilitating both construction logistics and ongoing maintenance operations.

Areas near the transition zone between the plains and the Churia Hills may also present opportunities, particularly on gentle south-facing slopes that could optimize solar exposure while still maintaining reasonable construction feasibility. However, these locations would require more careful site assessment to ensure slope stability and appropriate drainage.

The more mountainous northern regions, while potentially receiving good solar exposure on properly oriented slopes, present significant challenges for large-scale development due to steep terrain, difficult access, and higher construction costs. These areas would be better suited to smaller, distributed solar installations rather than utility-scale projects.

Transportation infrastructure accessibility remains a crucial factor, with the southern plains benefiting from proximity to the East-West Highway and other major roads that facilitate equipment transport and grid connectivity. The flat terrain also simplifies the installation of electrical infrastructure needed to connect solar facilities to the national power grid.

Nepal solar PV Stats as a country

Nepal ranks 89th in the world for cumulative solar PV capacity, with 93 total MW's of solar PV installed. This means that 0.10% of Nepal's total energy as a country comes from solar PV (that's 43rd in the world). Each year Nepal is generating 3 Watts from solar PV per capita (Nepal ranks 86th in the world for solar PV Watts generated per capita). [source]

Are there incentives for businesses to install solar in Nepal?

Yes, there are incentives for businesses wanting to install solar energy in Nepal. The Government of Nepal has implemented a number of policies and programs to promote the use of renewable energy sources such as solar power. These include tax exemptions, subsidies, and other financial incentives for businesses that install solar systems. Additionally, the government has established a Renewable Energy Fund which provides grants to support research and development activities related to renewable energy technologies.

Do you have more up to date information than this on incentives towards solar PV projects in Nepal? 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.