Bhadrapur, Koshi, 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 Tropics location shows significant fluctuation throughout the year. Spring emerges as the most productive season, generating 5.41kWh per day per kW of installed solar capacity. This represents the peak performance period when solar panels will deliver their highest energy yields. Autumn follows as the second-best performing season at 4.49kWh per day per kW, while summer produces 4.14kWh per day per kW. Winter presents the most challenging conditions for solar generation, dropping to 3.66kWh per day per kW of installed capacity.

Optimal Panel Configuration

For fixed panel installations at Bhadrapur, Koshi, the ideal tilt angle to maximize total year-round solar production is 25 degrees facing south. This angle has been calculated to optimize energy capture across all seasons by accounting for the sun's varying elevation throughout the year and weighting these angles against actual solar potential using NASA solar irradiance data.

Environmental and Weather Challenges

Several significant local factors could impede solar production at this location and require careful consideration during installation planning. The monsoon season represents the primary challenge for solar installations in Bhadrapur. Nepal's monsoon period typically brings heavy rainfall, high humidity, and extensive cloud cover that can substantially reduce solar energy generation. The monsoon's timing likely contributes to the lower winter solar output observed at this location. Dust and particulate matter accumulation on solar panels poses another significant concern. The region's agricultural activities, unpaved roads, and seasonal dust storms can create a film on panel surfaces that reduces light transmission and decreases energy output. High humidity levels throughout much of the year can lead to moisture-related issues, including potential corrosion of electrical components and reduced panel efficiency.

Preventative Measures for Enhanced Performance

Several installation strategies can help mitigate these environmental challenges and improve solar energy production:

• Install panels with adequate spacing and ventilation to promote air circulation and reduce moisture buildup
• Use high-quality, corrosion-resistant mounting hardware and electrical components rated for high-humidity environments
• Implement a regular cleaning schedule, particularly during dry seasons, to remove dust and debris accumulation
• Consider installing panels at steeper angles than the optimal 25 degrees in areas prone to dust accumulation, as this can help with self-cleaning during rainfall
• Ensure proper drainage around panel installations to prevent water pooling and moisture problems

Regular maintenance becomes particularly crucial at this location. Monthly visual inspections and quarterly professional cleaning can help maintain optimal performance levels throughout the year.

Overall Assessment

Despite the seasonal variations and environmental challenges, Bhadrapur offers reasonable potential for solar PV installations. The strong spring and autumn performance helps offset the reduced winter generation, while proper installation techniques and maintenance practices can effectively address most environmental concerns. The location's year-round solar generation capability makes it suitable for both grid-tied and off-grid solar applications, provided that system sizing accounts for the seasonal variations in output.

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 Bhadrapur

Seasonal solar PV output for Latitude: 26.5439, Longitude: 88.1005 (Bhadrapur, 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 25° South in Bhadrapur, Nepal

To maximize your solar PV system's energy output in Bhadrapur, Nepal (Lat/Long 26.5439, 88.1005) throughout the year, you should tilt your panels at an angle of 25° 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 Bhadrapur, 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 Bhadrapur, Nepal. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 25° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
10° South in Summer	32° South in Autumn	42° South in Winter	21° 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 Bhadrapur, 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 Bhadrapur, 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 Bhadrapur, Nepal

Topographical Features Around Bhadrapur

Bhadrapur sits in the southeastern corner of Nepal, positioned in the fertile Terai plains near the borders with India and Bangladesh. This region represents one of Nepal's flattest areas, characterized by gently rolling lowlands that stretch across the southern portion of the country. The elevation around Bhadrapur remains relatively modest, typically ranging between 100 to 300 meters above sea level, creating an expansive landscape of agricultural fields and scattered settlements.

The terrain immediately surrounding Bhadrapur consists primarily of alluvial plains formed by centuries of sediment deposits from rivers flowing down from the Himalayan foothills to the north. These plains create broad, open expanses with minimal elevation changes, interrupted occasionally by small hills and river valleys. The Mechi River flows through this region, creating some gentle undulations in the otherwise flat topography as it meanders toward the Ganges basin.

Moving northward from Bhadrapur, the landscape gradually transitions into the Siwalik Hills, also known as the Churia Range. These foothills of the Himalayas introduce more pronounced elevation changes and steeper slopes, though they remain relatively modest compared to the towering peaks further north. The Siwalik Hills create a series of ridges and valleys that run roughly east-west across the region.

Optimal Areas for Large-Scale Solar Development

The expansive Terai plains surrounding Bhadrapur present exceptional opportunities for large-scale solar photovoltaic installations. The flat to gently rolling terrain south and southwest of the city offers vast stretches of relatively unused land that would require minimal grading or site preparation for solar arrays. These areas benefit from unobstructed southern exposure and minimal shading from natural features.

Agricultural areas with lower productivity could potentially serve dual purposes, allowing for agrivoltaic systems where solar panels are installed above crops or grazing land. The open nature of the Terai plains means that large solar installations would face few topographical constraints, enabling efficient panel spacing and maintenance access roads.

Areas closer to existing transmission infrastructure would prove most practical for development, particularly those near the main transportation corridors that connect Bhadrapur to larger population centers. The relatively stable geology of the alluvial plains provides solid foundations for mounting systems, while the minimal slope reduces concerns about erosion or drainage issues that might affect panel performance.

The region's position away from the immediate Himalayan foothills means reduced concerns about landslides or dramatic weather patterns that can affect mountainous areas. However, developers should consider seasonal flooding patterns associated with monsoon rains, as the flat terrain can experience temporary inundation during heavy rainfall periods. Selecting sites with adequate drainage and slight elevation advantages would help mitigate these concerns while maintaining the benefits of the region's favorable topography.

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.