Hetauda, Bagmati Province, Nepal presents a moderately favorable location for year-round solar PV energy generation, though with some seasonal variations that potential installers should consider.

Seasonal Solar Performance

The solar energy output at this Northern Sub Tropical location shows interesting seasonal patterns. Spring emerges as the most productive season, delivering 6.07kWh per day per kW of installed solar capacity. This represents the peak performance period when solar panels will generate their maximum electricity output. Summer and autumn maintain fairly consistent production levels at 4.63kWh/day and 4.64kWh/day respectively. Winter shows the lowest output at 4.34kWh/day per kW, though this reduction is relatively modest compared to many other locations at similar latitudes.

Optimal Panel Installation

For fixed panel installations at Hetauda, Bagmati Province, the ideal tilt angle is 26 degrees facing south. This angle maximizes total year-round solar production by optimizing the panels' exposure to sunlight throughout all seasons.

Local Environmental Factors

Several environmental and weather factors in the Hetauda region could potentially impact solar energy production:

• Monsoon season brings heavy rainfall and extended cloud cover, particularly affecting summer production despite longer daylight hours
• High humidity levels can reduce solar panel efficiency and create maintenance challenges
• Dust accumulation from unpaved roads and construction activities common in developing areas
• Potential air pollution from nearby industrial activities and vehicle emissions

Preventative Measures for Optimal Performance

To maximize solar energy production despite these challenges, several installation strategies prove effective:

• Install panels with adequate spacing and ventilation to combat humidity-related efficiency losses
• Implement regular cleaning schedules, particularly during dry seasons when dust accumulation peaks
• Use anti-reflective coatings and hydrophobic treatments to help panels self-clean during rain
• Design mounting systems with appropriate drainage to prevent water pooling
• Consider micro-inverters or power optimizers to minimize impact when individual panels are shaded or dirty

Despite these considerations, Hetauda's location offers reasonable solar potential throughout the year, with the significant spring peak helping to balance the modest winter reduction 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 Hetauda

Seasonal solar PV output for Latitude: 27.4284, Longitude: 85.0322 (Hetauda, 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 Hetauda, Nepal

To maximize your solar PV system's energy output in Hetauda, Nepal (Lat/Long 27.4284, 85.0322) 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 Hetauda, 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 Hetauda, 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
11° South in Summer	33° South in Autumn	43° 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 Hetauda, 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 Hetauda, 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 Hetauda, Nepal

Topographical Features of Hetauda

Hetauda sits in the Makwanpur district of central Nepal, positioned strategically in the Inner Terai region at the foothills of the Mahabharat Range. The city occupies a transitional zone between the flat plains of the Terai to the south and the rising hills that eventually lead to Nepal's high mountains. This location places Hetauda at a moderate elevation, creating a landscape characterized by gently rolling terrain interspersed with flatter agricultural areas.

The topography around Hetauda features a mix of cultivated valleys, scattered settlements, and gradually ascending hillsides. The Rapti River system influences much of the local geography, creating fertile alluvial deposits in the lower-lying areas while carving gentle valleys through the landscape. To the north and east, the terrain becomes increasingly hilly as it approaches the Mahabharat Range, while southward the land gradually flattens toward the main Terai plains.

The region experiences a subtropical climate with distinct wet and dry seasons, supporting diverse vegetation patterns across different elevations. Lower areas typically feature agricultural land use, including rice paddies and other crops, while the hillsides often contain mixed forests and terraced farming plots.

Optimal Areas for Large-Scale Solar Development

The most suitable locations for large-scale solar photovoltaic installations around Hetauda would be the relatively flat to gently sloping areas found primarily to the south and southwest of the city. These zones offer several advantages including minimal grading requirements, reduced installation costs, and easier access for construction and maintenance activities.

The agricultural plains extending toward the main Terai region present particularly attractive opportunities, as they provide extensive open areas with minimal topographical obstacles. These locations typically feature stable soil conditions and good drainage, both important factors for solar farm development. The gentle southward slope of much of this terrain also provides favorable orientation for solar panel positioning.

Areas along the broader valley floors, particularly those following the Rapti River system, offer additional potential sites. These locations benefit from relatively flat terrain while maintaining good accessibility via existing transportation networks. The river valleys also tend to have fewer trees and obstacles compared to the hillier terrain to the north.

The hillsides rising toward the Mahabharat Range would be less suitable for large-scale solar development due to their steeper gradients, which would require extensive site preparation and create challenges for panel installation and maintenance. Additionally, these elevated areas often feature denser vegetation and more complex land ownership patterns that could complicate development efforts.

Transportation infrastructure represents another crucial consideration, with areas closer to existing roads and the East-West Highway offering significant advantages for construction logistics and ongoing operations. The flatter terrain south of Hetauda generally provides better access to these transportation corridors compared to the more remote hillside locations.

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!

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.