Haiphong, Vietnam, located at latitude 20.8559 and longitude 106.6697, presents a favorable environment for solar energy production throughout the year. This tropical location benefits from consistent sunlight, with seasonal variations primarily characterized by wet and dry periods rather than dramatic temperature changes.

Seasonal Solar Performance

Solar panel efficiency in Haiphong varies across the meteorological seasons. Summer stands out as the most productive period, with an impressive daily output of 5.74 kWh per kW of installed solar capacity. Spring follows as the second most efficient season, generating 4.33 kWh/day. Autumn sees a slight decrease in production at 4.06 kWh/day, while winter experiences the lowest output at 3.54 kWh/day. These figures indicate that Haiphong maintains relatively strong solar potential year-round, with summer being the optimal time for energy generation. The consistent sunlight in this tropical region contributes to a steady solar production, even during less favorable seasons.

Optimal Panel Positioning

For fixed solar panel installations in Haiphong, the ideal tilt angle to maximize year-round energy production is 18 degrees facing South. This angle has been calculated to optimize solar capture throughout the year, taking into account the location's latitude and the Earth's elliptical orbit.

Environmental Considerations

While Haiphong's tropical climate is generally conducive to solar energy production, there are some environmental factors to consider: 1. High humidity and rainfall: The region's wet seasons can lead to increased cloud cover and rainfall, potentially reducing solar efficiency. To mitigate this, panels should be installed with proper drainage and cleaning systems. 2. Tropical storms: Haiphong's coastal location makes it susceptible to tropical storms and typhoons. Robust mounting systems and wind-resistant panel designs are crucial to ensure durability and maintain production during adverse weather conditions. 3. Air pollution: As an industrial port city, Haiphong may experience air pollution, which can accumulate on solar panels and reduce their efficiency. Regular cleaning and maintenance schedules should be implemented to address this issue. By taking these factors into account and implementing appropriate preventative measures, solar installations in Haiphong can maximize their energy production potential and take full advantage of the region's favorable solar conditions.

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 160 locations across Vietnam. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.

Link: Solar PV potential in Vietnam by location

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

Seasonal solar PV output for Latitude: 20.8559, Longitude: 106.6697 (Haiphong, Vietnam), 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 18° South in Haiphong, Vietnam

To maximize your solar PV system's energy output in Haiphong, Vietnam (Lat/Long 20.8559, 106.6697) throughout the year, you should tilt your panels at an angle of 18° 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 Haiphong, Vietnam

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 Haiphong, Vietnam. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 18° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
5° South in Summer	26° South in Autumn	36° South in Winter	13° 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 Haiphong, Vietnam

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 Haiphong, Vietnam.

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 Haiphong, Vietnam

The topography around Haiphong, Vietnam, is characterized by a diverse landscape that transitions from coastal lowlands to more elevated terrain as you move inland. Haiphong itself is situated in the Red River Delta region, which is predominantly flat and low-lying. The city and its immediate surroundings are close to sea level, with many areas only a few meters above it.

As you move away from the coast, the terrain gradually becomes more varied. To the north and northeast of Haiphong, the land begins to rise, forming rolling hills and small mountains. This area is part of the larger Quang Ninh highlands region. To the west and southwest, the landscape remains relatively flat, as it's still part of the expansive Red River Delta.

The coastline near Haiphong features numerous small islands and islets, creating a complex maritime environment. These islands vary in size and elevation, with some being quite flat and others having more rugged, hilly profiles.

Regarding areas suitable for large-scale solar PV installations, the flat terrain of the Red River Delta to the west and southwest of Haiphong would be most appropriate. These areas offer several advantages for solar energy development:

1. The flat landscape allows for easier construction and maintenance of solar panels.
2. There are fewer natural obstacles that could cast shadows on the panels, maximizing sun exposure.
3. The region's agricultural nature means there may be large, open spaces available for development.
4. The proximity to Haiphong's industrial areas could make power distribution more efficient.

However, it's important to note that the Red River Delta is also prime agricultural land, so any large-scale solar projects would need to be carefully planned to balance energy production with food security concerns. Additionally, the region's vulnerability to flooding and tropical storms should be taken into account when designing and locating solar installations.

The hilly areas to the north and northeast, while less ideal for expansive solar farms due to their uneven terrain, could potentially accommodate smaller-scale installations on south-facing slopes. These locations might be suitable for distributed solar projects that could supplement the larger installations in the flatter regions.

Vietnam solar PV Stats as a country

Vietnam ranks 9th in the world for cumulative solar PV capacity, with 16,660 total MW's of solar PV installed. Each year Vietnam is generating 171 Watts from solar PV per capita (Vietnam ranks 30th in the world for solar PV Watts generated per capita). [source]

Are there incentives for businesses to install solar in Vietnam?

Yes, there are several incentives for businesses wanting to install solar energy in Vietnam. The government has implemented a number of policies and programs to encourage the development of renewable energy sources, including solar energy. These include tax exemptions, preferential loans, and feed-in tariffs for electricity generated from solar power plants. Additionally, the government has established a Renewable Energy Development Fund to provide financial support for projects related to renewable energy sources such as solar power.

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