Solar Energy Potential in Niiza, Saitama, Japan

Niiza, Saitama, Japan, located at coordinates 35.7963, 139.5626 in the Northern Temperate Zone, offers good conditions for solar energy production throughout the year, though with notable seasonal variations. The solar production pattern in Niiza shows strong performance during summer months, with an average daily output of 5.27kWh per kW of installed capacity. Spring nearly matches this performance with 5.22kWh/day. Production decreases significantly during autumn and winter, dropping to 3.56kWh/day and 3.44kWh/day respectively. This seasonal pattern makes late spring through early autumn the ideal period for solar energy generation in Niiza. During these months, longer days and more direct sunlight create optimal conditions for photovoltaic systems to operate at their highest efficiency.

Optimal Panel Installation

For fixed solar panel installations in Niiza, Saitama, the ideal tilt angle is 33 degrees facing South. This specific angle has been calculated to maximize year-round energy production based on Niiza's latitude and seasonal solar patterns. This orientation allows panels to capture the most sunlight throughout the year, balancing the lower winter sun angles with higher summer sun positions.

Environmental Considerations

Several environmental factors could potentially impact solar production in Niiza:

• Seasonal rainfall and humidity, particularly during Japan's rainy season (typically June), can reduce solar efficiency by blocking direct sunlight
• Occasional typhoons in late summer and early autumn may cause physical damage to installations if not properly secured
• Winter snowfall, though typically light in Niiza, Saitama, can temporarily cover panels and reduce output
• Air pollution from the greater Tokyo metropolitan area may slightly reduce solar irradiance

Preventative Measures

To maximize solar production despite these challenges, consider implementing these preventative measures:

• Install panels with sufficient tilt (the recommended 33 degrees) to facilitate natural snow and rain runoff
• Use high-quality mounting systems designed to withstand typhoon-force winds
• Consider self-cleaning panel coatings or regular maintenance schedules to address dust and pollution buildup
• Install micro-inverters or power optimizers to minimize the impact of partial shading from nearby buildings or trees
• Implement a monitoring system to quickly identify and address any performance issues

With proper installation and maintenance, solar PV systems in Niiza can provide reliable renewable energy throughout the year, with particularly strong performance during the spring and summer months.

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

Link: Solar PV potential in Japan by location

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

Seasonal solar PV output for Latitude: 35.7963, Longitude: 139.5626 (Niiza, Japan), 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 33° South in Niiza, Japan

To maximize your solar PV system's energy output in Niiza, Japan (Lat/Long 35.7963, 139.5626) throughout the year, you should tilt your panels at an angle of 33° 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 Niiza, Japan

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 Niiza, Japan. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 33° 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	42° South in Autumn	51° South in Winter	29° 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 Niiza, Japan

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 Niiza, Japan.

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 Niiza, Japan

Niiza is a city located in Saitama Prefecture, Japan, positioned on the Musashino Plateau which forms part of the Kantō Plain. This region features a generally flat to gently rolling landscape with subtle elevation changes. The topography around Niiza is characterized by its relatively level terrain, with an average elevation of approximately 20-30 meters above sea level. The area was historically shaped by ancient river deposits from the nearby Arakawa River system, resulting in fertile soils across much of the region. The landscape surrounding Niiza is predominantly urbanized, with dense residential and commercial development stretching across much of the immediate vicinity. Despite this urbanization, the underlying terrain maintains its generally flat character with occasional shallow valleys and modest hills. These subtle topographic variations are more noticeable in the western portions of the region where the land gradually rises toward the distant mountains.

Surrounding Topographic Features

To the east of Niiza lies the vast Tokyo metropolitan area, situated on the extensive Kantō Plain which continues with minimal elevation change. The western direction eventually leads toward the foothills of the mountainous regions of central Honshu, though these are quite distant from Niiza itself. The northern areas of Saitama Prefecture gradually rise in elevation, while southern regions transition toward Tokyo Bay. Small rivers and drainage channels cross the area, creating minor valleys and riparian corridors that introduce subtle variations to the otherwise flat landscape. The Arakawa River, one of the major waterways in the region, flows several kilometers east of Niiza, with its broad floodplain creating one of the few significant topographic features in the vicinity.

Solar PV Potential Areas

For large-scale solar photovoltaic installations near Niiza, several factors related to topography must be considered. The most suitable areas would be those combining favorable terrain with appropriate land availability. Given these considerations, the following regions near Niiza show promise: The northern portions of Saitama Prefecture, where urban density decreases and more open land becomes available, offer potential for larger installations. These areas maintain the favorable flat terrain characteristic of the region while providing more extensive land parcels. Former agricultural lands on the Musashino Plateau that have been retired from production represent another opportunity. These parcels typically feature level ground with good drainage and minimal shading concerns, making them technically suitable for solar development. The broader Kanto Plain extending eastward contains scattered industrial zones and transitional spaces that could accommodate large solar installations. These areas benefit from the predominantly flat topography which minimizes site preparation costs and engineering challenges. Western Saitama Prefecture, where the terrain begins to show more variation with gentle hills, might offer south-facing slopes that could potentially increase solar capture efficiency. However, these areas would require more significant site engineering than the flatter regions. It's important to note that while the topography around Niiza is generally favorable for solar PV from a purely physical perspective, the intense urban development and high population density create significant constraints on land availability. The most practical large-scale solar developments would likely need to be situated in the peripheral regions where Saitama Prefecture transitions to less densely populated areas, or potentially on repurposed industrial lands where larger contiguous parcels might be available.

Japan solar PV Stats as a country

Japan ranks 3rd in the world for cumulative solar PV capacity, with 74,191 total MW's of solar PV installed. This means that 8.30% of Japan's total energy as a country comes from solar PV (that's 9th in the world). Each year Japan is generating 590 Watts from solar PV per capita (Japan ranks 4th in the world for solar PV Watts generated per capita). [source]

Are there incentives for businesses to install solar in Japan?

Yes, there are several incentives for businesses wanting to install solar energy in Japan. These include the Feed-in Tariff (FIT) program, which provides a fixed price for electricity generated from renewable sources such as solar; subsidies and grants from local governments; tax credits; and loans with low interest rates. Additionally, businesses may be eligible for additional incentives depending on their location and type of installation.

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