Nagaoka, Niigata, Japan, situated at latitude 37.4506 and longitude 138.858, presents a mixed picture for solar energy generation throughout the year. This location in the Northern Temperate Zone experiences significant seasonal variations in solar output, which impacts the overall efficiency of photovoltaic (PV) systems.

Seasonal Solar Performance

Summer stands out as the most productive season for solar energy in Nagaoka, Niigata, with an impressive daily output of 5.82 kWh per kW of installed solar capacity. Spring follows closely behind, generating 4.98 kWh/day. These seasons offer ideal conditions for maximizing solar energy production.

However, the performance dips considerably during autumn and winter. Autumn sees a moderate decline to 3.54 kWh/day, while winter experiences a significant drop to just 1.94 kWh/day. This substantial seasonal variation highlights the challenges of maintaining consistent energy production throughout the year.

Optimal Panel Installation

For those considering a fixed panel installation in Nagaoka, Niigata, the ideal tilt angle to maximize year-round solar production is 32 degrees facing South. This angle has been carefully calculated to balance the seasonal variations and optimize overall energy capture.

Environmental Considerations

Nagaoka's climate presents some challenges for solar energy production. The region experiences significant snowfall during winter months, which can cover solar panels and reduce their efficiency. To mitigate this issue, installers should consider using steeper tilt angles or snow-shedding systems to prevent snow accumulation on panels.

Additionally, Nagaoka is subject to occasional heavy rainfall and typhoons, particularly during late summer and early autumn. These weather events can temporarily reduce solar output and potentially damage poorly secured installations. Robust mounting systems and weather-resistant panels are crucial to ensure longevity and consistent performance.

Maximizing Production

To optimize solar energy generation in Nagaoka, Niigata, consider the following measures:

• Implement a dual-axis tracking system to follow the sun's path, potentially increasing energy yield by up to 30%.
• Use high-efficiency panels designed for low-light conditions to improve performance during cloudy days and winter months.

While Nagaoka's location presents some challenges for year-round solar energy production, proper system design and preventative measures can help maximize the potential of solar PV installations in this region.

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 Nagaoka

Seasonal solar PV output for Latitude: 37.4506, Longitude: 138.858 (Nagaoka, 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 32° South in Nagaoka, Japan

To maximize your solar PV system's energy output in Nagaoka, Japan (Lat/Long 37.4506, 138.858) throughout the year, you should tilt your panels at an angle of 32° 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 Nagaoka, 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 Nagaoka, Japan. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 32° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
21° South in Summer	42° South in Autumn	51° South in Winter	30° 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 Nagaoka, 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 Nagaoka, 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 Nagaoka, Japan

Nagaoka, Japan, situated at latitude 37.4506 and longitude 138.858, is characterized by a diverse and complex topography. The city is nestled in the heart of Niigata Prefecture, surrounded by a mix of mountainous terrain, river valleys, and coastal plains. This varied landscape is a result of the region's geological history and its location along the western coast of Honshu, Japan's main island. The city itself is primarily located in the Chūetsu region, which is known for its undulating hills and expansive rice fields. To the east of Nagaoka, the terrain gradually rises into the foothills of the Echigo Mountains, part of the larger Japanese Alps system. These mountains create a dramatic backdrop to the city, with peaks reaching heights of over 2,000 meters in some areas. The mountainous landscape is carved by numerous rivers and streams, creating deep valleys and gorges that add to the region's scenic beauty. To the west of Nagaoka, the land gently slopes towards the Sea of Japan coast. This area is characterized by a mix of lowland plains and rolling hills, with the Shinano River—Japan's longest river—meandering through the landscape before emptying into the sea. The river's floodplain has created fertile agricultural land, which is extensively used for rice cultivation, a staple of the local economy.

Potential for Large-Scale Solar PV

When considering areas suitable for large-scale solar photovoltaic (PV) installations near Nagaoka, several factors must be taken into account. The ideal locations would offer ample sunlight exposure, relatively flat terrain, and minimal environmental impact. The coastal plains to the west of Nagaoka present promising opportunities for solar PV development. These areas benefit from fewer geographical obstructions, allowing for maximum sunlight exposure throughout the day. The generally flat terrain would simplify construction and maintenance of solar arrays, while the proximity to existing infrastructure could facilitate grid connection. Some of the gently sloping hillsides surrounding Nagaoka could also be suitable for solar PV installations. South-facing slopes, in particular, would receive optimal sunlight and could potentially accommodate large-scale projects. However, care must be taken to avoid areas of significant agricultural importance or ecological sensitivity. It's important to note that while the mountainous regions east of Nagaoka receive ample sunlight, their steep terrain and forested nature make them less suitable for large-scale solar developments. The challenges of construction and potential environmental impacts in these areas would likely outweigh the benefits. Any large-scale solar PV project in the region would need to carefully consider local climate conditions, including the region's significant snowfall in winter, which could affect solar panel efficiency and require specialized design considerations. Additionally, the seismic activity common to the area would necessitate robust structural engineering for any large-scale installation. In conclusion, while Nagaoka's varied topography presents some challenges for large-scale solar PV development, the coastal plains and some hillside areas offer potential sites that could be explored further, subject to detailed environmental and feasibility studies.

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.