Minamishinagawa, Japan presents a moderately favorable location for year-round solar energy generation, though with notable seasonal variations that potential solar installers should understand.

Seasonal Solar Performance

The solar energy output at this location shows strong seasonal patterns. Summer delivers the highest production at 5.27 kWh per day per kW of installed capacity, making it the peak season for solar generation. Spring follows closely with 5.24 kWh per day per kW, creating an excellent six-month period from roughly March through August for maximum energy harvest. Autumn and winter present more challenging conditions, with output dropping to 3.57 kWh and 3.44 kWh per day per kW respectively. This represents about a 35% reduction compared to peak summer performance, which is typical for locations in the Northern Temperate Zone. For optimal year-round performance, solar panels should be installed at a fixed tilt angle of 33 degrees facing south. This angle maximizes total annual energy production by balancing the sun's varying position throughout the seasons.

Local Environmental and Weather Challenges

Several factors specific to Minamishinagawa and the broader Tokyo region can significantly impact solar panel performance:

• Air pollution and urban smog: Tokyo's dense urban environment creates particulate matter that can accumulate on solar panels, reducing their efficiency
• Rainy season (Tsuyu): Japan's extended rainy period from June to July brings weeks of cloudy, humid conditions that substantially reduce solar output
• Typhoon season: Late summer and early autumn storms can damage installations and deposit debris on panels
• High humidity: Coastal proximity creates persistent moisture that can affect panel performance and accelerate component degradation
• Snow accumulation: Winter snow can completely block panels until it melts or is removed

Preventative Measures for Better Performance

To maximize solar energy production despite these challenges, several installation strategies prove effective: Regular cleaning schedules become essential in this urban environment. Monthly panel washing helps remove accumulated pollution, dust, and salt deposits from nearby Tokyo Bay. Installing panels with adequate spacing allows for proper air circulation, reducing humidity-related issues and making maintenance access easier. Structural reinforcement protects against typhoon damage. This includes using robust mounting systems rated for high winds and ensuring proper drainage to prevent water accumulation during heavy rains. Tilt optimization helps with natural cleaning, as the recommended 33-degree angle allows rain to wash away some debris while also shedding snow more effectively than flatter installations. Installing snow guards or heating elements may be worthwhile for critical installations. Consider micro-inverters or power optimizers rather than string inverters, as these can minimize the impact when individual panels are shaded or soiled. This technology ensures that problems with one panel don't significantly affect the entire system's output.

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 Minamishinagawa

Seasonal solar PV output for Latitude: 35.6164, Longitude: 139.7425 (Minamishinagawa, 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 Minamishinagawa, Japan

To maximize your solar PV system's energy output in Minamishinagawa, Japan (Lat/Long 35.6164, 139.7425) 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 Minamishinagawa, 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 Minamishinagawa, 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	41° South in Autumn	50° 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 Minamishinagawa, 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 Minamishinagawa, 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 Minamishinagawa, Japan

Topographical Features of Minamishinagawa

Minamishinagawa sits in the southeastern portion of Tokyo's Shinagawa ward, positioned along the western shore of Tokyo Bay. The area occupies relatively flat, low-lying terrain that is characteristic of much of Tokyo's coastal plain. This location places it at near sea level, with gentle elevations that rarely exceed 10-15 meters above the waterline. The topography reflects the broader geological pattern of the Kanto Plain, which was formed through centuries of sediment deposition from rivers flowing into Tokyo Bay.

The immediate landscape around Minamishinagawa is heavily urbanized, featuring a dense mixture of residential neighborhoods, commercial districts, and industrial facilities. The area benefits from its proximity to major transportation infrastructure, including railway lines and highways that connect it to central Tokyo and other metropolitan areas. The flat terrain has made it particularly suitable for large-scale development, resulting in a landscape dominated by buildings of varying heights, from low-rise residential structures to mid-rise commercial complexes.

Nearby Areas Suitable for Large-Scale Solar Installations

When considering locations near Minamishinagawa that would be most appropriate for extensive solar photovoltaic installations, several factors come into play including available space, minimal shading, and accessibility for maintenance. The artificial islands and reclaimed land areas of Tokyo Bay present some of the most promising opportunities in the region.

Haneda Airport's surrounding areas, located approximately 5-7 kilometers to the southwest, offer substantial flat surfaces with minimal obstruction. While the airport itself requires careful consideration due to aviation regulations, the broader Haneda area includes industrial zones and logistics facilities that could accommodate large solar arrays on rooftops or purpose-built ground installations.

The industrial waterfront districts extending south and east from Minamishinagawa toward Kawasaki present excellent potential for solar development. These areas feature numerous large warehouse complexes, manufacturing facilities, and logistics centers with expansive roof surfaces that receive consistent solar exposure throughout the day. The flat industrial landscape minimizes shading issues that commonly affect solar installations in more densely developed urban areas.

Reclaimed land areas along Tokyo Bay's western shore, particularly those used for port operations and heavy industry, offer significant opportunities for ground-mounted solar installations. These locations benefit from their coastal position, which typically provides good air circulation that helps maintain optimal operating temperatures for photovoltaic panels. The relatively open landscape of these industrial zones also reduces concerns about future development that might create shading problems.

Moving inland from the immediate coastal area, the broader Kawasaki industrial corridor presents additional opportunities. This region features a mixture of heavy industry, power generation facilities, and logistics operations spread across relatively flat terrain. Many of these facilities occupy large parcels of land with substantial roof areas or unused ground space that could accommodate solar installations while maintaining their primary industrial functions.

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.