Koga, Ibaraki, Japan, situated at latitude 36.1672° N and longitude 139.719° E, presents a moderately favorable location for solar PV energy generation throughout the year. Located in the Northern Temperate Zone, this area experiences distinct seasonal variations in solar energy production.

Seasonal Solar Performance

Solar energy output in Koga follows a predictable pattern aligned with the seasons. Spring and summer are the most productive periods, with daily outputs of 5.17 kWh and 5.09 kWh per kW of installed solar capacity, respectively. These seasons offer longer daylight hours and more direct sunlight, maximizing energy generation potential.

Autumn and winter see a noticeable decrease in solar productivity. Autumn yields 3.46 kWh per day, while winter drops to 3.08 kWh. This reduction is due to shorter days, lower sun angles, and potentially increased cloud cover during these seasons.

Optimal Panel Installation

To maximize year-round solar energy production in Koga, Ibaraki, fixed solar panels should be installed at a tilt angle of 33 degrees facing south. This angle optimizes the panels' exposure to sunlight throughout the year, balancing the varying sun positions across seasons.

Environmental Considerations

While Koga's climate is generally conducive to solar energy production, there are some environmental factors to consider:

• Seasonal rainfall: Japan experiences a rainy season, typically from June to July, which could temporarily reduce solar output.
• Snow accumulation: Winter snowfall, though not extreme, may occasionally cover panels and reduce efficiency.

To mitigate these issues, consider installing panels at a steeper angle to promote self-cleaning and snow shedding. Additionally, regular maintenance and cleaning schedules can help ensure optimal performance year-round.

In conclusion, while Koga may not be an ideal location for solar energy production compared to sunnier regions, it still offers a viable opportunity for sustainable energy generation, particularly during 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 Koga

Seasonal solar PV output for Latitude: 36.1672, Longitude: 139.719 (Koga, 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 Koga, Japan

To maximize your solar PV system's energy output in Koga, Japan (Lat/Long 36.1672, 139.719) 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 Koga, 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 Koga, 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	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 Koga, 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 Koga, 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 Koga, Japan

The area surrounding Koga, Japan, located at approximately 36.1672°N latitude and 139.719°E longitude, is characterized by a diverse topography that transitions from flat lowlands to gently rolling hills. Koga itself is situated in the Kanto Plain, one of Japan's largest and most populous flat areas. This region is known for its expansive agricultural lands and urban developments. To the east and southeast of Koga, the terrain remains predominantly flat, with numerous rice paddies and other agricultural fields dominating the landscape. This area is part of the broader Kanto Plain, which extends towards Tokyo Bay. The flat nature of this terrain is due to centuries of sediment deposition from rivers flowing through the region. As one moves westward from Koga, the landscape gradually becomes more undulating. Low hills begin to appear, creating a subtle transition between the flat plains and the more mountainous regions further west. These hills are typically covered with a mix of forests, small farms, and residential areas.

Potential for Large-Scale Solar PV

When considering areas nearby Koga that would be most suited for large-scale solar photovoltaic (PV) installations, several factors come into play. The ideal locations would offer ample sunlight exposure, relatively flat terrain for easier installation, and proximity to existing infrastructure. The flat agricultural lands to the east and southeast of Koga present promising opportunities for solar PV development. These areas benefit from minimal shading due to the lack of significant elevation changes, allowing for maximum sunlight exposure throughout the day. The existing road network in this region would also facilitate the transportation of materials and maintenance access. However, it's important to note that the use of productive agricultural land for solar installations may face resistance due to food security concerns. As such, developers might need to explore dual-use solutions that allow for both agriculture and solar energy production on the same land. The gently rolling hills to the west of Koga could also be suitable for solar PV installations, particularly on south-facing slopes. These areas might offer a good balance between land availability and minimal impact on prime agricultural lands. The slightly elevated terrain could potentially reduce the risk of flooding, which is a consideration in the low-lying plains. In conclusion, while the flat areas east and southeast of Koga offer the most straightforward terrain for large-scale solar PV, a comprehensive assessment considering land use, environmental impact, and local regulations would be necessary to determine the most appropriate locations for such developments.

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!

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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.