Solar Energy Potential in Iwaizumi, Iwate, Japan

Iwaizumi, Iwate, located in northern Japan, 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 affects the overall efficiency of photovoltaic (PV) systems. Summer stands out as the most productive season, with an impressive daily output of 5.20 kWh per kW of installed solar capacity. Spring follows closely behind, generating 5.01 kWh/day. These seasons offer ideal conditions for solar energy production, with longer daylight hours and more direct sunlight. However, the picture changes dramatically during the colder months. Autumn sees a considerable drop in output to 3.22 kWh/day, while winter performance plummets to just 2.30 kWh/day. This stark contrast highlights the challenges of maintaining consistent energy production throughout the year in Iwaizumi's climate.

Optimizing Solar Panel Installation

To maximize year-round solar energy production in Iwaizumi, Iwate, fixed solar panels should be installed at a tilt angle of 35 degrees facing south. This optimal angle has been calculated to capture the most sunlight across all seasons, taking into account the Earth's elliptical orbit and the location's specific latitude.

Environmental and Weather Considerations

Several factors could potentially impede solar production in Iwaizumi: 1. Heavy snowfall: The region experiences significant snowfall in winter, which can cover solar panels and reduce their efficiency. 2. Cloudy weather: Iwaizumi's coastal location may lead to frequent cloud cover, particularly during certain seasons. 3. Typhoons: The area is susceptible to typhoons, which can damage solar installations if not properly secured. To mitigate these challenges, several preventative measures can be taken:

• Install panels at a steeper angle to encourage snow sliding off
• Use snow-shedding coatings on panels
• Implement a robust cleaning and maintenance schedule
• Choose high-quality, weather-resistant panels and mounting systems
• Consider adding a battery storage system to balance out seasonal variations in production

While Iwaizumi's location presents some challenges for year-round solar energy production, proper installation techniques and preventative measures can help maximize the potential of solar PV systems in this area.

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 Iwaizumi

Seasonal solar PV output for Latitude: 39.8524, Longitude: 141.7977 (Iwaizumi, 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 35° South in Iwaizumi, Japan

To maximize your solar PV system's energy output in Iwaizumi, Japan (Lat/Long 39.8524, 141.7977) throughout the year, you should tilt your panels at an angle of 35° 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 Iwaizumi, 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 Iwaizumi, Japan. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 35° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
23° South in Summer	44° South in Autumn	54° South in Winter	33° 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 Iwaizumi, 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 Iwaizumi, 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 Iwaizumi, Japan

The topography around Iwaizumi, Japan, is characterized by a rugged and mountainous landscape typical of the Sanriku Coast region. Located in Iwate Prefecture, Iwaizumi is nestled within the northern reaches of the Kitakami Mountains, which dominate the area with their steep slopes and deep valleys. The terrain is largely forested, with dense stands of trees covering much of the mountainsides. Rivers and streams carve through the landscape, creating narrow valleys and gorges. The Akka River, one of the major waterways in the area, flows through Iwaizumi, contributing to the region's scenic beauty. The coastline to the east of Iwaizumi features dramatic cliffs and rocky shores, formed by the mountains meeting the Pacific Ocean. This mountainous terrain presents challenges for large-scale solar PV installations in the immediate vicinity of Iwaizumi. The steep slopes and limited flat areas make it difficult to find suitable locations for extensive solar farms. Additionally, the dense forest cover would require significant clearing, which could have environmental implications.

Potential Areas for Large-Scale Solar PV

While the immediate surroundings of Iwaizumi may not be ideal for large-scale solar PV, there are areas in the broader region that could be more suitable: Coastal Plains: To the south and southeast of Iwaizumi, where the mountains give way to more expansive coastal plains, there may be potential for solar installations. These areas offer flatter terrain and potentially more open spaces. River Valleys: The wider sections of river valleys, particularly those of the Akka River and its tributaries, might provide some suitable locations. These areas tend to have gentler slopes and more open land. Abandoned Agricultural Land: As with many rural areas in Japan, there may be abandoned or underutilized agricultural land in the broader region. These areas could potentially be repurposed for solar energy production. Reclaimed Land: Any reclaimed land along the coast, if available, could be considered for solar installations, as it tends to be flat and free from obstructions. It's important to note that while these areas may be more suitable from a topographical standpoint, other factors such as grid connectivity, local regulations, and environmental considerations would need to be thoroughly assessed before implementing any large-scale solar PV projects in the region.

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.

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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.