Viimsi, Harjumaa, Estonia, located at 59.5043°N, 24.854°E, presents a challenging environment for year-round solar energy generation. This Northern Temperate Zone location experiences significant seasonal variations in solar output, which greatly impact the effectiveness of photovoltaic (PV) systems.

Seasonal Solar Performance

The solar energy production in Viimsi varies dramatically throughout the year. Summer months offer the most favorable conditions, with an average daily output of 5.91 kWh per kW of installed solar capacity. Spring follows as the second-best season, producing 3.89 kWh/day. However, autumn and winter see a sharp decline in solar generation, with outputs of 1.48 kWh/day and a mere 0.47 kWh/day, respectively.

Optimal Panel Placement

To maximize year-round solar production in Viimsi, Harjumaa, fixed solar panels should be installed at a tilt angle of 49 degrees facing south. This angle has been calculated to optimize energy capture across all seasons, taking into account the location's latitude and the Earth's elliptical orbit.

Environmental Factors and Mitigation

Several environmental factors can impede solar production in Viimsi:

1. Long, dark winters: With extremely short days and low sun angles during winter, solar output is severely limited.
2. Snow and ice accumulation: These can cover panels, reducing efficiency.
3. Cloudy weather: Frequent cloud cover, especially in autumn and winter, can significantly reduce solar irradiance.

To mitigate these challenges, consider the following measures:

• Use high-efficiency panels designed for low-light conditions
• Install snow guards or heating elements to prevent snow accumulation
• Implement a robust cleaning and maintenance schedule
• Consider complementary energy sources for winter months

While Viimsi's location is far from ideal for year-round solar energy production, careful system design and maintenance can still make solar PV a viable part of a diversified energy strategy, particularly during the more productive 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 20 locations across Estonia. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.

Link: Solar PV potential in Estonia by location

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

Seasonal solar PV output for Latitude: 59.5043, Longitude: 24.854 (Viimsi, Estonia), 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 49° South in Viimsi, Estonia

To maximize your solar PV system's energy output in Viimsi, Estonia (Lat/Long 59.5043, 24.854) throughout the year, you should tilt your panels at an angle of 49° 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 Viimsi, Estonia

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 Viimsi, Estonia. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 49° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
42° South in Summer	61° South in Autumn	71° South in Winter	51° 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 Viimsi, Estonia

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 Viimsi, Estonia.

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 Viimsi, Estonia

Viimsi, Estonia, located at approximately 59.5043°N latitude and 24.854°E longitude, is situated on a peninsula that juts out into the Gulf of Finland, just northeast of the capital city Tallinn. The topography of this area is characterized by a relatively flat coastal plain with gentle undulations. The Viimsi Peninsula itself is predominantly low-lying, with elevations generally ranging from sea level to about 50 meters above sea level. The coastline is irregular, featuring small bays, coves, and rocky outcrops. Inland, the landscape is a mix of open fields, scattered woodlands, and residential areas. The terrain gradually rises towards the center of the peninsula, forming a modest ridge that runs north-south. To the west of Viimsi, across a narrow strait, lies the island of Aegna, which is similarly low-lying and forested. To the south and southeast, the land transitions into the outskirts of Tallinn, becoming more urbanized but maintaining a generally flat to gently rolling topography.

Potential for Large-Scale Solar PV

When considering areas nearby that might be suitable for large-scale solar photovoltaic (PV) installations, several factors come into play. The relatively flat terrain of the region is generally favorable for solar farms, as it reduces the complexity and cost of installation. The most promising areas for large-scale solar PV would likely be found inland, away from the immediate coastal areas. The central and southern parts of the Viimsi Peninsula, where there are open fields and less dense residential development, could offer potential sites. These areas benefit from the slight elevation gain, which can reduce the risk of coastal flooding and salt spray that might damage solar equipment. Areas to the south and southeast of Viimsi, in the less developed regions between the peninsula and Tallinn, might also be suitable. These locations offer larger tracts of open land that could accommodate substantial solar installations. However, it's important to note that Estonia's high latitude means it receives less direct sunlight than more southern locations, particularly during winter months. This factor, combined with the region's climate, which includes significant cloud cover and precipitation, may impact the overall efficiency and economic viability of large-scale solar projects in the area. Any development of solar PV installations would need to carefully balance land use considerations, including agricultural needs, forest preservation, and residential expansion, with the benefits of renewable energy production. Environmental impact assessments and community consultations would be crucial steps in identifying the most appropriate locations for such projects.

Estonia solar PV Stats as a country

Estonia ranks 58th in the world for cumulative solar PV capacity, with 414 total MW's of solar PV installed. Each year Estonia is generating 311 Watts from solar PV per capita (Estonia ranks 13th in the world for solar PV Watts generated per capita). [source]

Are there incentives for businesses to install solar in Estonia?

Yes, there are incentives for businesses wanting to install solar energy in Estonia. The Estonian government offers a range of financial support and tax incentives for businesses that invest in renewable energy sources such as solar power. These include grants, loans, and tax deductions. Additionally, the government has set up a feed-in tariff system which guarantees a fixed price for electricity generated from renewable sources such as solar power.

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