Arganil, Coimbra, Portugal, situated in the Northern Temperate Zone, offers a promising location for solar PV energy generation throughout the year. This picturesque town, with coordinates 40.2167, -8.0574, experiences varying levels of solar potential across different seasons.

Seasonal Solar Performance

Summer stands out as the peak season for solar energy production in Arganil, Coimbra, with an impressive output of 7.47 kWh per day for each kW of installed solar capacity. Spring follows closely, generating 6.07 kWh/day. Autumn sees a moderate decline to 4.09 kWh/day, while winter experiences the lowest output at 2.35 kWh/day.

The most favorable period for solar energy generation in Arganil spans from late spring through early autumn. During these months, longer daylight hours and higher sun angles contribute to increased solar panel efficiency.

Optimal Panel Installation

For those considering a fixed panel installation in Arganil, Coimbra, the ideal tilt angle to maximize year-round solar production is 35 degrees facing south. This angle has been carefully calculated to account for the Earth's elliptical orbit and the location's specific latitude, ensuring optimal exposure to sunlight throughout the year.

Environmental Considerations

While Arganil generally provides favorable conditions for solar energy production, there are a few environmental factors to consider:

1. Occasional fog and mist, particularly in autumn and winter mornings, may temporarily reduce solar efficiency.
2. Dust and pollen from nearby forests could accumulate on panels, slightly decreasing their performance.

To mitigate these issues, regular panel cleaning and maintenance are recommended. Additionally, installing panels at a slight angle can help with natural cleaning during rainfall. Some installers may also suggest anti-soiling coatings to minimize dust accumulation.

Overall, Arganil presents a viable location for solar PV installations, with strong potential during summer and spring, and manageable output even during the less favorable winter 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 179 locations across Portugal. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.

Link: Solar PV potential in Portugal by location

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

Seasonal solar PV output for Latitude: 40.2167, Longitude: -8.0574 (Arganil, Portugal), 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 Arganil, Portugal

To maximize your solar PV system's energy output in Arganil, Portugal (Lat/Long 40.2167, -8.0574) 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 Arganil, Portugal

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 Arganil, Portugal. 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
24° South in Summer	45° South in Autumn	55° 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 Arganil, Portugal

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 Arganil, Portugal.

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 Arganil, Portugal

The landscape surrounding Arganil, Portugal, is characterized by its diverse and picturesque topography. Situated in the central region of the country, Arganil is nestled within the Serra do Açor mountain range, which is part of the larger Serra da Estrela mountain system. This area is known for its rugged terrain, featuring a mix of steep hills, rolling valleys, and winding rivers. The town of Arganil itself sits at an elevation of approximately 200 meters above sea level. As you move away from the town center, the terrain becomes more varied and dramatic. To the north and east, the land rises steadily, with numerous hills and small mountains dotting the landscape. These elevations can reach heights of up to 1,000 meters in some areas of the Serra do Açor. The southern and western parts of the region are generally less mountainous, with gentler slopes and broader valleys. Here, you'll find a patchwork of agricultural fields, olive groves, and pine forests interspersed with small villages and hamlets. The Alva River, a significant watercourse in the area, winds its way through the landscape, carving out scenic valleys and gorges.

Potential for Large-scale Solar PV

When considering areas suitable for large-scale solar photovoltaic (PV) installations near Arganil, several factors come into play. The ideal locations would combine favorable topography with high solar irradiance and minimal environmental impact. The gently sloping areas to the south and west of Arganil present the most promising opportunities for solar PV development. These regions typically receive more direct sunlight throughout the day and have fewer obstructions from steep terrain. The broader valleys and plateaus in these directions offer larger, flatter areas that could accommodate extensive solar arrays without requiring significant land alterations. Some specific areas that might be well-suited for solar PV projects include the lands between Arganil and the nearby town of Góis to the southwest, as well as the more open terrain stretching towards Tábua to the south. These areas generally have a good balance of available space, suitable slope angles, and access to existing infrastructure. It's important to note that while the mountainous regions to the north and east may have some south-facing slopes that receive ample sunlight, the challenging terrain and potential environmental concerns make these areas less ideal for large-scale solar developments. Additionally, any solar project would need to carefully consider its impact on local ecosystems, agricultural lands, and cultural heritage sites, which are abundant in this historically rich region of Portugal.

Portugal solar PV Stats as a country

Portugal ranks 32nd in the world for cumulative solar PV capacity, with 1,801 total MW's of solar PV installed. This means that 3.40% of Portugal's total energy as a country comes from solar PV (that's 23rd in the world). Each year Portugal is generating 174 Watts from solar PV per capita (Portugal ranks 29th in the world for solar PV Watts generated per capita). [source]

Are there incentives for businesses to install solar in Portugal?

Yes, there are several incentives for businesses wanting to install solar energy in Portugal. The Portuguese government offers a range of financial incentives and tax breaks for businesses that invest in renewable energy sources such as solar power. These include grants, loans, and tax credits. 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. This helps to make investing in solar energy more attractive to businesses.

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