Solar PV Analysis of Tondela, Portugal
Tondela, Viseu, Portugal, situated at 40.5119°N latitude and -8.0828°E longitude, offers a varied potential for solar energy generation throughout the year. This location in the Northern Temperate Zone experiences significant seasonal fluctuations in solar output, which impacts the efficiency of photovoltaic (PV) systems.
Seasonal Solar Performance
Summer stands out as the most productive season for solar energy in Tondela, Viseu, with an impressive daily output of 7.47 kWh per kW of installed solar capacity. Spring follows closely, generating 6.07 kWh/day. Autumn sees a notable decrease to 4.09 kWh/day, while winter experiences the lowest output at 2.35 kWh/day.
These figures indicate that solar energy production in Tondela is most effective from late spring through early autumn. During this period, longer days and higher sun angles contribute to increased solar irradiance, maximizing PV system performance.
Optimal Panel Installation
For year-round optimization of solar energy production in Tondela, Viseu, fixed solar panels should be installed at a tilt angle of 35 degrees facing south. This angle is calculated to capture the maximum amount of sunlight throughout the year, considering the location's latitude and seasonal sun path variations.
Environmental Considerations
While Tondela's climate is generally favorable for solar energy production, there are some factors to consider:
- Fog and coastal clouds: Being relatively close to the Atlantic coast, Tondela may experience occasional fog or coastal clouds, particularly in the mornings. This can temporarily reduce solar efficiency.
- Dust and pollen: The region's agricultural activities may lead to increased dust and pollen in the air, which can accumulate on solar panels and reduce their effectiveness.
Preventative Measures
To mitigate these potential issues and ensure optimal solar energy production, consider the following measures:
1. Regular cleaning: Implement a routine cleaning schedule for solar panels to remove dust, pollen, and other debris.
2. Anti-soiling coatings: Apply specialized coatings to the panels to minimize dirt accumulation and make cleaning easier.
3. Monitoring systems: Install advanced monitoring systems to track performance and quickly identify any drops in efficiency due to environmental factors.
By implementing these strategies, solar installations in Tondela can maximize their energy production potential throughout the year, taking full advantage of the location's generally favorable solar conditions.
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 Tondela
Seasonal solar PV output for Latitude: 40.5119, Longitude: -8.0828 (Tondela, 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 Tondela, Portugal
To maximize your solar PV system's energy output in Tondela, Portugal (Lat/Long 40.5119, -8.0828) 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 Tondela, 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 Tondela, 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 |
|---|---|---|---|
| 25° South in Summer | 45° South in Autumn | 56° 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 Tondela, 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 Tondela, Portugal.
Our calculation method
- Solar Position:
We determine the Sun's position on the Winter solstice using the location's latitude and solar declination. - Shadow Projection:
We calculate the shadow length cast by panels using trigonometry, considering panel tilt and the Sun's elevation angle. - 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 Tondela, Portugal
The area around Tondela, Portugal, is characterized by a varied topography that reflects the region's position between the coastal plains and the interior mountains. Tondela itself is situated in a transitional zone, with the landscape gradually changing as you move from west to east.
To the west of Tondela, the terrain is relatively flat to gently rolling, with low hills and broad valleys. This area is part of the Beira Litoral region, which extends towards the Atlantic coast. The land here is generally lower in elevation and more suitable for agriculture.
As you move eastward from Tondela, the landscape becomes more rugged and mountainous. The town sits at the foothills of the Serra do Caramulo mountain range, which rises to the east and northeast. These mountains, while not extremely high, create a more dramatic topography with steeper slopes, deeper valleys, and forested areas.
The Dão River and its tributaries flow through the region, carving valleys and creating a network of waterways that influence the local topography. These river valleys often provide areas of flatter land amidst the more hilly surroundings.
Areas Suitable for Large-Scale Solar PV
For large-scale solar photovoltaic (PV) installations, the most suitable areas near Tondela would likely be found to the west and southwest of the town. These areas offer several advantages:
1. Flatter terrain: The more level ground to the west provides easier installation and maintenance of solar panels, reducing construction costs and complexity.
2. Better sun exposure: With fewer tall mountains to cast shadows, these areas generally receive more consistent sunlight throughout the day.
3. Proximity to infrastructure: Being closer to the more developed coastal regions, these areas may have better access to electrical grids and transportation networks, facilitating the distribution of generated power.
4. Less forested land: The western areas typically have less dense forest cover compared to the mountainous regions, reducing the need for extensive land clearing.
However, it's important to note that specific site selection would require detailed surveys considering factors such as exact local topography, land ownership, protected areas, and grid connection possibilities. Additionally, while the mountainous areas to the east may be less suitable for large-scale installations, they could potentially accommodate smaller, distributed solar projects on south-facing slopes.
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!
Citation Guide
Article Details for Citation
Author: Aaron Robinson
Publisher: profileSOLAR.com
First Published: Tuesday 1st of October 2024
Last Updated: Monday 21st of July 2025
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.
