Solar Energy Potential in Rio de Mouro, Portugal
Rio de Mouro, a location in Portugal situated at 38.7674° N latitude and -9.3301° E longitude, offers promising potential for solar energy generation throughout the year. This Northern Temperate Zone location experiences varying levels of solar productivity across different seasons. Summer stands out as the most productive period, with an impressive daily output of 7.69 kWh per kW of installed solar capacity. Spring follows closely, generating 6.38 kWh per day. These seasons present ideal conditions for maximizing solar energy production, thanks to longer daylight hours and more direct sunlight. Autumn sees a moderate decrease in productivity, with 4.46 kWh generated daily per kW installed. Winter, as expected, shows the lowest output at 2.60 kWh per day. Despite this seasonal dip, Rio de Mouro still maintains a respectable year-round solar energy potential.Optimal Panel Installation
For those considering a fixed panel installation in Rio de Mouro, the ideal tilt angle to maximize year-round solar production is 33 degrees facing South. This angle has been calculated to optimize energy capture across all seasons, taking into account the Earth's elliptical orbit and the location's specific solar elevation angles.Environmental Considerations
While Rio de Mouro generally offers favorable conditions for solar energy production, there are a few environmental factors to consider: 1. Coastal proximity: The area's proximity to the Atlantic Ocean may lead to increased humidity and occasional fog, potentially reducing solar efficiency. 2. Dust and pollen: The region's vegetation and occasional Saharan dust events could lead to panel soiling. To mitigate these factors, consider implementing regular cleaning schedules for the panels and using anti-soiling coatings. Additionally, installing panels at a slightly steeper angle than the optimal 33 degrees can help with natural cleaning during rainfall. Overall, Rio de Mouro presents a highly suitable location for solar PV installations, with ample opportunity for energy generation throughout the year, particularly during the 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 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 Rio De Mouro
Seasonal solar PV output for Latitude: 38.7674, Longitude: -9.3301 (Rio De Mouro, 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 33° South in Rio De Mouro, Portugal
To maximize your solar PV system's energy output in Rio De Mouro, Portugal (Lat/Long 38.7674, -9.3301) 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 Rio De Mouro, 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 Rio De Mouro, Portugal. 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 |
|---|---|---|---|
| 23° South in Summer | 43° South in Autumn | 54° South in Winter | 31° 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 Rio De Mouro, 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 Rio De Mouro, 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 Rio De Mouro, Portugal
Rio de Mouro is a parish located in the municipality of Sintra, Portugal, situated northwest of Lisbon. The topography of the area surrounding Rio de Mouro is characterized by gently rolling hills and shallow valleys, typical of the coastal regions of central Portugal. The landscape gradually rises from the coastal plains towards the inland areas, with elevations ranging from about 100 to 300 meters above sea level. To the north and northwest of Rio de Mouro, the terrain becomes more rugged as it approaches the Sintra Mountains. This small mountain range, known for its lush forests and romantic palaces, creates a natural barrier that influences the local climate and topography. The southern slopes of these mountains gently descend towards Rio de Mouro, creating a series of hills and valleys. To the east and southeast, the land is generally flatter, with subtle undulations as it extends towards Lisbon and the Tagus River estuary. This area is more urbanized, with a mix of residential developments and some remaining agricultural lands.
Suitability for Large-scale Solar PV
When considering areas nearby that would be most suited to large-scale solar PV installations, several factors come into play. The ideal locations would have ample sunlight exposure, relatively flat terrain, and minimal shading from natural or man-made structures. The areas to the east and southeast of Rio de Mouro show the most promise for large-scale solar PV projects. These regions benefit from flatter terrain, which simplifies construction and reduces costs associated with land preparation. The more open landscape also means less natural shading from hills or forests. Some of the agricultural lands that still exist in this direction could potentially be repurposed for solar farms, provided there are no conflicts with local land use regulations or food production needs. These areas often have the advantage of existing road access, which is beneficial for construction and maintenance of solar installations. It's important to note that while the flatter areas to the east are generally more suitable, any specific site would require detailed assessment. Factors such as local zoning laws, proximity to electrical infrastructure, and environmental considerations would all need to be carefully evaluated before determining the feasibility of a large-scale solar PV project. The hillier regions to the north and west, while potentially offering good sun exposure on south-facing slopes, would likely present more challenges in terms of construction and may not be as cost-effective for large-scale installations. However, these areas might be suitable for smaller, distributed solar projects if properly sited. In conclusion, while the entire region around Rio de Mouro benefits from Portugal's abundant sunshine, the flatter, more open areas to the east and southeast appear to offer the most promising conditions for large-scale solar PV development, subject to further detailed site-specific assessments.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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Author: Aaron Robinson
Publisher: profileSOLAR.com
First Published: Friday 7th of March 2025
Last Updated: Monday 21st of July 2025
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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.




