Carnaxide, Lisbon, Portugal offers reasonably good conditions for solar photovoltaic energy generation throughout most of the year, though with significant seasonal variation typical of its Northern Temperate Zone location.

Seasonal Solar Performance

The location shows strong solar energy potential during the warmer months, with summer delivering the highest output at 7.68kWh per day per kW of installed solar capacity. Spring also performs well at 6.38kWh per day per kW, making these two seasons the ideal times for solar generation at this site. Autumn sees a notable drop in production to 4.45kWh per day per kW, while winter months present the most challenging period with only 2.60kWh per day per kW. This winter figure represents about one-third of summer production, highlighting the importance of seasonal planning for solar installations. For optimal year-round performance at Carnaxide, Lisbon, solar panels should be installed at a fixed tilt angle of 33 degrees facing south. This angle maximizes total annual energy production by accounting for the sun's changing position throughout the year and the varying solar irradiance levels at this latitude.

Local Factors Affecting Solar Production

Several environmental and weather factors in the Carnaxide area could potentially impact solar panel performance:

• Atlantic coastal moisture and salt air exposure, which can cause corrosion and reduce panel efficiency over time
• Dust accumulation during dry periods, particularly in summer months when solar production is at its peak
• Potential for marine layer clouds and fog, especially during transition seasons
• Winter precipitation that may temporarily reduce output during the already low-production months

Preventative Installation Measures

To maximize energy production despite these challenges, several installation strategies should be considered. Using marine-grade mounting hardware and corrosion-resistant materials helps combat salt air effects, while ensuring adequate panel spacing allows for proper air circulation and cooling. Installing panels with easy access for cleaning helps maintain peak efficiency during dusty periods. A slight increase in tilt angle beyond the calculated optimum can also help panels self-clean through rainfall runoff, though this should be balanced against the optimal 33-degree recommendation. Regular maintenance scheduling becomes particularly important during the high-production summer months when dust accumulation could significantly impact the strong solar output potential. Professional cleaning and inspection services can help ensure the installation continues performing at its rated capacity throughout the year.

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 Carnaxide

Seasonal solar PV output for Latitude: 38.7297, Longitude: -9.2507 (Carnaxide, 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 Carnaxide, Portugal

To maximize your solar PV system's energy output in Carnaxide, Portugal (Lat/Long 38.7297, -9.2507) 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 Carnaxide, 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 Carnaxide, 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 Carnaxide, 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 Carnaxide, 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 Carnaxide, Portugal

Topographical Features of Carnaxide

Carnaxide sits in the coastal lowlands of central Portugal, positioned within the broader Lisbon metropolitan area approximately ten kilometers west of the capital city. The terrain around this municipality is characterized by gently rolling hills and relatively modest elevation changes, typical of the Portuguese coastal plain that extends inland from the Atlantic Ocean. The landscape features a series of low ridges and shallow valleys that create a undulating topography rather than dramatic elevation changes. Most of the area sits between 50 and 150 meters above sea level, with the highest points reaching around 200 meters in the surrounding region. The Tagus River lies to the south, having carved out a broad valley that influences the local drainage patterns and creates some of the flattest terrain in the vicinity.

Climate and Weather Patterns

The region benefits from a Mediterranean climate with Atlantic influences, characterized by mild, wet winters and warm, dry summers. The coastal proximity moderates temperature extremes while the prevailing westerly winds from the Atlantic help maintain relatively stable weather conditions. Cloud cover tends to be lighter during the summer months, while winter brings more frequent overcast skies and precipitation. The area experiences minimal extreme weather events, with occasional Atlantic storms during winter months being the primary concern for solar installations. The stable climate conditions and predictable seasonal patterns make this region well-suited for renewable energy projects.

Optimal Areas for Large-Scale Solar Development

The most promising locations for extensive solar photovoltaic installations lie in the flatter agricultural areas southeast of Carnaxide, particularly in the broader valleys that extend toward the Tagus River. These areas offer several advantages including relatively level terrain that minimizes grading costs, good accessibility for construction and maintenance vehicles, and sufficient space for large arrays without significant topographical constraints. The elevated plateaus to the north and northeast of Carnaxide also present excellent opportunities for solar development. While these areas require more careful site planning due to their gently sloping nature, they often provide better drainage and can offer slight advantages in terms of air circulation around solar panels. The consistent south-facing slopes in this region are particularly well-positioned for optimal solar exposure throughout the day. Agricultural lands in the surrounding municipalities, particularly those currently used for less intensive farming operations, represent prime candidates for solar development. These areas typically have existing road access, electrical infrastructure nearby, and terrain that has already been cleared and leveled for agricultural use.

Infrastructure and Access Considerations

The proximity to Lisbon provides significant advantages for large-scale solar projects, including access to major electrical transmission infrastructure and transportation networks. The A5 motorway and several regional roads provide excellent access for construction equipment and ongoing maintenance operations. The existing electrical grid infrastructure in the Lisbon metropolitan area is well-developed and capable of handling substantial renewable energy inputs. This reduces the need for extensive new transmission line construction that might be required in more remote locations. Local topographical features generally support good drainage, which is essential for the longevity of solar installations. The gentle slopes help prevent water accumulation while the stable soil conditions in most areas provide solid foundations for mounting systems.

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.