Penmarch, France presents a mixed picture for year-round solar energy generation, with significant seasonal variations typical of its Northern Temperate Zone location at latitude 47.8198, longitude -4.3366.

Seasonal Solar Performance

The solar energy output at Penmarch varies dramatically throughout the year. Summer provides the strongest performance at 6.21 kWh per day per kW of installed capacity, making it an excellent time for solar generation. Spring follows as the second-best season with 5.45 kWh per day per kW, offering nearly as much energy production as summer. Autumn sees a notable drop to 3.01 kWh per day per kW, while winter presents the most challenging conditions with only 1.36 kWh per day per kW. This represents less than a quarter of summer's output, highlighting the location's strong seasonal dependency. For fixed panel installations at this location, the ideal tilt angle is 41 degrees facing south to maximize total year-round energy production.

Local Factors Affecting Solar Production

Penmarch's coastal location in Brittany presents several environmental challenges that can significantly impact solar panel performance: Salt Air and Marine Corrosion: Being situated on the Atlantic coast, solar installations face constant exposure to salt-laden air, which can corrode metal components and degrade electrical connections over time. High Humidity and Fog: The maritime climate brings frequent fog and high humidity levels that can reduce solar irradiance and create moisture-related issues with electrical systems. Strong Coastal Winds: The exposed coastal position subjects solar installations to powerful Atlantic winds, particularly during winter storms, which can damage panels and mounting systems. Frequent Cloud Cover: Brittany's oceanic climate is characterized by variable weather patterns with significant cloud cover, especially during autumn and winter months, which directly reduces solar energy production.

Preventative Measures for Installation

To maximize energy production despite these challenges, several protective measures should be implemented:

• Use marine-grade aluminum frames and stainless steel mounting hardware specifically designed to resist salt corrosion
• Apply anti-corrosive coatings to all metal components and ensure proper grounding systems
• Install panels with enhanced wind load ratings and robust mounting systems designed for coastal conditions
• Implement regular cleaning schedules to remove salt deposits that can reduce panel efficiency
• Use sealed electrical enclosures with appropriate IP ratings to prevent moisture ingress

Regular maintenance becomes particularly important in this coastal environment, with more frequent inspections recommended to identify and address corrosion or weather damage before it significantly impacts energy production.

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 627 locations across France. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.

Link: Solar PV potential in France by location

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

Seasonal solar PV output for Latitude: 47.8198, Longitude: -4.3366 (Penmarch, France), 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 41° South in Penmarch, France

To maximize your solar PV system's energy output in Penmarch, France (Lat/Long 47.8198, -4.3366) throughout the year, you should tilt your panels at an angle of 41° 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 Penmarch, France

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 Penmarch, France. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 41° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
32° South in Summer	51° South in Autumn	62° South in Winter	40° 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 Penmarch, France

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 Penmarch, France.

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 Penmarch, France

Topographical Features of Penmarch

Penmarch sits at the southwestern tip of Brittany, France, occupying a distinctive granite peninsula that juts boldly into the Atlantic Ocean. This coastal commune is characterized by remarkably flat terrain, with elevations rarely exceeding 20 meters above sea level. The landscape consists primarily of low-lying plains and gentle undulations carved from ancient granite bedrock, creating an expansive and relatively uniform topographical profile. The immediate coastline features dramatic granite cliffs interspersed with sandy beaches and rocky outcrops. These coastal formations have been sculpted by centuries of Atlantic storms and tidal action, resulting in a rugged shoreline that contrasts sharply with the smooth interior plains. The peninsula's western and southern edges face directly into the prevailing Atlantic weather systems, while the northern areas enjoy slightly more shelter from the most severe coastal conditions. Inland from the coast, the terrain transitions into agricultural fields and moorland, with scattered granite outcroppings breaking through the surface. The soil composition varies from sandy coastal deposits to clay-rich agricultural land, though the underlying granite foundation remains consistent throughout the region. Small valleys and depressions dot the landscape, typically following ancient drainage patterns that flow toward the sea.

Optimal Areas for Large-Scale Solar Development

The flat agricultural plains extending northeast and east of Penmarch present the most promising opportunities for large-scale solar photovoltaic installations. These areas benefit from minimal topographical constraints while maintaining sufficient distance from the harsh coastal environment that could impact equipment longevity. The gentle slopes in these inland regions provide natural drainage advantages without requiring significant grading or earthwork. The commune of Plomeur, located approximately 5 kilometers northeast of Penmarch, offers particularly suitable conditions with its extensive flat farmland and reduced exposure to salt-laden coastal winds. This area combines the region's characteristic low elevation with more stable soil conditions and easier access to electrical infrastructure. Moving further inland toward Pont-l'Abbé, roughly 8 kilometers to the east, the topography becomes even more favorable for solar development. The terrain here features broader expanses of level ground with minimal granite outcroppings, reducing foundation complications and allowing for more efficient panel array layouts. The slightly elevated position of these inland areas also provides better drainage characteristics during Brittany's frequent rainfall periods. The agricultural zones between Penmarch and Quimper, extending northeast along the coastal plain, represent another promising corridor for solar development. These areas maintain the region's flat profile while benefiting from existing rural electrical infrastructure and transportation networks. The transition from coastal granite to inland sedimentary deposits in this direction creates more uniform soil conditions suitable for large-scale construction projects. Areas immediately adjacent to the coast should generally be avoided for solar installations due to the corrosive effects of salt spray and the increased risk of storm damage from Atlantic weather systems. The granite headlands and clifftop areas, while offering unobstructed exposure, present significant challenges in terms of foundation installation and equipment protection from extreme weather conditions.

France solar PV Stats as a country

France ranks 11th in the world for cumulative solar PV capacity, with 14,718 total MW's of solar PV installed. This means that 2.80% of France's total energy as a country comes from solar PV (that's 30th in the world). Each year France is generating 218 Watts from solar PV per capita (France ranks 23rd in the world for solar PV Watts generated per capita). [source]

Are there incentives for businesses to install solar in France?

Yes, there are several incentives for businesses wanting to install solar energy in France. The French government offers a range of financial incentives and tax credits to encourage businesses to invest in renewable energy sources such as solar power. These include the Feed-in Tariff (FiT), which pays businesses for the electricity they generate from their solar panels, and the Investment Tax Credit (ITC), which provides a 30% tax credit on investments made in renewable energy systems. Additionally, businesses may be eligible for grants or loans from local authorities or regional development agencies.

Do you have more up to date information than this on incentives towards solar PV projects in France? Please reach out to us and help us keep this information current. Thanks!

Citation Guide

Article Details for Citation

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.