Longwy, Grand Est, France presents a moderately challenging location for year-round solar energy generation, with significant seasonal variations typical of its Northern Temperate Zone position.

Seasonal Solar Performance

The solar energy output at Longwy varies dramatically throughout the year. Summer months deliver the strongest performance at 5.23kWh per day per kW of installed capacity, making this the prime season for solar generation. Spring follows as the second-best period with 4.71kWh daily output per kW, offering nearly comparable energy production. Autumn sees a notable decline to 2.61kWh per day per kW, while winter presents the most challenging conditions with only 1.21kWh daily per kW. This represents more than a four-fold difference between peak summer and winter production levels. For optimal year-round energy capture at this location, solar panels should be installed at a fixed tilt angle of 42 degrees facing south. This angle maximizes total annual production by accounting for the sun's varying position throughout the seasons.

Local Factors Affecting Solar Production

Several environmental and weather factors can significantly impact solar energy generation in Longwy:

• Frequent cloud cover and overcast skies, particularly during autumn and winter months
• Snow accumulation on panels during winter, which can block sunlight entirely
• High humidity and fog, especially in valleys, reducing solar irradiance
• Dust and debris accumulation from agricultural activities in surrounding areas

Preventative Measures for Better Performance

To maximize solar energy production despite these challenges, several installation strategies prove effective. Installing panels at steeper angles helps snow slide off more easily, while ensuring adequate spacing between panel rows prevents snow from one panel shading another. Regular cleaning schedules become essential, particularly after dusty periods or before peak production seasons. Anti-reflective coatings can help panels capture more diffuse light during cloudy conditions. Proper drainage around installation sites prevents water pooling that could create localized humidity issues. Additionally, choosing high-quality panels with better low-light performance helps maintain decent output during overcast periods that are common in this region. While Longwy's location presents seasonal challenges for solar generation, proper installation techniques and maintenance can help optimize energy production 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 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 Longwy

Seasonal solar PV output for Latitude: 49.5215, Longitude: 5.7638 (Longwy, 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 42° South in Longwy, France

To maximize your solar PV system's energy output in Longwy, France (Lat/Long 49.5215, 5.7638) throughout the year, you should tilt your panels at an angle of 42° 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 Longwy, 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 Longwy, France. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 42° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
33° South in Summer	52° South in Autumn	63° South in Winter	42° 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 Longwy, 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 Longwy, 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 Longwy, France

Topographical Features of the Longwy Region

The area surrounding Longwy, France is characterized by gently rolling hills and plateaus that form part of the broader Lorraine region's landscape. This northeastern corner of France sits within the Ardennes foothills, where the terrain consists of modest elevations that rarely exceed 400 meters above sea level. The landscape features a series of undulating ridges and shallow valleys that have been shaped by centuries of geological processes and human activity. The immediate vicinity of Longwy displays a mixed topography of agricultural plateaus interspersed with forested areas and former industrial sites. The Chiers River valley cuts through the region, creating some of the area's most pronounced topographical variation. To the north and east, the land gradually rises toward the Belgian border, while southward the terrain opens into the broader Lorraine plateau. Much of the surrounding countryside consists of open farmland with gentle slopes that rarely exceed 10-15 degrees of inclination. These agricultural areas are punctuated by small woodlands and the occasional industrial facility or former mining site. The region's industrial heritage has left some areas with relatively flat, cleared land that was previously used for steel production and related activities.

Optimal Areas for Large-Scale Solar Development

The most suitable locations for large-scale solar photovoltaic installations around Longwy would be the extensive agricultural plateaus that stretch southward and westward from the town. These areas offer several advantages including gentle slopes that face predominantly south or southwest, minimal shading from trees or structures, and existing road access for construction and maintenance activities. The former industrial sites scattered throughout the region present particularly attractive opportunities for solar development. Many of these brownfield locations have already been cleared and leveled, reducing preparation costs while avoiding the conversion of productive agricultural land. The industrial heritage of the area also means that electrical grid connections are often already established in these locations. Areas along the broader valley floors, particularly those following the Chiers River system, could accommodate large installations while taking advantage of the relatively flat terrain. However, developers would need to consider flood risk and ensure adequate drainage in these lower-lying areas. The agricultural plateaus extending toward the southwest offer perhaps the greatest potential for utility-scale solar farms. These areas benefit from minimal topographical obstacles, good accessibility via existing farm roads, and terrain that naturally faces favorable directions for solar collection. The gentle undulations in this landscape can actually be advantageous, as they provide natural drainage while maintaining optimal panel positioning. Forested areas and steeper slopes near the Belgian border would be less suitable for large installations due to shading concerns, challenging terrain, and potential environmental restrictions. Similarly, the more densely populated areas immediately surrounding Longwy would face space constraints and potential planning restrictions that could complicate large-scale development.

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!

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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.