Dreux, France, located at latitude 48.7291 and longitude 1.3589 in the Northern Temperate Zone, experiences significant seasonal variations that affect its solar energy production potential throughout the year.

Seasonal Solar Production

Solar PV systems in Dreux demonstrate marked differences in energy output across seasons. Summer proves most productive with 5.52kWh per day for each kilowatt installed, followed closely by spring generating 5.03kWh/day. Production drops considerably in autumn to 2.85kWh/day, while winter sees the lowest output at just 1.27kWh/day per kilowatt of installed capacity.

This pattern indicates that Dreux is moderately suitable for solar energy production, with approximately six months of good generation potential from March through August. The substantial drop in winter months (approximately 77% less production than summer) means annual production will be somewhat uneven.

Optimal Panel Installation

For fixed solar panel installations in Dreux, the ideal tilt angle is 42 degrees facing south. This specific angle maximizes year-round energy production by optimizing the capture of available sunlight throughout the changing seasons, accounting for the Earth's elliptical orbit and Dreux's northern hemisphere position.

Environmental Considerations

Several environmental factors could impact solar production in Dreux:

• Cloud cover and precipitation: The region experiences frequent cloud cover, particularly in winter months, contributing to the low winter production figures. Dreux averages 114 rainy days per year, which can temporarily reduce solar efficiency.
• Snow and frost: Winter accumulation can block panels, while morning frost can delay daily production start times during colder months.

To mitigate these challenges, installations should incorporate self-cleaning panel technologies, slightly steeper tilt angles than the mathematical optimum (perhaps 45-50 degrees) to facilitate snow sliding, and regular maintenance schedules focused on the autumn-to-winter transition period. Additionally, high-efficiency panels rated for low-light conditions would be beneficial given the significant periods of reduced sunlight.

While not ideal year-round, Dreux still offers sufficient solar potential to make PV installations worthwhile, especially if sized appropriately to account for the winter production deficit or paired with complementary energy sources.

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 Dreux

Seasonal solar PV output for Latitude: 48.7291, Longitude: 1.3589 (Dreux, 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 Dreux, France

To maximize your solar PV system's energy output in Dreux, France (Lat/Long 48.7291, 1.3589) 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 Dreux, 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 Dreux, 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
32° South in Summer	52° South in Autumn	62° South in Winter	41° 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 Dreux, 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 Dreux, 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 Dreux, France

Dreux, a commune located in northern France, sits in a region characterized by gentle hills, shallow valleys, and undulating plains. The town itself is nestled in the valley of the Blaise River, a tributary of the Eure River, at an elevation of approximately 120 meters above sea level. This area is part of the larger Paris Basin, a geological depression filled with sedimentary rocks that creates a relatively flat to gently rolling landscape. The immediate surroundings of Dreux feature modest elevation changes, with the terrain gradually rising to form low hills to the north and east, while the southern and western approaches are marked by more open, flat agricultural plains. The Blaise valley creates a natural corridor through the landscape, with slightly steeper slopes along its banks. The overall relief in the region rarely exceeds 50-100 meters between valley floors and hilltops, making for a subtle rather than dramatic topography.

Landscape Features and Land Use

The landscape around Dreux is predominantly agricultural, with extensive fields devoted to cereal crops, particularly wheat and barley. Interspersed among these agricultural areas are patches of woodland, especially on steeper slopes or less fertile ground. The Drouais region, as this area is known, represents a transition zone between the Île-de-France to the east and the more wooded Normandy region to the west. Small streams and drainage channels crisscross the landscape, feeding into the Blaise and Eure rivers. The river valleys tend to be the most topographically distinct features, cutting shallow but noticeable depressions through the otherwise gentle terrain. These valleys often contain the region's settlements and transportation routes.

Solar PV Potential in the Region

For large-scale solar photovoltaic (PV) development, several areas around Dreux show particular promise. The most suitable locations would be the flat or gently sloping agricultural plains to the south and southwest of Dreux. These areas combine several advantageous characteristics: First, they feature relatively level terrain with minimal shading from topographic features, maximizing potential solar exposure throughout the day. The open agricultural character of these lands means fewer trees or structures that might cast shadows on solar arrays. Second, these southern plains have good solar radiation levels for northern France. While this is less than southern France, it remains economically viable for large-scale installations. Third, the land in these areas is predominantly used for agriculture, with large, contiguous parcels that could accommodate substantial solar developments. The relatively low population density in these rural areas also minimizes potential land use conflicts. The plains between Dreux and Chartres (to the south) represent particularly promising territory, as do the open areas southwest toward Vernouillet and Châteauneuf-en-Thymerais. These locations combine favorable topography with good access to existing electrical infrastructure, as they are near population centers but not immediately adjacent to densely built areas. Areas less suitable for solar development include the more undulating terrain to the north and northeast of Dreux, where the increased slopes and varied aspects would complicate installation and potentially reduce efficiency. Similarly, the river valleys themselves, while flat, often represent areas of ecological importance and may face greater regulatory restrictions.

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.