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Wind Effects on Floating Solar Systems: Why Aerodynamic Design Matters

Introduction

Floating photovoltaic (FPV) technology is rapidly expanding beyond lakes and reservoirs into more challenging environments such as ports, industrial basins, and nearshore areas. While these new applications unlock significant opportunities for renewable energy generation, they also introduce new engineering challenges - especially wind loading.

To better understand these challenges, HelioRec collaborated with leading academic and research institutions:

Together, we investigated how wind affects realistic floating solar systems under different configurations and environmental conditions.


Floating solar wind testing

Figure 1. HelioRec's floating system is tested at CSTB, France


Why Wind Matters for Floating Solar

Unlike conventional rooftop solar or ground-mounted photovoltaic systems, floating solar systems operate on moving surfaces exposed to continuously changing environmental conditions.

Wind creates not only horizontal forces but also:

  • Uplift forces affecting platform stability

  • Multi-directional loading conditions

  • Aerodynamic interactions between neighboring modules

  • Dynamic behavior amplified by water movement

These effects become increasingly important when moving from protected inland reservoirs toward ports and nearshore applications.


Moving Beyond Simplified Models

Most previous research investigating wind loading on photovoltaic systems focused primarily on:

  • Rooftop solar installations

  • Ground-mounted solar farms

  • Simplified laboratory models

However, realistic floating solar systems behave differently.

The objective of this research was to establish an experimental benchmark for understanding wind-induced loads acting on realistic modular floating photovoltaic systems developed by HelioRec.


How Testing Was Performed

Testing was performed at CSTB’s aerodynamic wind tunnel using a testing section measuring: 6 m width, 5 m height, 12 m length.

The investigated floating photovoltaic unit consisted of:

  • Solar panel dimensions: 2,382 mm × 1,134 mm

  • Panel inclination: 10° tilt

  • Total system weight: approximately 52 kg


Both full-scale (1:1) and reduced-scale configurations were tested.

The study investigated multiple configurations:

  • Individual Components (Floater only, Floater with support structures, Complete floating solar unit);

  • Multi-Unit Configurations (Two-panel arrangements, Fourteen-unit floating solar arrays, Multiple panel positions inside larger installations).


Testing was performed under three wind speeds:

  • 15 m/s (54 km/h)

  • 35 m/s (126 km/h)

  • 55 m/s (198 km/h)

This means the study investigated aerodynamic behavior under conditions approaching 200 km/h wind speeds, representing severe weather scenarios relevant for challenging deployments.

Wind directions were investigated across the complete: 0° - 360° range allowing researchers to identify critical loading conditions for different orientations.

Figure 2. HelioRec's floating system is tested at CSTB, wind speed 55 m/s


Key Findings


1. Photovoltaic Panels Generate Most Wind Loads

The study demonstrated that photovoltaic panels themselves generate the majority of aerodynamic loading. The floating structure contributes to the overall response, but adding solar panels significantly increases aerodynamic forces.

This means that optimizing panel arrangement is critical for floating solar engineering.


2. Wind Direction Strongly Influences Loading

The research demonstrated that aerodynamic behavior changes significantly depending on wind direction.

The most critical loading conditions were observed primarily between:

135°-225° wind directions

Within this range:

  • Higher uplift forces appeared

  • Stronger aerodynamic interactions occurred

  • Greater variability between modules was observed

This demonstrates why floating solar projects cannot rely solely on simplified design assumptions.


3. Floating Solar Arrays Behave Differently Than Individual Modules

One important discovery was that floating photovoltaic modules cannot be analyzed individually.

Neighboring modules significantly influence aerodynamic behavior.

Testing demonstrated:

  • Upstream modules can shield downstream modules

  • Edge modules may experience larger loads

  • Critical module locations shift depending on wind direction

In certain configurations:

Some panel positions experienced approximately 27% higher lift forces compared with isolated units

This finding demonstrates that isolated module testing alone may underestimate real loading conditions.


4. Array Effects Cannot Be Ignored

Large floating solar farms behave as integrated aerodynamic systems rather than collections of independent modules.

The study investigated arrays containing:

  • Up to 14 interconnected floating units

  • Multiple rows of modules

  • Various panel positions inside grouped configurations

Results showed that aerodynamic loading inside floating solar farms is highly non-uniform.

Different panel locations govern design requirements under different wind directions.


Why This Matters for Floating Solar Projects

Understanding aerodynamic behavior directly affects:

  • Structural design

  • Mooring systems

  • Anchoring systems

  • Installation costs

  • Long-term reliability

  • Insurance and certification processes

As floating solar projects become larger and move into more demanding environments, accurate aerodynamic understanding becomes increasingly important.

This is particularly relevant for:

  • Floating solar in ports

  • Nearshore floating solar projects

  • Industrial water basins

  • Coastal infrastructure


Conclusion

This research demonstrates that realistic floating photovoltaic systems require dedicated aerodynamic analysis rather than relying solely on assumptions borrowed from rooftop or ground-mounted solar systems.

The results show that:

  • Wind loading strongly depends on configuration

  • Aerodynamic interactions cannot be ignored

  • Array effects significantly influence loading

  • Full-scale testing provides valuable validation

  • Large floating solar systems require dedicated engineering approaches

As floating solar moves toward larger projects and more challenging environments, understanding wind effects becomes essential for building reliable, bankable, and long-lasting infrastructure.

At HelioRec, these findings directly contribute to developing floating solar systems designed for real operational conditions.

Interested in learning more about floating solar engineering, wind analysis, or nearshore floating solar projects?


HelioRec designs, manufactures, and deploys floating solar systems for both inland and marine nearshore environments. To discuss whether floating solar is suited to your site, contact us

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