Choosing the right material for solar mounting structures is critical for long-term performance, cost efficiency, and structural reliability. The two most commonly used materials—galvanized steel and aluminium—offer different advantages depending on project scale, environmental conditions, and budget.
This guide compares galvanized steel and aluminium to help buyers, engineers, and project developers select the most suitable solution.
Why Material Selection Matters in Solar Projects
Material choice directly affects structural strength, installation cost, maintenance requirements, and lifespan of the solar system. Solar mounting systems are exposed to harsh environmental conditions, including:
- Rain and humidity
- UV exposure
- Temperature fluctuations
- Wind loads
Choosing the correct material ensures structural integrity and long-term reliability.
What is Galvanized Steel?
Galvanized steel is carbon steel coated with zinc to protect against corrosion. It is widely used in structural applications due to its high strength, durability, and cost efficiency—especially in large-scale solar mounting systems.
Key benefits:
- High strength and load capacity
- Cost-effective for large projects
- Long lifespan with proper coating
- Suitable for harsh environments
The level of zinc coating (e.g., Z140, Z275, Z450) plays a key role in corrosion resistance and lifespan.
Galvanized steel is commonly used in solar structures. Explore our C channel steel solutions for solar mounting systems. We also supply galvanized steel coil for structural and fabrication applications.
What is Aluminium in Solar Structures?
Aluminium is lighter than steel and naturally corrosion-resistant, making it ideal for rooftop solar installations where weight is a key factor.
Key benefits:
- Lightweight and easy to install
- Naturally corrosion-resistant
- Clean and modern appearance
However, aluminium has lower structural strength compared to steel and is generally more expensive.
Galvanized Steel vs Aluminium – Key Differences
| Feature | Galvanized Steel | Aluminium |
|---|---|---|
| Strength | High | Medium |
| Weight | Heavier | Lightweight |
| Cost | Lower | Higher |
| Corrosion Resistance | High (with coating) | Naturally resistant |
| Installation | Moderate | Easy |
Which Material is Better for Solar Mounting?
The best material depends on project size, budget, and structural requirements.
Use galvanized steel when:
Utility-scale solar farms
- Ground-mounted systems
- High wind load areas
- Cost-sensitive projects
Use aluminium when:
Rooftop solar systems
- Lightweight structures
- Corrosion-heavy environments (coastal)
- Fast installation projects
Why Galvanized Steel is Preferred for Large Projects
For industrial and utility-scale solar installations, galvanized steel is often the preferred choice due to its superior structural strength, ability to withstand high loads, and overall cost efficiency for large volumes.
- Higher structural strength
- Better performance under load
- Lower overall cost
Coating thickness plays a key role. Learn more in our Z275 vs Z140 vs Z450 guide.
How to Choose the Right Material
When selecting materials, consider:
- Project size and type
- Budget constraints
- Environmental conditions
- Structural load requirements
Selecting the right material depends on balancing structural performance, environmental exposure, and project budget. Working with experienced suppliers helps ensure the correct specifications and coating levels are selected for long-term performance.
Speak to CoreMet Steel
CoreMet Steel supplies galvanized steel solutions for solar mounting structures, including C channels, structural sections, and coated steel products. We support global solar projects with competitive pricing and direct mill supply.
Contact CoreMet Steel for:
Solar structure steel supply
- C channels and structural steel
- Galvanized steel products
- Global delivery solutions
Guidance on inspection documents and certification standards is provided by organisations such as the British Standards Institution (BSI), which oversees the adoption of EN standards in the UK.
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