Why Do Solar Mounting Structures Rust? Causes and Prevention Methods

What Is a Solar Mounting Structure?

A solar mounting structure is the supporting frame that holds the solar panels in place. It allows panels to be installed at the correct angle and direction for maximum sunlight capture.

These structures vary depending on the installation type:

• Ground-mounted
• Agricultural-mounted
• Roof-mounted
• Carport-mounted

Designing the right solar racking system involves adapting to local weather, terrain, and application needs to ensure durability and stability.

👉 Learn more about Ground Solar Mounting Systems
👉 Explore our Agricultural Solar Mounting Solutions
👉 See our Roof Solar Mounting Systems

Causes of Rust in Solar Mounting Structures

1. Aging and Environmental Exposure

Over time, continuous exposure to the elements—rain, snow, UV rays, and temperature swings—causes material fatigue and oxidation.

2. Installation in Coastal or Salt-Heavy Areas

Salt-laden air or moisture accelerates rusting, especially for metal parts not treated for corrosion resistance.

Example: Coastal solar installations face higher risk if using standard steel without protective coating.

3. Galvanic Corrosion Between Dissimilar Metals

When different metals (e.g., aluminum and steel) come into contact, it can lead to galvanic corrosion, where one metal deteriorates faster.

4. Poor Base Preparation or Soil Conditions

Improper soil assessment or presence of corrosive chemicals in the foundation can lead to rust from underneath.

How to Prevent Rust on Solar Mounting Structures

1. Avoid Mixing Dissimilar Metals

Choose the same type of metal throughout or use proper insulators to prevent galvanic reactions.

2. Avoid Installing in Heavy Salt Regions (If Possible)

Where feasible, avoid investing in solar installations in heavy salt-damage regions or opt for special protective materials.

3. Use Anti-Rust Coatings

Applying anti-corrosion coatings specifically designed for solar mounting systems protects surfaces from water, salt, and air exposure.

4. Regular Maintenance and Inspection Services

Partner with professional maintenance services specializing in solar systems. Regular checks can detect early signs of corrosion and prevent failures.

Need parts for maintenance? Explore our ソーラーマウント・アクセサリー

5. Choose Corrosion-Resistant Materials

Opt for materials like hot-dip galvanized steel, anodized aluminumあるいは stainless steel for maximum corrosion resistance.

• Hot Dip Galvanized C-Channel Brackets
• アルミニウム地中埋込型 - ねじ杭基礎
• Stainless Steel Grounding Clips

What Happens If Rust Progresses?

Unchecked rust doesn’t just affect appearance—it compromises structural integrity. This can lead to:

• Lower solar output
• Damage to panel connectors
• Complete rack collapse in extreme cases
• Costly system overhauls or replacements

Early detection and consistent rust prevention are key to long-term system safety and efficiency.

Summary: 5 Key Anti-Rust Strategies

To recap, here are five effective methods to prevent rust on solar panel racking systems:

1. Avoid contact between different metals
2. Avoid installations in high-salt areas
3. Use anti-corrosion paints or coatings
4. Schedule regular inspections
5. Select high-grade corrosion-resistant materials

Partner with Firstsolar for Trusted Solar Materials

Looking for reliable materials and professional solar solutions? At Firstsolar, we specialize in solar racking systems built for performance and durability in all environments.

👉 Browse our Solar Ballasted Roof Mounting Systems
👉 Explore Solar Carport Mounting Options
👉 Need more flexibility? Check our フローティング・ソーラー・マウント・システム

Let us help protect your solar investment for the long term.