Steel vs. Aluminum: Choosing the Best Material for Solar Mounting

Why Material Matters for Solar Systems

When you build a solar system, the materials you choose are very important.
The structure must hold the panels safely for 25 years or more.
It must also survive strong winds, heavy snow, and even earthquakes.

In some places, like Japan or near the ocean in China, choosing the wrong material can cause big problems — and big costs — later.

Steel and Aluminum: What’s the Difference?

Steel: Strong and Tough

Steel is very strong. It can hold heavy loads and stay strong in bad weather.

Best for:

• Ground-mounted solar farms
• Areas with lots of snow or strong winds
• Places where cost matters a lot

👉 Related Product: C – Steel Ground Mount – Screw Pile Foundation

Aluminum: Light and Rust-Free

Aluminum is much lighter than steel. It does not rust easily.

Best for:

• Rooftop solar systems
• Coastal areas with salty air
• Projects that need fast installation

👉 See: 屋根設置型ソーラーシステム

What About the Costs?

Steel is cheaper to buy.
But if you use steel near the ocean, it may rust. You will need to repaint or fix it.

Aluminum costs more at first, but needs less care later.
In some coastal projects, aluminum ended up saving money over 25 years.

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When Should You Pick Steel or Aluminum?

Some projects mix both.
For example, using steel posts and aluminum rails.
This saves money and still keeps good quality.

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Real Project Stories

In snowy parts of Japan, strong steel frames keep solar panels safe even with 3 meters of snow.
In Southeast Asia, light aluminum racks work better because it rains and the air is salty.

Every project is different.
What works in one place may fail in another.

Final Thoughts

There is no one best answer.
Steel and aluminum each have strengths.
Think about the weather, the ground, the costs, and the future.

A good choice today will keep your solar panels safe and strong for many years.