Solar brackets, also known as mounting brackets or racking systems, are typically made of sturdy and durable materials that can withstand outdoor conditions and provide secure support for the panels. The most common materials used for solar panel brackets are:

1. Aluminum: Aluminum is a popular choice for solar panel brackets due to its lightweight nature and excellent corrosion resistance. It is strong, durable, and resistant to rust, making it suitable for outdoor applications. Aluminum brackets are often used in residential and commercial solar installations.

2. Steel: Steel is another material commonly used for solar panel brackets. It offers high strength and durability, providing robust support for the panels. Steel brackets are particularly suitable for large-scale solar projects where additional structural strength is required.

3. Stainless Steel: Stainless steel is a corrosion-resistant alloy that is commonly used for solar panel brackets in areas with high humidity or saltwater exposure. It offers excellent resistance to rust and provides long-lasting support for solar panels.

      These materials are chosen for their strength, durability, and resistance to environmental factors such as moisture, UV radiation, and temperature fluctuations. The specific choice of material may vary based on factors such as the installation location, load requirements, and manufacturer specifications.