A PV solar end clamp is a mechanical fastening device used to secure the terminal solar modules at the ends of a mounting rail to the supporting structure. Its defining characteristic is its asymmetric design: one side of the clamp is shaped to hold the module frame, while the opposite side provides a finished, flush termination for the array .

Core Functional Principles

• Module Retention at Array Ends: The primary function is to clamp the frame of the first and last module in a row securely to the mounting rail, preventing movement due to wind uplift, gravity, or thermal expansion .

• Array Termination: End clamps provide a clean, finished appearance to the ends of the solar array, covering the rail ends and presenting a professional look .

• Grounding Path Establishment: Many end clamps incorporate features (such as penetrating teeth or conductive components) to establish an electrical bond between the module frame and the mounting rail, contributing to the system's equipment grounding path .

Material Composition

• High-Strength Aluminum Alloy: The main body is typically die-cast or machined from corrosion-resistant aluminum alloys, commonly AL6005-T5 or 6061-T6 . This provides:

• Structural Strength: Withstands clamping forces and environmental loads .

• Light Weight: Ease of handling during installation .

• Corrosion Resistance: Natural oxide layer protects against weathering .

• Stainless Steel Hardware: The clamping bolt (and any integrated threaded components) is made from stainless steel (SUS304 or A2) to prevent galvanic corrosion and ensure long-term clamping force .