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Requirements for Steel Properties in Solar Energy Mounting Systems

2025-10-29

Tensile Strength and Yield PointA high yield point can reduce the cross-section of steel members, lighten the structural self-weight, save steel materials, and lower the overall project cost. A high tensile strength can increase the overall safety reserve of the structure and improve its reliability.
Plasticity, Toughness, and Fatigue ResistanceGood plasticity enables the structure to undergo significant deformation before failure, facilitating timely detection and implementation of remedial measures. It also helps adjust local peak stresses. For solar panel installation, forced installation is often used to adjust angles; plasticity allows the structure to achieve internal force redistribution, making the stress at previously stress-concentrated parts of the structure or members more uniform and enhancing the overall load-bearing capacity.

Good toughness enables the structure to absorb more energy when damaged under impact loads. This is particularly critical for desert power stations and rooftop power stations with strong winds, where wind vibration effects are prominent—steel toughness can effectively reduce risks. Good fatigue resistance also equips the structure with strong capability to withstand alternating and repeated wind loads.

ProcessabilityGood processability includes cold workability, hot workability, and weldability. The steel used in photovoltaic steel structures must not only be easy to process into various structural forms and components but also ensure that these structures and components do not suffer excessive adverse impacts on strength, plasticity, toughness, or fatigue resistance due to processing.
Service LifeSince the design service life of solar photovoltaic systems is over 20 years, good corrosion resistance is also a key indicator for evaluating the quality of mounting systems. A short service life of the mount will inevitably affect the stability of the entire structure, prolong the investment payback period, and reduce the economic benefits of the entire project.
Practicality and EconomyOn the premise of meeting the above requirements, the steel used in photovoltaic steel structures should also be easy to purchase and produce, and at a low cost.

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