PV mounting structures: Outdoor service life requirements of 25 years; for coastal projects, 316L or aluminized-zinc + coating is recommended; for inland areas, 304 can be used.

Hydrogen energy equipment: High-pressure hydrogen storage vessels and piping require high strength and resistance to hydrogen embrittlement; 316L or special stainless steels are commonly used, and hydrogen environment compatibility assessment must be performed according to standards.

Energy storage cabinets: Outdoor enclosures mostly use 304 or galvanized sheet + coating; 316L is recommended for coastal areas.

Battery casings: Some use 300-series stainless steel, requiring formability and weldability, with thickness of 0.3-1.0 mm.

Key point: New energy projects are sensitive to service life and maintenance costs; material selection should involve full life-cycle cost analysis rather than looking only at unit price.