What material are photovoltaic cable trays made of

Photovoltaic cable trays are commonly made from aluminum, galvanized steel, zinc-aluminum-magnesium (ZAM) alloys, and fiber-reinforced plastics, chosen for corrosion resistance, strength, and long-term outdoor durability.Common Materials1. Aluminum: Aluminum trays are lightweight, corrosion-resistant, and ideal for rooftop solar installations where minimizing load is critical. They provide good mechanical strength and are easy to handle and install, making them suitable for both small and large PV systems . 2. Galvanized Steel: Traditional hot-dip galvanized steel trays are widely used due to their strength and cost-effectiveness. They are coated with zinc to resist corrosion, but in harsh environments, their lifespan may be shorter compared to advanced alloys . 3. Zinc-Aluminum-Magnesium (ZAM) Alloy Steel: ZAM trays are made from steel sheets coated with an alloy containing 5–11% aluminum, 2–3% magnesium, and trace silicon. This coating provides superior corrosion resistance, self-healing properties at scratches or cut edges, high strength, and reduced weight. ZAM trays can last 2–5 times longer than traditional galvanized trays, making them ideal for long-term PV installations with a design life exceeding 25 years . 4. Fiber-Reinforced Plastic (FRP): FRP trays are used in environments with high humidity, salt exposure, or continuous water contact. They are lightweight, corrosion-resistant, and electrically non-conductive, which is advantageous for sensitive installations or coastal solar farms .Material Selection ConsiderationsCorrosion Resistance: Outdoor PV systems are exposed to UV, rain, and temperature fluctuations. Materials like ZAM and aluminum provide superior protection against rust and degradation .Mechanical Strength: Trays must support heavy DC cables and withstand wind or vibration. Steel and ZAM alloys offer high load-bearing capacity .Weight: Lightweight materials reduce structural load on rooftops. Aluminum and FRP are preferred for rooftop installations .UV and Weather Resistance: Materials must resist UV-induced cracking and maintain integrity over decades of exposure .Aesthetic and Reflectivity: Low-gloss coatings on ZAM trays minimize sunlight reflection, preventing efficiency loss in PV panels . In summary, aluminum, galvanized steel, ZAM alloy steel, and FRP are the primary materials used for photovoltaic cable trays, with the choice depending on environmental conditions, load requirements, and long-term durability needs. Proper material selection ensures system reliability, reduces maintenance, and extends the lifespan of solar installations .