Case Study: Heavy-Duty 4-Car Waterproof Carbon Steel Solar Carport Deployed in Thailand

Designing a solar carport for tropical regions like Southeast Asia requires far more than simply mounting panels overhead. Intense seasonal monsoons, high humidity, and the need for unobstructed parking clearance demand a structure that balances heavy-duty mechanical strength with precision water management.

Recently, a 4-car waterproof solar carport engineered and manufactured by Xiamen Wanhos Solar Technology Co., Ltd. was successfully installed in Thailand, offering a practical blueprint for dual-purpose clean energy infrastructure.

Site Requirements and Engineering Challenges

The project site-a spacious private estate surrounded by lush greenery-needed covered parking for four vehicles alongside a high-efficiency rooftop-style PV array. Because Thailand experiences heavy tropical downpours throughout the monsoon season, standard open-gap solar racking was not an option. Any water leakage between module joints would compromise vehicle protection and expose underside electrical wiring to moisture. Furthermore, the client required wide-span cantilever support to allow easy vehicle entry and exit without dense interior columns.

The Wanhos Waterproof Carbon Steel Solution

To meet these structural and environmental requirements, Wanhos engineers developed a customized 4-car waterproof carport system manufactured at our 20,000-square-meter production facility in China:

Hot-Dip Galvanized Carbon Steel Frame: The primary beams, angled support struts, and columns were fabricated from high-strength Q235B carbon steel with heavy-duty hot-dip galvanization. This ensures superior structural rigidity across a wide 4-car span while providing long-term corrosion resistance in humid climates.

Integrated Waterproof Drainage System: Rather than relying on temporary sealants, the structure incorporates dedicated water-guiding channels and sealed purlin joints beneath the solar modules. Rainwater is channeled cleanly toward the perimeter gutters, keeping the parking area and underside junction boxes completely dry.

Clean Electrical and Conduit Integration: As seen in the completed installation, the structural columns and beams provide clean pathways for DC cabling and combiner box mounting, ensuring neat wire management and simplified maintenance.