2026-08-24
Rooftop photovoltaic systems may encounter various faults during long‑term operation, such as bracket loosening, rail corrosion and roof water leakage. These issues will reduce power‑generation efficiency and even trigger potential safety hazards. Drawing on rich after‑sales maintenance experience from numerous overseas projects, Zhongtang Group sorts out root‑cause analysis and practical implementation solutions for three typical scenarios: color‑steel tile roofs, concrete roofs and standing‑seam roofs, enabling customers to quickly identify and resolve system failures.
Bracket loosening ranks among the most frequent faults for rooftop PV installations. Primary causes include insufficient torque of high‑strength bolts, nut back‑off induced by wind‑induced vibration, and poor fit between T‑clamps and mounting rails.
Zhongtang Group recommends regular bolt‑torque inspections to ensure Grade 8.8 and Grade 10.9 high‑strength bolts are tightened to specified torque values. For regions exposed to frequent strong winds, spring washers or toothed lock washers can be fitted to prevent nut loosening. All PV bracket accessories supplied by Zhongtang Group have passed rigorous torque testing and anti‑loosening verification, substantially mitigating the risk of bracket loosening.
Rail corrosion is a critical factor shortening the service life of rooftop PV systems. Corrosion mostly occurs at cutting sections, drilled holes and zinc‑coating damaged areas, and becomes aggravated in coastal high‑salt‑fog zones or industrial acid‑rain environments.
Zhongtang Group’s solutions: all bracket profiles adopt hot‑dip galvanizing treatment. Cutting ends and bore holes shall be repaired with zinc‑rich primer. For heavily corrosive environments, aluminum‑alloy brackets or carbon‑steel brackets with zinc coating thickness above 80 μm are recommended. Besides, Zhongtang Group provides rail corrosion inspection and replacement services to extend the overall service life of rooftop PV systems.
Roof water leakage is a high‑risk concern in PV installation work. It generally stems from improper waterproofing during hook mounting, aged sealant, or corrosion at roof penetration holes.
Zhongtang Group’s PV hooks adopt a dual waterproof structure combining waterproof gaskets and sealant. Construction shall be performed in strict accordance with installation specifications to guarantee waterproof performance at penetration points. For existing leaking projects, our technical team conducts on‑site surveys and delivers targeted repair proposals, including waterproof component replacement and re‑sealing treatment.
Zhongtang Group also offers periodic inspection and maintenance services for overseas rooftop PV projects. Project files are established to detect hidden risks in advance and implement timely rectification. Supported by professional technical assistance and comprehensive after‑sales support, Zhongtang Group guarantees long‑term and stable operation of customers’ rooftop photovoltaic systems.
