The “nemesis” of loose photovoltaic connector nuts—ratchet anti-loosening mechanism

Release date:

2025-01-24 09:44

01
The Importance of Connectors
The photovoltaic (PV) industry, as a key component of the new‑energy sector, has experienced rapid growth worldwide in recent years. Driven by global commitments to low‑carbon development, supportive national policies, and advances in corporate technology, China’s new‑energy industry has achieved remarkable results on the international stage. Nevertheless, the reliability of PV systems continues to face numerous challenges. Connector failures remain one of the most critical safety concerns in PV installations. According to industry research reports, connector‑related faults account for as much as 38% of all failures in PV power plants, with approximately 30% of these attributable to loose connections or poor contact.
In photovoltaic systems, connectors are critical components that ensure safe and stable power transmission. They typically consist of parts such as nuts, connector bodies, male and female contacts, sealing rings, and sealing sleeves. One function of the nut is to secure the cable, ensuring reliable electrical contact; another is to provide waterproofing through its配合 with the seals. During installation and operation, factors such as improper handling or assembly, external vibrations, and thermal expansion and contraction caused by environmental conditions can lead to nut loosening or detachment. This, in turn, compromises the product’s waterproof integrity, causes leakage at metallic conductive parts, and may ultimately result in fires.

02
Tongtai Connector Ratchet Anti-Loosening Mechanism
To address the issue of nut loosening in photovoltaic connectors, Tongtai has developed a ratchet‑type anti‑loosening mechanism and integrated it into the connector. The key feature of this mechanism is that it allows free rotation in one direction while restricting movement in the opposite direction. The ratchet design effectively prevents loosening, ensuring that the connector remains securely fastened under external forces and thereby guaranteeing the stable operation of the photovoltaic system. This solution not only mitigates the risk of failure caused by disengagement between the connector body and the nut but also facilitates large‑scale automated manufacturing.

03
Conclusion
This anti-loosening mechanism is widely employed across Tongtai’s range of photovoltaic connectors, delivering enduring reliability and high‑efficiency stability. Tongtai was the first to file a patent for this anti‑loosening design. Today, Tongtai’s best‑selling photovoltaic connectors are ubiquitous in the market. Backed by Tongtai’s superior structural engineering, they jointly support the efficient operation and steady growth of photovoltaic systems.
The detailed description of this invention patent can be found in patents No. 201520097025.8 and 201510071220.8.