Considerations for the proper integration of DC PV connectors into single-axis tracker applications

• Primarily at the end of row and/or in between tracker tables.
• Low-stranded conductors with limited flexibility

• Inadequately secured connectors may be exposed to cyclical mechanical loading and movements, that could induce fretting or excessive contact surface wear. This could lead to a shortened life expectancy and premature failure, imposing significant risks to PV assets.
• PV connectors should be protected from dynamic movement and mechanical stress, such as those caused by moving components of a PV tracker system by utilizing proper cable management installation techniques.

The strain relief measures described in the installation instructions aim to mechanically decouple the electrical contact from any possible static or dynamic load caused and induced by the installation or external factors, to prevent relative movement of the electrical contact. Any such relative movement may lead to an accelerated deterioration of the electrical contact itself, generating more heat, therefore causing higher temperatures, and possibly reducing the life expectancy of the connector. Larger and stiffer cables, as often used in eBOS applications for high-powered PV modules, are more susceptible to inducing such relative movement than smaller and more flexible cables.

Follow all instructions of the assembly instruction and pay particular attention to the following:

Mechanical Isolation of Connector

When integrating a PV connector into an application where mechanical load is expected, assure the connector is appropriately secured and decoupled from both static and dynamic mechanical loads (for example: strain, bending load, torsion, and translational movement).

Connector placement

Place connectors in areas where no mechanical movement occurs. For example, do not install unsecured connectors between the DC collection and end of row so that the connectors hang freely as part of a dynamically moving cabling section.

Choose Flexible Conductors

Make use of high-flexible (highly flexible or high flexibility - unless “high-flexible” is a term of art) PV conductors in areas of constant movement (typically end of row and in between tracker tables). Be sure to follow the specific assembly and installation instructions and guidelines for such conductors.

Best practices

Follow best practices for wire management and connector system integration as explained in the assembly instructions provided with the PV connectors, as well as in system integration advisories, product guides, and all other product information.