Balance of Systems

Modular Trunk Cable with Self-Termination Construction

The trunk cabling portion of a microinverter system is extremely important since it directly impacts labor costs at an installation site. The Chilicon modular trunk and branch cabling system incorporates industry standard VNTC tray cable with a UV and cut resistant outer jacket. Each 'modular' component of the the 4 conductor cableplugs together right on the job site. For the first time, you can mix landscape and portrait mode PV module layouts side-by-side on the same string. In addition, the trunk cable is 'Self-Terminating' as shown in the figure below. There is no longer a need to procure 'termination caps' for the end of each microinverter string. 

Integrated Grounding 

Chilicon Power inverters feature Integrated (DC isolated) Ground. Because the DC circuit is isolated and insulated from ground, these microinverters do not require a Grounding Electrode Conductor (GEC) connected between each microinverter. This means you don’t need to attach a separate copper grounding conductor to each microinverter or worry about a continuous run to ground. 

Electrical code requires two types of grounding conductors: the Grounding Electrode Conductor (GEC), which is used between the grounding electrode and the point where a normally current carrying conductor is intentionally bonded to ground and the Equipment Grounding Conductor (EGC), which grounds noncurrent carrying metal parts of the system, such as the racking and module frames. Because Chilicon Power microinverters have DC integrated (isolated) ground, they do not require a GEC. However electrical code still requires that exposed metal in the array be grounded (NEC 690.43 and 250.136(A)). This requirement is met for the microinverter because the ground conductor internal to the modular trunk cable acts as the EGC. It may be met for racking and modules with use of an EGC or WEEBs to provide bonding to this ground system.

 

Diagram of the modular trunk cable components and a self-terminating layout

 

 

ModularTrunkCableComponents

SelfTerminating Trunk Cable