Grounding each component correctly is crucial for the system's safety and functionality. Follow these specific instructions for each component:
Junction box chassis grounding
Ground the frame of the Junction box.
PV array grounding
The positive and negative of the PV array should not be grounded. Ground the frame of the PV panels to reduce the impact of lightning. Do not connect the solar charger to a grounded PV array. Only one ground connection is allowed, and this should be near the battery.
Ground fault detection
The solar charger does not have internal ground fault protection. The USA National Electrical Code (NEC) requires the use of an external ground fault protection device (GFPD). The system electrical negative should be bonded through a GFPD to earth ground at one (and only one) location. When a ground fault is indicated, battery terminals and connected circuits may be un-grounded and hazardous.