MPPT grounding, detection of PV array insulation faults & Earth fault alarm notification
The Multi RS19 Solar will test for sufficient resistance isolation between PV+ and GND, and PV- and GND.
In the event of an isolation resistance below the threshold (indicating an earth fault), the inverter shuts down and disables the ac outputs. The MPPT keeps charging the battery as this has no impact on safety due to the isolation on the battery side.
If an audible alarm and/or email notification of this fault is required, then you must also connect a GX device. Email notifications require an internet connection to the GX device and a VRM account to be configured.
The positive and negative conductors of the PV array must be isolated from ground.
Ground the frame of the PV array to local requirements.
The ground lug on the chassis of the Multi RS19 Solar should be connected to the common earth.
The conductor from the ground lug on the chassis of the Multi RS19 Solar to earth should have at least the cross-section of the conductors used for the PV array.
When a PV resistance isolation fault is indicated, do not touch any metal parts and immediately contact a suitably qualified technician to inspect the system for faults.
The battery terminals are galvanically isolated from the PV array. This ensures that PV array voltages cannot leak to the battery side of the system in a fault condition.