I have looked at other schematics and the chassis ground from mppt and inverter go back to the negative busbar. Is this all or does the negative busbar then have to be attached to an earth rod outside? Mine is an off-grid setup in a workshop?
asked
Earth ground
The simplest solution to this is to connect the GROUND stud on the inverter chassis to the Earth Rod. This will automatically ground most of that which needs grounding, whilst avoiding earth loops. Then check for continuity to : MPPT Chassis ground stud, and PV Frame grounding. PV Frame ground should also be taken to the earth stud, and the MPPT chassis, if floating, should be taken to the -ve bus.
