The Sans Regulations supersedes the inverters installation manual, the documents state that all installs should adhere to Sans10142
the bonding relay would make this a non compliant installation as the regulations require a permanent earth neutral bond on the output side of an alternate supply source before it is wired to the changeover switch input.
Non essential/essential loads needs a separate neutral bar, the inverter must have a separate grounding rod, reason being if the changeover is switched to the inverter the Bond is broken on the utility side and effectively on all essential loads if there is no earth spike with a bond the inverter wont have a zero voltage reference.