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Selectronic Australia
Rev 41 - Dec 2022
Installation
Communications Between SP PRO and Selectronic Certified Inverters
The RS485 communications link between the SP PRO and Selectronic Certified inverters can be either a wired
link (using Cat 5 cable) or a wireless link (using the optional Selectronic wireless RS485 link, stock code
005075 for Fronius SCERT, stock code 005316 for the ABB UNO SCERT, or stock code 005326 for
SelectSun).
Line Diagram for Single-phase Managed AC Coupling
The below diagrams detail the AC wiring requirements for Managed AC Coupled systems.
Please note that when a Managed AC Coupled system is installed in a Solar Hybrid system with an existing
grid-connected PV system that is not an SCERT (generic solar inverter) then the generic inverter is normally
connected to the grid side of the system (see diagram below). The generic inverter may be connected to the
Load side of the SP PRO when the AC output of the generic inverter is less than the continuous rating of the
SP PRO, and the combined AC output of both the generic and SCERT solar inverters is less than twice the
continuous rating of the SP PRO.
System Configuration
Line Diagram for Managed AC Coupling – Off-Grid System
Diagram given as a reference only. Please ensure all wiring complies with relevant safety standards.
Line Diagram for Managed AC Coupling – Solar Hybrid (Grid Connected) System
Diagram given as a reference only. Please ensure all wiring complies with relevant safety standards.