Creating An Rs485 Bus Connection - SolarEdge SE3K-RWB Installation Manual

Creating an RS485 Bus Connection

The RS485 option enables creating a bus of connected inverters, consisting of up to 31
follower inverters and 1 leader inverter. Using this option, inverters are connected to
each other in a bus (chain), via their RS485 connectors. The first and last inverters in the
chain must be terminated as described on page 75.
RS485 wiring specifications:
Cable type: Min. 3-wire shielded twisted pair (a shielded Ethernet cable (Cat5/5E
STP) may be used)
Wire cross-section area: 0.2- 1 mm²/ 24-18 AWG (a CAT5 cable may be used)
Maximum nodes: 32
Maximum distance between first and last devices: 1 km /3300 ft.
NOTE
If using a cable longer than 10 m/33 ft in areas where there is a
risk of induced voltage surges by lightning, it is recommended
to use external surge protection devices. For details refer to:
https://www.solaredge.com/sites/default/files/lightning_
surge_protection.pdf.
If grounded metal conduits are used for routing the communication wires, a
lightning protection device is not required.
If not using surge protection, connect the grounding wire to the first inverter
in the RS485 chain; ensure it is not in contact with other wires. For inverters
with a DC Safety Unit, connect the grounding wire to the grounding bus-bar
in the DC Safety Unit.
NOTE
An additional RS485 port (RS485-Plug-in) is available from
SolarEdge, allowing the creation of RS485 Bus Connection; Refer
to http://www.solaredge.com/files/pdfs/RS485_expansion_kit_
installation_guide.pdf
The following sections describe how to physically connect the RS485 bus and how to
configure the bus.
To connect the RS485 communication bus:
Three Phase System MAN-01-00507-4.2
Chapter 7: Setting Up Communication to the Monitoring Platform 73