User Guide

Creating 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 13.
RS485 wiring specifications:
Cable type: CAT6 and higher with shielding protection of the twisted pairs of wires
and an outer foil or braided shielding
Wire cross-section area: 0.2- 1mm²
Maximum nodes: 32
Maximum distance between first and last devices: 1000m.
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; make sure the grounding wire is not in contact with other
wires. For inverters with a Connection Unit, connect the grounding wire to the
grounding bus-bar in the Connection 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
Communication Board for Inverters with SetApp Configuration
11 Creating RS485 Bus Connection