Creating An Rs485 Bus Connection - SolarEdge SE8000H-AU Installation Manual

Creating an RS485 Bus Connection

Creating an RS485 Bus Connection
The RS485 option enables creating a bus of connected inverters, consisting of up to 31 slave inverters and
1 master 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 52.
RS485 wiring specifications:
Cable type: Min. 3-wire shielded twisted pair (a shielded Ethernet cable (Cat5/5E STP) may be used)
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Wire cross-section area: 0.2- 1 mm²/ 24-18 AWG (a CAT5 cable may be used)
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Maximum nodes: 32
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Maximum distance between first and last devices: 1 km /3300 ft.
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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 recommend to use external surge protection
devices. For details refer to:
https://www.solaredge.com/sites/default/files/lightning_surge_protection.pdf.
If grounded metal conduit 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 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
configuration of multiple RS485 buses for communications in large sites; 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:
1. Remove the inverter cover as described in Removing the Inverter Cover on page 46.
2. Remove the seal from one of the openings in communication gland and insert the wire through the
opening.
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Single Phase Inverter with HD-Wave Technology Installation MAN-01-250-1.2