Sungrow SG30CX User Manual page 52

5 Electrical Connection
When more than 15 inverters are connected to the same daisy chain, in order to ensure
the communication quality, the Logger at the first end of the daisy chain needs to be
equipped with a terminal resistor of 120Ω, the inverter at the last end needs to be
equipped with a RS485-dip switch (SW1), and the shielding layer of the communication
cable should be single-point grounded.
The length of the RS485 cable and twisted pair cable should be no longer than
1,200m.
If multiple inverters are connected to the data logger, the number of permissi-
ble daisy chains and the number of devices allowed to be connected should
meet the requirements (refer to the user manual for the data logger).
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f f i i g g u u r r e e 5 5 - - 5 5 Multi-inverter Connection
f f i i g g u u r r e e 5 5 - - 6 6 Configuration of Dip Switch (N≥15)
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