Sungrow SG250HX-US, User Manual, Page: 39 / 106

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Item Terminal Mark Note
A PV terminals + / -
24, PV connector
B
Communica-
tion terminal
COM1
RS485 communication, digital input/output DI/
DO, and power supply of tracking system.
COM2
COM3
COM4
COM5 Reserved
C * Conduit hole AC
Opening for AC cable connection with a hole
size of 106mm/4.17inches, suitable for con-
duits of 3–1/2
D
External
grounding
terminal
For reliable grounding of the inverter
*The original sealing plate is suitable for conduits of 3–1/2. In case of conduits of other spec-
ifications, install the provided spare sealing plate. Marks, D1–D4, on the spare sealing plate
correspond to four specifications, as shown in the figure below.
Item
Specification
Trade Size of Conduit
D1 119mm 4
D2 106mm 3–1/2
D3 92mm 3
D4 76mm 2–1/2
5.3 Electrical Connection Overview
The electrical connection should be realized as follows:
User Manual 5 Electrical Connection