Sungrow SG20RT User Manual

34
No. Cable
Type
Cable Diameter
Wire Conductor
Cross-section
3 Meter
RS485 cable
(1)
Shielded twisted
pair
5.3 mm–7 mm
2 * (0.5–1.0) mm
2
4
AC cable
(2)
Outdoor 5-core
copper wire cable
SG3.0RT to
SG12RT,
SG5.0RT–P2 to
SG12RT–P2: 10
mm–21 mm
SG3.0RT to SG12RT,
SG5.0RT–P2 to
SG12RT–P2: 4 mm
2
–
6 mm
2
SG15RT to
SG20RT, SG15RT–
P2 to SG20RT–P2:
14 mm–25 mm
SG15RT to SG20RT,
SG15RT–P2 to
SG20RT–P2: 6 mm
2
–
10 mm
2
5
Additional
Grounding
cable
Outdoor single-core
copper wire cable
The same as that of the PE wire in the AC
cable
(1) The cable requirements for COM2 terminal connection are the same.
(2) All the AC wires should be equipped with correctly colored cables for distinguishing.
Please refer to related standards about the wiring color.
5.4 External Protective Grounding Connection
Electric shock!
• Make sure that the grounding cable is connected reliably. Otherwise, it may
cause electric shock.
• Since the inverter is not equipped with a transformer, neither the negative elec-
trode nor the positive electrode of the PV string can be grounded. Otherwise,
the inverter will not operate normally.
• Connect the grounding terminal to the external protective grounding point be-
fore AC cable connection, PV string connection, and communication cable
connection.
• The external protective grounding point provides a reliable ground connection.
Do not use an improper grounding conductor for grounding, Otherwise, it may
cause product damage or personal injury.
• Depending on Local Rules, please also ground the PV panel subconstruction to
the same common grounding point (PE Bar) in addition to local lightning pro-
tection rules.
5 Electrical Connection User Manual

Sungrow SG20RT Specifications

General

Model	SG20RT
Category	Inverter
Max. DC Voltage	1100 V
Rated AC Power Output	20 kW
Max. Efficiency	98.6%
Max. DC Input Power	30 kW
Max. Input Voltage	1100 V
Start Voltage	200 V
Number of MPPTs	2
Number of DC Inputs per MPPT	2
Max. AC Apparent Power	22 kVA
Rated Grid Frequency	50 Hz / 60 Hz
Max. Output Current	32 A
Power Factor at Rated Power	>0.99
THDi	<3%
DC Switch	Yes
Protection Class	IP65
Cooling Method	Natural Convection
Protection Degree	IP65
Protection Level	IP65
MPPT Voltage Range	200 V - 1000 V
Operating Temperature Range	-25°C to +60°C
Input Voltage Range	200 V - 1000 V
MPPT Range	200 V - 1000 V
AC Voltage Range	310 V - 480 V