5 Electrical Connection
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5 Electrical Connection
5.1 Safety
Prior to any electrical connections, keep in mind that the inverter has dual power supplies.
It is mandatory for the qualified personnel to wear personal protective equipments (PPE) during the electrical work.
DANGER
• Danger to life due to a high voltage inside the inverter!
• The PV string will generate lethal high voltage when exposed to sunlight.
• Before starting electrical connections, disconnect the DC and AC circuit. breakers and
prevent them from inadvertent reconnection.
• Ensure that all cables are voltage free before performing cable connection.
WARNING
• Any improper operations during cable connection can cause device damage or personal injury.
• Only qualified personnel can perform cable connection.
• All cables must be undamaged, firmly attached, properly insulated and adequately
dimensioned.
NOTICE
• Comply with the safety instructions related to the PV strings and the regulations related to
the utility grid.
• All electrical connections must be in accordance with local and nationalstandards.
• Only with the permission of the utility grid, the inverter can be connected to the utility grid.
5.2 Electrical Connection Overview
Electrical connection in the PV system includes additional grounding connection, AC connection, and PV string
connection.
1
2
3
4
A
B
C
D
E
5
A
）
PV string; B
）
Inverter; C
）
AC distribution box/cabinet; D
）
Utility grid; E
）
Monitoring device
FIG 5-1 General electrical connection diagram
Table 5-1 Recommended Cables
No.
Cable Name
Cable Type
Conductor Cross-Sectional Area
Outer
Diameter
1
DC cable
PV cable, complying with 1500V
standard
4~6mm
²
6~9mm
2
Additional
Grounding cable
Outdoor single core copper
conductor cable
The same as that of the PE wire in
the AC cable
N/A
3
AC cable
Four/Five-core outdoor copper or
aluminum cables*
1) 75KW: 4 or 5 x 50~185 mm
²
75KW: 3 x 240+1 x 120mm
²
2) 100~120KW: 4 or 5 x 70~185 mm
²
100~120KW: 3 x 240+1 x 120mm
²
26~57mm
PE wire: refer to
"table
5-
2
PE
wire
requirements"
4
Communication
cable
Shielded twisted pair (terminal
block)
0.5~1.5 mm
²
4.5~6.5mm
CAT-5 Ethernet cable (RJ45)
N/A
5
Wireless
communication
N/A
N/A
N/A
