User Manual
24
3.6.2 Cable Selection
Name
Label
Recommended Cable
Specifications
Note
PV branch input
cable
1+ ~9(14)+
1- ~9(14)-
Industry general photovoltaic cable,
model: PV1-F.
It is recommended to use 4.0mm
2
copper cable for each PV + and PV
branch.
--
AC output cable
A
、
B
、
C
、
N 4 core outdoor cable (A, B, C, N) or
3 core outdoor copper cable (A, B,
C).
Recommended cross sectional
area of conductor: 35mm
2.
The AC output has only 1 waterproof
locks with a specification of
42mm~50mm.
The output is a
Φ8 terminal. When the
screw is locked, use the sleeve to correct
the force.
RS485
communication
cable
X3-P2
X3-P3
It is recommended to use a special
communication cable or 4-core or
2-core shielded twisted pair cable
with a cross-sectional area of not
less than 0.75mm
2
.
The RS485 communication cable has
only one waterproof lock and the size is
18mm~25mm.
PE ground cable PE
It is recommended to use at least
one grounded dedicated copper
cable with a cross-sectional area of
16 mm
2
.
--
3.6.3 Torque requirement
When tightening the cable connections, the tightening torque needs to meet the requirements of the
table below.
Table 3-1 Threaded tightening torque list
Thread
specification
Performance level 4.8
Performance level 8.8
Unit
General
connection
High tightness
connection
General
connection
High tightness
connection
M3
6
8
kgf.cm
M4
12
14
kgf.cm
M5
25
30
kgf.cm
M6
50
60
kgf.cm
M8
110
150
kgf.cm
M10
300
390
kgf.cm
M12
550
650
kgf.cm
M16
1600
2000
kgf.cm
Note: The internal bolts of our series string inverters with external nominal diameter of 8mm or more are 8.8 grade
Dacromet bolts.
