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User Manual of String Inverter
20
3.6 Electrical connection
3.6.1 Cable requirements
The selection of cables should meet the relevant national standards and can meet the load
requirements.

Power cable requirements
Select the cable specifications refer to the electrical data in the product data and the
environmental temperature, current, margin and other factors.

Communication cable requirements
Because the weak communication signal is susceptible to external interference, the
communication cable needs to use a cable with a shielding layer, and ground the shielding layer
as shown in the following figure. You can also refer to the relevant document "GB 50217-2007
Cable Design Code".
(a) Double shielded twisted pair
When the cable is double insulated and shielded, both ends of
the outermost shield are grounded, one end of the inner shield is
equipotential grounded
(b) Single shielded twisted pair
When the cable is single insulated and shielded, in order to
prevent the formation of a potential difference, one end of the
shield should be equipotential grounded.
Figure 3-6 Twisted pair with shielding
3.6.2 Recommended cable specifications
Name Recommended Cable Specifications Remarks
PV branch input cable
Industry general PV cable, model: PV1-F
It is recommended to use a cable with a
cross-section of 4.0mm2 for each PV+
and PV- branch.
/
AC output cable
Model
4 core copper
wire
(recommended)
4 core
aluminum wire
(recommended)
AC output
Waterproof lock specifications
8-12kW 10mm
2
16mm
2
≤
18mm
15-17kW 16mm
2
25mm
2
≤
21mm
20-22kW 25mm 2 35mm 2
≤
21mm
25-33kW 35mm 2 50mm 2
≤
32mm
PE ground cable
It is recommended to use at least one
grounded dedicated cable with a
cross-sectional area of 16mm
2
.
/