Note
Caution
Danger
PV modules generate electric energy when exposed to sunlight and can
create an electrical shock hazard. Therefore, when connecting DC input
power cable, cover PV modules by using opaque cloth.
Before performing electrical connections, ensure that voltages of the DC
cables should be within the safe voltage range, that is, lower than 60 V
DC, and the DC SWITCH is OFF. Otherwise, the high voltage may result
in fatal danger.
PV modules connected in series in each PV array are of the same specifications.
The open-circuit voltage of each PV array is always lower than or equal to 1100 V DC.
The open-circuit voltage of each PV array is always lower than or equal to 15 A DC.
The output power of each PV array is always less than or equal to the maximum input
power of the 20~33KTL-G2.
The positive and negative terminals of PV arrays connect to the positive and negative
DC input terminals respectively.
Ensure that the following conditions are met. Otherwise, fire accident may occur.
If the 20~33KTL-G2 connects to the power grid directly, ensure that the
PV arrays are not grounded.
If the DC voltage is a non-zero value between the positive terminal of PV
arrays and the ground, the PV arrays are subject to insulation faults.
Rectify the fault before connecting cables.
During PV array and 20~33KTL-G2 installation, the positive or
negative terminals of PV arrays may be grounded if power cables are
not properly installed or routed. In this case, an DC short circuit may
occur and damage the 20~33KTL-G2.
If the PV arrays need to be grounded, install a three-phase four-wire
isolation transformer on the output side and disable the ISO detection
function by referring to 6.2.10 Setting Isolation Parameters. If an
isolation transformer is not installed, the 20~33KTL-G2 may be
damaged.
Context
Cross-Sectional Area (mm)
4
.
0
~
6
.
0
Recommended Value
Range
4
.
0
External Cable Diameter(mm)
4
.
5
~
7
.
8
DC input connectors are classified into positive and negative connectors, as shown in Figure
4-24 and Figure 4-25.
1. Housing 2. Cable gland 3. Positive connector
1. Housing 2. Cable gland 3. Negative connector
Table 4-6 Recommended DC input cable specifications
Figure 4-23 Positive connector composition
Figure 4-24 Negative connector composition
Positive and negative metal terminals are packed with positive and negative connectors
respectively. Separate the positive from negative metal terminals after unpacking the
20~33KTL-G2
to avoid confusing the polarities.
Note
37
38
DC connection between inverter and string panel should be specified PV cable. Line voltage
drop should be less than 2% from junction box to inverter.Inverter is recommended to be
installed on or near PV panel bracket , which can save cable and reduce DC loss.
Note
Check polarity of PV array, to ensure the correct wiring of PV array;
Please don't put the positive or negative of the PV array connect to
earth.
20~33KTL-G2
User manual
20~33KTL-G2
User manual
