EVVO 20000TLG23P~EVVO 33000TLG23P
EVVO 20000TLG23P~EVVO 33000TLG23P
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 near PV panel bracket, which can save cable and reduce DC loss.
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.
Note
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.
Danger
Ensure that the following conditions are met. Otherwise, fire accident may occur.
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 1000 V DC. The
open-circuit Current 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 inverter.
The positive and negative terminals of PV arrays connect to the positive and negative DC
input terminals respectively.
Caution
If the inverter 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 the inverter 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 inverter.
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 inverter may be damaged.
Note
Context
Table 4-6 Recommended DC input cable specifications
Cross-Sectional Area (mm)
External Cable Diameter(mm)
Range
Recommended Value
4
.
0
~
6
.
0
4
.
0
4
.
5
~
7
.
8
DC input connectors are classified into positive and negative connectors, as shown in Figure
4-24 and Figure 4-25.
Figure 4-23 Positive connector composition
1. Housing 2. Cable gland 3. Positive connector
Figure 4-24 Negative connector composition
1. Housing 2. Cable gland 3. Negative connector
Note
Positive and negative metal terminals are packed with positive and negative connectors
respectively. Separate the positive from negative metal terminals after unpacking the inverter
to avoid confusing the polarities.
