1
2
3
Prerequisites:
The PGND cables are prepared (8 AWG outdoor power cables are recommended for
grounding purposes).
Procedure:
Step 1
Remove the insulation layer with an appropriate length using a wire stripper, as shown
in Figure 4-3.
L2=L1+(2-3)mm
L1
Note
：
L2 is 2 to 3mm longer than L1
4.1 Electrical connection
Start
4.2 Connecting PGND Cables
Connect the Sofar 30~40KTL to the grounding electrode using protection ground (PGND)
cables for grounding purposes.
Note:
Good grounding for the Sofar 30~40KTL can help resist the impact of the surge voltage and improve the EMI
performance. First connect the PGND cable before connecting the AC power cable, DC power cable, and
communication cable.
For the system with one Sofar 30~40KTL, connect the PGND cable to the ground. For the system with
multiple Sofar 30~40KTL, connect the PGND cables of all Sofar 30~40KTL to the grounding electrode using
equipotential bonding.
If the installation location is near the ground, first connect the PGND cable to the ground before installing the
Sofar 30~40KTL on the wall.
Sofar 30~40KTL M5 welded stud
Step 2
Insert the exposed core wires into the OT terminal and crimp them by using a crimping
tool, as shown in Figure 4-4.
L3<2mm
L4<1.5mm
Note 1:
L3 is the length between the insulation layer of the ground cable and the crimped part.L4 is the distance between the
crimped part and core wires protruding from the crimped part.
Note 2:
The cavity formed after crimping the conductor crimp strip shall wrap the core wires completely. The core wires shall
contact the terminal closely.
Step 3
Install the crimped OT terminal, flat washer, and spring washer on the M6 welded
stud, and tighten the nut to a torque of 5 N.m using a socket wrench.
To enhance the anti-corrosion performance of the ground terminals, apply silica gel on them after connecting the
ground cable.
End
Figure4-1 Shows the flowchart for connecting cables to the Sofar 30~40KTL
Connect PGND Cables
Connect AC Output power
Cables
End
Connect DC Input power
Cables
Connect Communication
Cables
The inverter is transformerless, Requires The positive pole and the negativepole
of the PV array are not grounded, Otherwise it will cause inverter failure, In the
PV power generation system, all non current carrying metal parts(such as:
Bracket, Junction box shell, inverter shell) should be connected to earth.
Attention
Figure4-2 Ground terminal composition
1
M5 welded stud
2
OT Terminal
3
M5 Antiskid nut
.
.
.
Note:
Figure4-4 Preparing a ground cable (2)
Figure4-3 Preparing a ground cable (1)
All rights reserved
Shenzhen SOFARSOLAR Co ., Ltd.
C
25
All rights reserved
Shenzhen SOFARSOLAR Co ., Ltd.
C
26
User manual
User manual
Electrical Connections
Electrical Connections
WIFI
RELAY
RS485IN RS485OUT
IN 2
IN 1
AC
OFF
ON
Sofar 30K~40KTL
Sofar 30K~40KTL
Document Version 1.0(2015.08.06)
Document Version 1.0(2015.08.06)
Компания
«
Реалсолар
»,
Санкт
-
Петербург
,
Октябрьская
наб
.,
д
. 104,
к
. 1,
лит
.
П
www.realsolar.ru +7911-921-52-96
