7.3.1
When connecting modules, make sure that the connectors of the same series module shall come from the
same manufacturer or totally be compatible with each others, and the same requirements shall go to the
connection terminals of series string and PV system, because the connectors from different manufacturers may
not be compatible with each others, which easily leads to mismatch risk.
7.3.2
Ensure that connector caps are tightened before connecting the modules, keep connectors dry and clean.
Do not attempt to make an electrical connection when the connectors are wet, soiled, or otherwise faulty
conditions. Avoid sunlight exposure and water immersion of the connectors.
7.4 Bypass diodes
The junction box of the Sunerg module contains bypass diode and forms a parallel structure with the solar
cell circuit. When the solar cell sheet is blocked or damaged, a hot spot phenomenon occurs locally in the
module, and the diode will operate so that the current is no longer discharged from the hot spot solar cell flow,
thereby limiting module heat and performance loss. Please note that bypass diodes are not overcurrent
protection devices.
7.5 Grounding
7.5.1
Modules use anodized aluminum alloy frame as a rigid support, in order to avoid modules by lightning
and electrostatic damage, as well as the protection of personal safety, all module frames and mounting racks
must be grounded. If there is no special provision, please follow the International Electrotechnical
Commission standards or other international standards. Use the recommended connection terminals to connect
the grounding cable to the module frame. Use 12 AWG copper wire for the grounding wire. As shown in
Figure 5 on the module ground hole and its label, Figure 6 shows the module grounding method.
Aluminum frame
Grounding hole
Grounding label
Figure 5 Grounding hole and ground label Figure 6 Grounding method
7.5.2
The frames have pre-drilled grounding holes and brand with signs, these holes should be only used for
grounding purposes, but not for mounting the modules. And do not drill any additional grounding holes on the
frames of the module, which may void the warranty.
7.5.3
For optimum power output, it is recommended to ground the DC negative pole of the module array.
7.5.4
The grounding cables must be fully contact with inside of the aluminum alloy, and the connection
terminal must penetrate the oxidation coating of frame during grounding. Connecting the module frames and
supporting beams using suitable grounding conductors can achieve good grounding. If the supporting system is
made of metal, the surface must be electroplated and have excellent conductivity.
7.5.5
The grounding cables must be connected to the earth through a suitable grounding electrode.
Recommend to use the grounding accessories (lugs) to connect the cables. Welding grounding cable to the jack
of lugs, then inserting M4 screws into the ring of the lugs and the grounding holes of module frames, fastening
M4 Nut
Grounding cable
Aluminum frame
Tooth washer
Flat washer
Cup washer
M4 Screw
