DMEGC Photovoltaic Modules Installation Manual
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DMEGC modules are supplied with connectors used for system electrical connections. We strongly
recommends using the genuine connector type specified by DMEGC's product data sheet. Any choice
of a different connector type other than specified may void the warranty of the module.
To ensure reliable electric connection and to prevent possible intrusion of humidity, two connectors
must be mated and locked together until a click can be heard.
Long-term exposure to wet environments may cause connectors' poor connectivity, resulting in current
leakage and poor conductivity which voids the warranty. DMEGC recommends proper
connector/cable/wire management to prevent moisture intrusion. Depending on the amount of
humidity, DMEGC recommends periodic inspections of the installation system to maintain optimal
module performance.
The DC current generated by photovoltaic systems can be converted into AC and fed into a public
Grid. As local utilities’ policies on connecting renewable energy systems to the Grids vary from region
to region. Always seek the advice from a qualified system designer or integrator. Building permits,
inspections and approvals by the local utility are generally required.
Especially for larger installations DMEGC recommends lightning protection following the local
requirements and regulations.
6. Grounding
For grounding and bonding requirements, please refer to regional and national safety and electricity
standards. If grounding is required, use a recommended connector type for the grounding wire.
DMEGC PV Modules use an anodic oxidized aluminum frame to resist corrosion, so the frame of
Modules should be connected to the equipment grounding conductor to prevent thunder and electrical
shock.
The frame rails have pre-drilled holes marked with a grounding sign, these holes should be used for
grounding purposes and should not be used for mounting the Modules.
We recommends always refer to local state and national code requirements for PV module grounding.
DMEGC highly recommends negative grounding if it's allowed by local authorities.
When attaching the frame grounding hardware and wire to the frame it must be placed corresponding
to the ground symbol stamped location to ensure proper electrical connection.
DMEGC recommends one of the following parts for grounding:
1) Use M8 bolt and washer to bond the ground wire and aluminum frame through the grounding hole
(as shown below left). The tightening torque is 3-7Nm. All nuts and washers should be made of stainless
steel. 4-14 mm
2
(AWG 6-12) exposed copper wire is recommended as ground wire.