Last revised: December 2011
4
Devices listed and identified for grounding frames of PV modules are permitted to ground the
exposed metallic frames of the module to grounded mounting structures. Per NEC 250.136,
electrical equipment secured to and in electrical contact with a metal rack or structure
provided for its support and grounded by one of the means indicated in 250.134 shall be
considered effectively grounded.
Mounting
Modules may be mounted at any angle from horizontal to vertical. Select the appropriate
orientation to maximize sunlight exposure.
The gap between the module and system structure or ground is required to prevent wiring
damage and allows air to circulate behind the module.
Make sure that the module installation shall obey local fire-resistant regulations. Do not
remove or alter the module frame. Additional mounting holes may damage the module and
reduce the strength of the frame.
Important
Modules should be mounted using the following methods only:
1.
1.
1.
1.
Screwing
Screwing
Screwing
Screwing:
: :
:
Secure the module to the structure using the factory mounting holes. The torque
wrench must be used for assembly. In the examples shown, the tightening torque must
be 20N
．
m. Use the existing holes for securing the module; do not drill any additional
holes (doing so would void the warranty). Use corrosion-proof fastening materials.
For PM220P00 and PM240P00 modules, four stainless steel bolts, with nuts, washers,
and lock washers are recommended per module. Only the existing mounting holes
(Diameter: 9mm) that can be used for module to meet 5400Pa design strength under
IEC 61215/IEC 61730 and to meet 2400Pa design strength under UL 1703.
2.
2.
2.
2.
Clamping
Clamping
Clamping
Clamping:
Note that
Note that
Note that
Note that the
the
the
the clamping
clamping
clamping
clamping clips on the
clips on the
clips on the
clips on the side
side
side
side frame
frame
frame
frame should be in parallel
should be in parallel
should be in parallel
should be in parallel
. Here are 2 clamping
methods.
Clamping on longer side frame: The side frames are attached to the longer sides of
the module. Figure 3 shows effective mounting area.
The centerline of the clips should be between D1-375mm~D2-460mm from the
short end of the module for 5400 Pa design strength under IEC 61215/IEC 61730
and for 2400Pa design strength under UL 1703.
Clamping on shorter side frame: The side frames are attached to the shorter
sides of the module. Figure 4 shows effective mounting area.
The centerline of the clips should be between D3-50mm~D4-150mm from the
long end of the module for 2400 Pa design strength under IEC 61215/IEC 61730.
Installers should ensure the clamps are of sufficient strength to allow for the
maximum design pressure of the module. Clips and clamps are not provided by
