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2-3-2. Mounting using the "Clipping method"

"The clipping method" is a way to secure modules on steady 
base profiles (rail structures. etc.,) with "clipping" materials to 
hold the top of the frame, without directly securing it with bolts 
and nuts on the back of the module.
Mitsubishi Electric Corp.
doesn't specify or
warrant any materials,
e.g. base profile and
clipping materials etc.,
related to the clipping
method.

• The base profile should be perpendicular to the longer side 

of the module (see figure below).

• 

The module shall be attached at 4 points or more on the frames.

• 

Refer to the figure for the proper attachment.

• Secure the clips using M6 (1/4”) or larger (M8 (5/16”)) bolts 

for where heavy snow loads are expected.

• Make to use clips that reach at least 5mm in from the edge 

of the module frame.

• Use clipping material with sufficient strength and proper 

form that can withstand forces from wind pressure and 
snowfall pressure specific to the local climate.

• Secure bolts with the appropriate torque to avoid 

deformation of the module frame.

• Take precaution in utilizing locking fasteners to avoid 

loosening of the panel from its original anchored position.

• Note that the drainage holes at each corner of module 

should not be blocked by the base profile.

En-2

En-3

2-3. MOUNTING

• Use mounting framework that can withstand forces from wind 

pressure and snowfall pressure specific to your local climate.

• Use mounting framework and brackets that can withstand the 

environment where the PV modules are to be used. Select 

proper corrosion resistant materials and coatings.

• Use appropriate safeguards and components to install the 

modules. 

• PV modules shall be mounted over a fire resistant roof 

covering rated for the application and on any slope less than 

5in/ft (127mm/305mm) to maintain a fire Class rating.

• Installing the modules at an angle less than 2°can result in 

decreased module output due to dirt and dust accumulating 
on the module surface.

• Make sure there is enough space for air circulation behind 

the PV modules to dissipate heat.

• DO NOT open any additional holes in the modules.
• The module is Type 2 of Fire Performance.

2-3-1. Mounting using bolt holes

Mounting examples:

• Fasten the corner holes of the PV module with M8 (5/16”) 

stainless steel bolts to the mounting framework with a 

torque of 4.5 to 6N·m (3.3 to 4.4 ft-lb). 

• Use spring washers and flat washers to fasten the PV module as 

shown in figure1. 

• Install the PV module securely 

by fastening the appropriate 
bolts with double nuts and 
locking washers.

• Make sure that there is more 

than a 5 mm gap between 

modules to prevent buckling 
caused by thermal expansion.

CAUTION

WARNING

2.INSTALLATION

Refer to Local Code (US: National Electrical Code) standards, 

construction rules and safety instructions regarding installation 
of the PV modules.
Electrical installations in Canada shall be in accordance with 

CSA. C22. 1, Safety Standard for Electrical Installations, 
Canadian Electrical Code, Part1.

2-1. CLIMATE CONDITIONS

Install the PV module within the following conditions:

• Ambient monthly mean temperature: -20°C to 40°C (-4 to 104 °F)
• Operating temperature: -30°C to 83°C (-22 to 181 °F)
• Allowable pressure: up to +2400/-3000Pa 
• Water resistance/damage: The PV modules shall not be 

immersed in water and shall not be continually exposed to 
a source of water, such as a sprinkler, fountain, etc.

• Corrosion warning: The PV modules shall not be installed in 

corrosive areas such as:

-- Salty areas: areas where salty water such as ocean 

spray comes in direct contact with the module, or

-- Sulfurous areas: areas near sulfurous volcanos and 

sulfurous springs.

Note

In case of installation in Asian countries, PV modules shall 
not be installed in corrosive areas within 500m from a body 
of salt water and/or areas where there is direct contact with 

salty wind.

2-2. ORIENTATION

• Install the PV modules facing South in the Northern 

Hemisphere or North in the Southern Hemisphere.

• PV modules connected in series should be installed in the 

same orientation and angle. Different orientation or angles 

may cause loss of output power due to the different 
amount of sunlight being absorbed by the modules.

• Do not allow the modules to be shaded at anytime.

Shade causes loss of electrical output, even though the 

factory fitted bypass diode will reduce such loss to some 
extent.

1-2. MULTIPLYING FACTOR

Under normal conditions, the PV module is likely to experience conditions that produce more current and/or voltage than reported

 

under Standard Test Conditions. Accordingly, the values of Isc 

and Voc marked on this module should be multiplied by a factor of 

1.25 when determining component voltage ratings, conductor

 

capacities (cross sectional area), fuse sizes, and size of controls

 

connected to the PV output. Customers in US should refer to article 690.8 the National Electrical Code for an additional 

multiplying 

factor of 125 percent (80 percent derating), which may 

be applicable. Customers in other locations should refer to the codes relevant to 

the location of installation for further guidance. Voc should be increased by a factor based on the lowest ambient temperature 

recorded for the location. To determine the corrected value for Maximum System Voltage follow the guidelines in article 690.7 of the 
NEC or applicable section in the CEC. The voltage temperature coefficient for the module in use should be used when determining 
Maximum System Voltage.

1-1. STRUCTURE

CAUTION

5mm min.

Frame (longer side)

bolt

Clipping material

Framework (base profile)

Module

(in principle)

Fig. 1 Module mounting

Fig. 5 Grounding method #3

2-4-1. Method #1 (use of self-tapping screws)

• Install a stainless steel screw (M5 or No.10) with 32 threads 

per inch to the grounding hole with a torque of 2.3N·m 
(20lbf-in).

• Ensure that at least 2 threads are engaged in the module 

frame.

• As shown in the figure 3, the copper wire should be 

compressed by the screw head.

• A stainless steel washer with an appropriate corrosion 

resistant coating should be inserted between the copper 
wire and screwhead.

• A proper cupped washer should be inserted between the 

copper wire and frame to avoid galvanic corrosion.

• The copper wire must be #14 AWG or thicker, and be 

secured to the module frame.

Fig. 3 Grounding method #1

2-4-2. Method #2 (use of a ground lug)

• An appropriate device such as UL Listed ILSCO ground lug, 

Cat. No. GBL4-DBT should be secured by a stainless steel 
screw (M5 or No.10) with 32 threads per inch with a torque 
of 2.3N·m (20lbf-in) as shown in the figure 4.

• A star or toothed washer shall be inserted between the 

ground lug and module frame.

• The copper wire must be #14 AWG or thicker, and be 

secured to the ground lug screw.

Fig. 4 Grounding method #2

2-4-3. Method #3 (use of bolts and nuts)

• A No.8 stainless steel bolt and nut with 32 threads per inch 

can be used instead of a No.10 self-tapping screw in 
Method #2 under the following conditions:

- Torque to secure the bolt: 1.8N·m (16lb-in)
- A lock or spring washer shall be inserted between the 

nut and toothed washer.

Fig. 2 Clipping method

Required mounting area to be fixed

2-4. GROUNDING

• The grounding method should satisfy the Local Codes and 

the NEC or CEC accordingly.

• Securely ground the PV modules and the mounting 

framework.

Examples of proper grounding technique:

WARNING

2 Nuts

(Stainless steel, 5/16(M8))

Spring washer

(Stainless steel, 5/16)

Flat Washer

(Stainless steel, 5/16)

Mounting structure

(Alminium)

Flat Washer

(Stainless steel, 5/16)

Bolt

(Stainless steel, 5/16(M8))

Stainless steel washer
(#10) 

Self-tapping screw
(Stainless steel, #10-32TPI)

Cupped washer

Copper wire (14AWG or thicker)

Module frame

(Stainless steel)

Copper wire

(14AWG or thicker)

(Stainless steel)

Stainless steel washer(#10) 

Cupped washer

Module frame

Self-tapping screw

(Stainless steel, #10-32TPI)

Self-tapping screw
(Stainless steel, #10-32TPI)

Copper wire

(14AWG or thicker)

Toothed washer

(Stainless steel, #10)

Grounding lug
(ex. ILSCO GBL4-DBT)

Copper wire

(14AWG or thicker)

Grounding lug

(ex. ILSCO GBL4-DBT)

Self-tapping screw

(Stainless steel, #10-32TPI)

Toothed washer

(Stainless steel, #10)

Bolt
(Stainless steel, #8)

Nut (Stainless steel, #8)

Grounding lug
(ex. ILSCO GBL4-DBT)

Spring washer
(Stainless steel, #8)

Copper wire

(14AWG or thicker)

Toothed washer

(Stainless steel, #8)

E(4 PLACES)

Drainage holes

15[0.59]

20[0.79]

6[0.24]

35[1.38]

1657[65.2]

1000[39.4]
1200[47.2]

1199[47.2]

994[39.1]

46[1.81]

A A

B
B

C

φ

4.09[

φ

0.16](4 PLACES)

6[0.24]

×

20[0.79](4 PLACES)

φ

4.09[

φ

0.16](4 PLACES)

φ

9[

φ

0.35](4 PLACES)

D

E

(+

)

(–

)

Mounting area (4 places)

Framework (base profile)

up to +2400/-3000Pa

up to +2000/-2400Pa

up to +2000/-2000Pa

1657 (65.2)

594 (23.4)

994 (39.1)

600 (23.6)
900 (35.4)

1400 (55.1)

φ

9[

φ

0.35]

21.5[0.85]

30[1.18]

46[1.81]

φ

4.09

[

φ

0.16]

D(4 PLACES)

φ

4.09

[

φ

0.16]

Grounding Mark

25.3[1.00]

Grounding Mark

25.3[1.00]

C(4 PLACES)

A−A

B−B

24.5[0.96]

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