4 Ver. 0.2
system. Have your installer perform the necessary steps to bring the PV system back into a safe
condition.
Mechanical Installation
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The design and installation of photovoltaic systems shall be in accordance with the National Electrical
Code (NEC), the Canadian Electrical Code (CEC) and the national regulation of the country where the
modules will be installed.
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To install the modules in proper direction such as facing south in northern latitudes and north in
southern latitudes for best power output.
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Please note that any shadows cast by the modules do not fall on other modules behind them. This can
have adverse effects on overall system performance or may result in permanent damage to modules.
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Do not modify the PV module frames mechanically or chemically. It will void the warranty.
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Clearance between the module frame and mounting surface may be required to allow the cool
ambient air circulating behind the module. It is necessary for optimum module performance.
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All fasteners (nuts, bolts, washers, screws, etc.) must be stainless steel made unless otherwise
specified (it should use corrosion-proof fixing material).
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The module mounting structure must be made of durable, corrosion-resistant and UV-resistant
material.
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There are two approved methods to mount NSP modules to the supporting structure. For all mounting
methods, a minimum gap between the modules of 5 mm is required to allow for thermal expansion.
Method (1) : Attachment Using Screw
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Each long side frame has 4 mounting slots with dimension of 9 x 14 mm used to secure the module to
supporting structure, as shown in Fig. 1.1.
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For normal installation, modules must be securely fastened to the mounting structure using at least 4
symmetrical mounting slots for normal installation as shown in Figure 1.2. If additional wind or snow
loads are anticipated for this installation (≤ 5400 Pa), additional mounting slots are also needed as
shown in Fig. 1.3.
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The module frame must be fastened to supporting structure using M8 stainless steel hardware
together with spring washers and flat washers (all fitting components must be corrosion-proof
material) as shown in Fig. 1.4.
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The applied torque is about 8 N-m.
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Here the standoff method or the rack method is recommended. The recommended stand-off height is
140 mm as shown in Fig. 1.5.