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3-6 Installing the AC Junction Box and PV Rack
3-7 Mounting the AC module
Before installing the AC junction box and PV rack, be aware of the following requirements:
Before mounting AC module in the PV rack, be aware of the following requirements:
PV Module Specification (conditions of 1000W/m
2
irradiance and 77ºF (25°C) solar cell temperature)
Operation temperature
Maximum operation temperature: +194°F (90°C).
Minimum operation temperature: -40°F (-40°C).
Design strength
LGE solar modules are certified to basic loads of 50lb/ft
2
.
(about 2400 Pa)
Notes
- LG AC module can not be operated in locations of direct contact to salt water or ammonia.
- LG AC module is thin, so it may bend depending on the type of the PV rack.
- Reflection from snow, water or other weatherly variables may increase the output generated in the module.
- Colder temperatures may substantially increase voltage and power.
NOTICE
NOTICE
• To allow ventilation through the backside of the AC module, it is recommended to install the PV rack allowing a
gap of at least 4 inches (100mm) between the back of the module and roof surface.
• Install AC junction box near the AC module.
• Install using the parts approved by the relevant local authority of installation site.
• Select appropriate angle for maximum exposure to sunlight.
Construct the over all frame of the solar system in the following order:
1. Install the PV rack according to the number of modules per array and the dimensions of the AC module. (refer to
Chapter 6. Product Specification)
2. Install the AC junction box near the PV rack. Select the size and type of AC junction box suitable for connection
type according to the output voltage. (Refer to Chapter 3-10. Connecting Array of AC Modules to Distribution
Panel)
• Check that all parts of the product are intact and operational.
• Check that the cable connectors are well fixed.
• It is recommended to install the module at any angle with respect to the horizon, making it easier for dust to be
washed off by rain.
• When installed on a roof, the PV module must be mounted over a fire-resistant roof. The fire resistance of the PV
module is class C according to ANSI/UL790.
• For proper operation, do not remove PV frame or replace with another frame.
• Additional holes on the frame may weaken, the strength of the frame and cause damage.
• To avoid the tensile strain from the thermal expansion, it is recommended to install with a gap of between 0.236
inches (6mm) to 7.087 inches (180mm) between PV frames considering the length of the trunk cable. If gap
exceeds 7.087 inches, use the extension cable.
• Mount LG AC module to PV rack with 8~12N-mtorque.
• For reliable connection, do not place any foreign objects between PV frame and the PV rack.
• When installing modules in areas of heavy snow, special care should be taken to install the modules in a manner
that provides sufficient strength while meeting local code requirements.