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8
Operation and maintenance
Figure 11 Clamp Grounding Method
Note: TYCO. 1954381-1 (Recommended) is used in figures above.
Figure 12 Bolt Grounding Method
Grounding clamp
Slot
Grounding
Push
Mounting
Fasten base bolts and keep
base and frame parallel
Grounding line is at bottom
of line slot
Cover the base and the line
is clamped tight.
Grounding Wire
Grounding
Wire
Frame
Frame
Fasten nuts
Tooth washer
Fixing end of
grounding clamp
Grounding bolt
Grounding wire fastening bolt
3 The third party grounding devices
The third party grounding device can be used for grounding of LONGi modules but such grounding method shall be
proved to be reliable. Grounding device shall be operated in line with stipulations of the manufacturer.
It is the users’ responsibility to carry out regular inspection and maintenance for modules, especially during the period of
limited warranty. To inform the LONGi customer service personnel within two weeks when modules are found broken or
other significant abnormality.
8.1 Cleaning
Accumulated contaminants on module surface glass will reduce the power
output and lead to local hot spot, such as dust, industrial wasted water and
birds’ droppings. The severity of influence is determined by transparency of
wastes. Small amounts of dust will affect the intensity and evenness of received
solar irradiation but are not dangerous and power will not be reduced remark-
ably generally.
During operation of modules, there shall be no environmental factors to shade modules fully or partially. These environ-
ment factors including other modules, module mounting system, birds dwelling, dust, soil or plants. These will significant-
ly reduce output power. LONGi suggests that the module surface should not be shadowed in any case.
Frequency of cleaning depends on dirt accumulation speed. In normal situations, rainwater will clean the module surface
and reduce the cleaning frequency. It is suggested to use sponge dipped with clean water or soft cloth to wipe the glass
surface. Do not use acid and alkaline detergents to clean modules. Do not use tool with rough surface to clean in any
case.
In order to avoid potential risk of electrical shock or burn, LONGi suggests cleaning the modules during early morning or
evening with low irradiance and low modules temperature especially for the hot regions.
In order to avoid potential risk of electrical shock, do not try to clean the modules with glass damage or expose wires.
