28
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.
8.2 Module Appearance Inspection
Check module cosmetic defects with naked eyes , especially:
◆
Module glass cracks.
◆
Corrosion at welding parts of the cell main grid (caused by moisture into the module due to damage of sealing
materials during installation or transportation).
◆
Check whether there are traces of burning mark on the module back sheet.
◆
Check PV modules if any signs of aging including rodent damage, climate aging, connectors tightness, corrosion
and grounding condition.
◆
Check if any sharp objects in contact with PV modules’ surface
◆
Check if any obstacles shading the PV modules
◆
Check if any loose or damage screws between the modules and mounting system. If so, adjust and fix in time.
8.3 Inspection of Connectors
and Cables
It is suggested to carry out the following preventive
inspection twice a year:
◆
Check the tightness of the connectors and cables.
◆
Check if any crack or gap of silicone nearby the
junction box.
9 Release and execution
This manual is implemented and managed by product management department of LONGi, who reserves the right to
modify and revise this manual in any time without prior notice.
