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4.1 Visual Inspection
Inspect the modules visually to find if there are any visual defects, If there are, the following
items should be evaluated:
a) If modules are observed having slight cell color differences at different angles, this is a
normal phenomenon of modules with anti-reflection coating technology.
b) Whether the glass is broken;
c) No sharp objects are in contact with the PV module surfaces
d) PV modules are not shaded by unwanted obstacles and; or foreign material
e)
Corrosion along the cells’ bus-bar. The corrosion is caused by moisture intrusion thought
the module rear cover. Check the rear cover for damage.
f) Check whether the rear cover is burn out.
g) Check if screws and mounting brackets are tight, adjust and tighten as necessary.
4.2 Cleaning
a) A build up of dust or dirt on the module(s) front face will result in a decreased energy output.
Clean the panel(s) preferably once per annum if possible (depend on site conditions) using
a soft cloth dry or damp, as necessary. Water with high mineral content may leave deposits
on the glass surface and is not recommended.
It is recommended to use neutral water to
clean the glass to avoid strong acid and alkali, so as not to cause damage to the glass
coating layer.
b) Never use abrasive material under any circumstances.
c) In order to reduce the potential for electrical and thermal shock, Jinko recommends cleaning
PV modules during early morning or late afternoon hours when solar radiation is low and
the modules are cooler, especially in regions with hotter temperatures.
d) Never attempt to clean a PV module with broken glass or other signs of exposed wiring, as
this presents a shock hazard.
e) Never use chemicals when cleaning modules as this may affect the module warranty and
energy output.
4.3 Inspection of Connector and Cable
It’s recommended to implement the following preventive maintenance every 6 months:
a) Check the sealing gels of the junction box for any damage.
b) Examine the PV module(s) for signs of deterioration. Check all wiring for possible rodent
damage, weathering and that all connections are tight and corrosion free. Check electrical
