Maintenance And Care; Visual Inspection; Cleaning - JinkoSolar JKM PP-60 Series Installation Manual

i) It is recommend to use negatively grounded inverters to avoid the PID effect for non-PID free
modules.
j) If modules are connected in series, the total voltage is equal to the sum of individual voltages. The
recommended as below,
System voltage≥N*Voc[1+TCVoc* (Tmin-25)]
Where
N module numbers in series
Voc Open circuit voltage (refer to product label or data sheet)
TCVoc Temperature coefficient of open circuit voltage (refer to product label or data sheet)
Tmin Minimum ambient temperature

4. Maintenance and Care

It is required to perform regular inspection and maintenance of the modules, especially during the
warranty period. To ensure optimum module performance, Jinko recommends the following maintenance
measures:

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
back sheet. Check the back sheet for damage.
f) Check whether the back sheet 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.
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