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modules. This technique can be applied as long as the method is efficient
enough to clean the modules considering the on-site conditions.
Method C: Wet cleaning
If excessive soiling is present on the module surface, a non-conductive brush,
sponge, or other mild agitating method may be used with caution.
Please make sure that any brushes or agitating tools are constructed with non-
conductive materials to minimize risk of electric shock and that they are not
abrasive to the glass or the aluminum frame.
If grease is present, an environmentally friendly cleaning agent may be used
with caution.
Method D: Cleaning robot
If a cleaning robot is used for dry cleaning, the brush material is required to be
soft plastic material, and the glass surface and aluminum alloy frame of the
module will not be scratched during the cleaning process and after cleaning.
The weight of the cleaning robot should not to be too large. If the cleaning
robot is improperly used, and the resulting module damage and power
attenuation are not covered by ET Solar’s warranty.
TROUBLE SHOOTING
If your PV system does not work normally after installation, please inform your
installer immediately. It is recommended to perform preventive inspections
every six months, and do not change the components of the modules without
authorization. If electrical or mechanical performance inspection or
maintenance is required, they should be operated by qualified professionals to
avoid any electric shock or personal injury.
6.2 The visual inspection of the modules
Inspect the modules visually to find if there are appearance defects, especially:
whether the module glass is broken.
If there is burning vestige on the backsheet.
Corrosion along the cells’ bus-bar. The corrosion is caused by the dampness
infiltrated into the modules when the surface encapsulation material is
damaged during the installation or transportation.
Check if any obstacles shading the PV modules
6.3 Inspection of the connector and cable
It is suggested to carry out the following preventive inspection every 6 months.
Check the encapsulation of the connector with the cable
Check the sealing gel of the junction box to ensure it is not cracked or creviced.
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Disclaimer of liability
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