Canadian Solar CS3U-MB-FG Installation Manual page 28

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· Use a proper cleaning solution and suitable cleaning
equipment.
· Do not use abrasive or electric cleaners on the module.
· Particular attention should be taken to avoid the module
backsheet or frame to come in contact with sharp objects,
as scratches may directly affect product safety.
· Do not use de-greasers on the module.
· Do not use cleaning corrosive solutions containing acid,
alkali, acetone, or industrial alcohol.
· Canadian Solar Inc. recommends to avoid rotating brush
cleaning methods, as they could create micro-cracks in the
PV modules.
· Dirt must never be scraped or rubbed away when dry, as
this will cause micro-scratches on the glass surface.
OPERATION PREPARATION
· Noticeable dirt must be rubbed away by gentle cleaning
implement (soft cloth, sponge or brush with soft bristles).
· Ensure that brushes or agitating tools are not abrasive to
glass, EPDM, silicone, aluminum, or steel.
· Conduct the cleaning activities avoiding the hottest hours
of the day, in order to avoid thermal stress on the module.
We recommend the following to be used:
· Water with low mineral content
· Near neutral pH water
· The maximum water pressure recommended is 4 MPa (40
bar)
CLEANING METHODS
Method A: Compressed Air
Canadian Solar Inc. recommends cleaning the soft dirt (like
dust) on modules just with air pressure. This technique can
be applied as long as the method is efficient enough consi-
dering the existing conditions.
Method B: Wet cleaning
If excessive soiling is present on the module surface, a
non-conductive brush, sponge, or other mild agitating me-
thod may be used with caution.
· Ensure that any brushes or agitating tools are constructed
EN-Rev IM/GN-BM-EU/1.21 Copyright © July 2019. Canadian Solar Inc.
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 environmental friendly cleaning
agent may be used with caution.