BYD COMPANY LIMITED
Rev. 21.12 2018
Document
Installation Manual and User Manual for BYD
Project No.
\
Code
2M SOP0007540
Edition
13
Page
20 / 30
20
4.2 Module Cleaning
Excess dirt and dust accumulating on the glass surface of the
module can reduce its power output. Therefore BYD recommends
periodic cleaning of PV modules especially during times when the
modules do not have the expected power output. The cleaning process
must be implemented after the PV modules are disconnected and
cooled, and after cleaning PV modules must ensure dry ,next it are
connected. Non-professional authorized personnel are not allowed to
clean modules, and make sure they have appropriate safety equipment
for aerial work and the risk consciousness of high altitude work. Please
check the glass surface of the module for cracks and damages before
cleaning. If there are already cracks on the module, please do not clean
but inform the installer or maintenance service provider. Do not wear
metal accessories like a watch or jewelry during cleaning PV modules,
avoid the broken of modules.
4.2.1 Module Cleaning Condition
The cleaning works of PV module should be carried out at morning,
evening, overcast sky or irradiance less than 200W/m
2
. The use of cold
water to clean a PV module heated up sunshine might cause cracks in
the glass cover of the module, so strictly forbidden proceed cleaning
work during the noon or a strong period of sunlight.
4.2.2 Module Cleaning Method
Module cleaning method divided into general clean and washing
clean.
1.
General Clean
(1) To the attachment which can easy to clean like dry dust, leaves
on the PV module surface, cleaner can use dry and professional mop or
soft cloth to clean.
(2) To the attachment which are not easy to clean like mud, birds
droppings, sticky stuff on the PV module surface, cleaner can use
scraper or gauze to wipe, but avoid using hard material, to prevent
destroy glass surface. Use cleaning effect to judge whether clean or
not.
2. Washing Clean
(1) To the inorganic compound like wet dust which are not easy to
clean on the PV modules surface, cleaner can carry out general clean
(2) first, then use clean water which pressure less than 500KPa to
washing, finally, use clean gauze wipe the waterlogging. To avoid cell
micro crack or module broken, cleaner must attention the water
pressure should not too large.
(2) To the organic like animal corpse (such as mosquitoes and
flies), dung or plant sap which are closely attach to the glass surface,
cleaner can carry out general clean (2) first, then use clean water which
pressure less than 5MPa to washing meanwhile match up professional
cleaner like soft soap water or neutral disinfectant (such like alcohol,
