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6
MAINTENANCE
6.1 The amount of electricity generated by a solar module is
proportionally correlated with the light absorbed by the module with a
factor equivalent to module conversion efficiency. Cells shaded by leaves
and dust accumulated on the surface will reduce the light absorption and
power generation, and therefore it is important to keep modules unshaded
and clean. To ensure the optimum module performance, PHONO SOLAR
recommends the following:
PV modules can be cleaned only if the solar irradiance is below
Cleaning water or solution with a large temperature difference from the
modules shall not be used for cleaning the modules;
It is forbidden to clean PV modules under the weather
heavy rain, heavy snow or wind grade higher than 4;
If pressurized water is
employed
applied on the glass surface of the module shall not exceed 4MPa
(40bar); the module is prohibited to bear the extra
When cleaning PV modules, do NOT step on the modules; do NOT spay
water on the backside of the module or the cables; keep theconnectors
clean and dry; prevent fire and electrical shock from
use a steam cleaner;
When cleaning the modules, use soft cloth and clean water together
with a mild detergent. The temperature of the water applied shall be
close to that of the module being cleaned.
Use dry or wet soft clean cloth to clean the PV modules; Corrosive
solvents hard
objects
are
strictly prohibited;
If there are greasy dirt and other substances on the surface of the PV
module
which are difficult to clean, conventional household glass cleaning agents
can be used; Do NOT use the alkaline and strong acid solvents.
2
200W/m
;
conditions of
in
cleaning,
the
water
pressure
force;
occurring; do NOT
22
Modules that are mounted flat (0° tilt angle) should be cleaned more
often, as they will not ''self-clean'' as effectively as modules mounted
at a 10° tilt or greater.
The back surface of the module normally does not need to be cleaned,
but in the event this is deemed necessary, avoid the
objects that
might damage or penetrate the substrate material.
Check the electrical and mechanical connections routinely and make
sure they are clean, safe, complete and secure.
In the event of a problem, please consult with a licensed/qualified
person.
6.2 Requirements for Water Quality
PH: 5 ~7;
Chloride and Salinity：0 - 3,000 mg/L
Turbidity：0-30 NTU
Conductivity：1500~3000
µs/cm
Total dissolved solids (TDS)：≤1000
Water Hardness—calcium and magnesium ions：0-40
Non-alkaline water must be used; demineralized water shall be used if the
condition permits.
6.3 Safety Warning
Cleaning work might impose the risk of damaging the a component or a
series of components, and might also increase the risk of electric shock.
Broken or damaged components may present a risk of electric shock due
to current leakage, and this risk may be exacerbated by the moisture in
the components. Before cleaning, ensure to check all wiring for possible
rodent damage, weathering and that all connections are tight and corrosion
free.
Stability / Reliability / Creativity
use of
any
sharp
mg/L
mg/L
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