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P V
M O D U L E
I N S T A L L A T I O N
M A N U A L
4.2 Cleaning
a) Dust or dirt on the modules glass will decrease power output. Clean modules preferably once per year if possible (depend
on site conditions) . Using a so cloth dry or damp are workable. Mineral water is not recommended for cleaning, to any dirt
on glass a er cleaning job.
b) Never use abrasive material to do the clearness under any circumstances.
c) In order to reduce or avoid potential electric shock or burnt, DAH Solar suggest to do the clearness during the earlier
morning or dusk with lower temperature, especially in the areas with high temperature.
d) Do not try to clean the panel which has broken glass or uncovered wires. This may lead to the danger of electric shock.
4.3 Connector & Wires Inspection
It is recommended that the following preventive maintenance be carried out every six months.
a) Inspect the sealant gel to make sure there is no flaw or chink.
b) Inspect whether have aging phenomenon of modules.Includes potential broken caused by the bites of rodent, climate
aging, and all the connectors are connected tighten, have corrosion phenomenon or not. Inspect the grounding connection
in good condition or not.
5. Electrical Installation
Electrical performance parameter of module, such as nominal value of Isc、Voc and Pmas has ±3% random error
compared with value of STC. The standard Testing Environment of module is: Irradiance 1000/m
25°C、Spectrum AM 1.5.
、Cell temperature
2
Normally, the current and voltage of module, will be a little higher compared with the value under STC, so when
confirmed the associated parameters of solar system accessories, such as rated voltage、cable capacity、fuse capacity
and module power, the corresponding short circuit current and open circuit voltage should be amplified by 1.25 times.
Series, parallel circuit electrical diagram
Series Connection
Parallel Connection
Diode
ATS
Connector
The Voc correction factor can be calculated according to the following formula: CVoc=1- βVoc×(25-T), T is The minimum
ambient temperature expected for the installation of the system, β(% /°C) is The temperature coe icient of the selected
module Voc (According to the corresponding Module Data sheet).
If the reverse current which probably exceed the maximum fuses current of module passed through the module, the
modules must be protected by an equivalent current protection device. If the number of parallel is more than or equal to
2 strings, there must be equipped an over current protection device on each series of modules.
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Parallel a er Series
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