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The glass can protect the module, improper operation may cause the glass to be broken. Damaged module pose
a risk of electric shock and fire. Such modules cannot be repaired or repaired and should be replaced immediately.
When sunlight strikes the front of the module, the module generates electricity and the DC voltage may exceed
30V. Avoid direct contact with the voltage of 30V or higher to avoid danger.
To reduce or avoid the array mismatch effect, it is recommended to connect modules with similar electrical
properties on the same string.
When connecting modules, ensure that the connecting cables are fixed on the support frame of the module to
limit the swing of the slack part of the cable.
Comply with the minimum bending radius of the cable (not less than 43mm is recommended).
3 Electrical Properties
Electrical installation
The module product specification lists the specific electrical performance of photovoltaic modules in detail, and
the nameplate of each module is also marked with the main electrical performance parameters under STC conditions
(1000W/㎡, AM 1.5, cell temperature 25°C). The product specification and nameplate are also marked with the
maximum system voltage of the module.
Under certain environmental conditions, the current or voltage generated by the module may be greater than
the operating current or voltage for standard test conditions (STC). Therefore, when determining the current/voltage
ratings and load values of electrical components, the module short-circuit current under STC should be multiplied by
1.25, and the open-circuit voltage should be corrected according to the calculation formula below:
Maximum System Voltage
While,
N — Serial number of modules in strings
V
— Open circuit voltage value of module under STC (see module nameplate)
oc
λ
— Open circuit voltage temperature coefficient of the module (see module technical specification)
voc
T
— Annual minimum temperature for module installation position (for example, -20 ° C, T
min
When determining the appropriate wire and fuse specifications, the maximum fuse current rating is selected by
reference to the product specifications.
The system electrical design and calculation shall be determined by a qualified electrical engineer.
The minimum over-current protection device specification is determined by calculating the maximum expected
current of the photovoltaic system. The maximum over-current protection device specification is mandatory in IEC
61215:2016 and IEC61730:2016 standards.
≥
＋
（
N×Voc×[1
λ
voc
T
-25
℃）
min
= -20)
min
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