东方日升新能源股份有限公司
PV module installation and
maintenance manual
RISEN ENERGY CO.,LTD.
主导部门：组件研发中心
Page：NO.34 ,Total 41
the nameplate or datasheet of the module.
The maximum number of modules in series depends on the system design, the type
of converter used and the environmental conditions. In general, the maximum
number (N) of PV modules in series can be calculated by dividing the maximum
system voltage by the open circuit voltage of the relevant solar PV modules. When
designing the solar PV system, it is necessary to take into account the
characteristic that the voltage of the solar PV module changes with the temperature.
Considering the voltage increase caused by temperature drop in extreme
environment in winter, the maximum series connection number of solar PV modules
can be calculated by the following formula.
Table 10-1 maximum series connection number calculation
Formula
Maximum system voltage V ≥ N x V
oc
x [1+βx (T
min
-25)]
V
Maximum system voltage
N
The number of maximum solar PV modules in series
V
oc
The open circuit voltage of each module (see product label or data sheet)
β
Temperature coefficient of open circuit voltage of the module (refer to data
sheet)
T
min
The lowest ambient temperature at installation site
Remarks: if the number of parallel connections is greater than or equal to 2, there must be an
over-current protection device on each string of modules.
Product can be irreparably damaged if an array string is connected in reverse
polarity to another. Always verify the voltage and polarity of each individual string
before making a parallel connection. If you measure a reversed polarity or a
difference of more than 10V between strings then check the string configuration
before making the connection.
Before wiring the module, ensure that the contact points are corrosion resistant,
clean and dry; If a string of modules is reversed, irreparable damage can be caused
For relatively large installations, nison recommends that you use lightning
protection in accordance with local requirements and regulations.
Each Risen solar PV module has two PV cables which can withstand 90
℃
