Installation, operation and maintenance instructions - DualSun XXXM
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60
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3BBP
V1.2
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March 2020
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41
4.1.1
Serial wiring
To connect modules in series, the maximum number of connectable modules is to be determined. For this, it is
necessary to determine the maximum tension of the string. This is calculated by summing the open circuit voltage
(Vco) of each module when the ambient temperature is at its minimum value. Apply the temperature coefficient to
determine the
Vco
value at the temperature considered.
The maximum open circuit voltage of the string must never exceed the maximum system voltage. See module
datasheet.
For modules installed in series, only modules with the same nominal currents will be used.
To determine the number of maximum modules that can be connected in series:
𝑁 =
𝑀𝑎𝑥𝑖𝑚𝑢𝑚 𝑠𝑦𝑠𝑡𝑒𝑚 𝑣𝑜𝑙𝑡𝑎𝑔𝑒
1,15 . 𝑉𝑐𝑜
where:
-
N = maximum number of modules in series
-
Vco = open circuit voltage
of each module, when the ambient temperature is at its minimum value
(refer to the product datasheet in chapter 2.3.2)
If additional PV modules are to be installed in a string with the DualSun modules, their power and
current must be equal to those of the DualSun panels within the tolerances of the manufacturers.
4.1.2
Parallel wiring
For DualSun modules connected in parallel, protection against the corresponding overcurrent must be used. For this
purpose, a DC voltage fuse must be used to prevent reverse current. Refer to the inverse maximum current value of
the product datasheet to determine the value of the protection. In addition, the operating conditions and design rules
of the inverter manufacturer must be met.
Refer to the inverter instructions
The electrical installation must be carried out by qualified personnel in accordance with current safety standards and
IEC/EN 61730.
Refer to the grid operator requirements when installing the system.
The installation must be equipped with a circuit breaker to isolate at the same time all the cables that are not grounded
by a minimum spacing of 3 mm at the contact level.
For modules connected in parallel, only modules with the same nominal voltages will be used.
