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SOLUXTEC USER GUIDE 2021_Version 1/a_ALL RIGHTS RESERVED
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In parallel:
total intensity is the sum of the serial lines in
parallel (in parallel we add the intensities)
total voltage is the sum of each module voltage in
from 1 line (in parallel we do not add the voltage)
Note: When a project is wired with modules in parallel, it is important to check the fuse rating
of the module. This value is available on the module’s label as well as on the dedicated data
sheet. Indeed, in case of 1 line shadowing, the line that is still producing energy will “load” the
other. This is why an appropriate line fuse protection must be applied and follow appropriate
standards.
The maximal overall voltage of a PV generator needs to take into consideration the
worst-case scenario. It means that we need to consider the voltage open circuit and
the minimal temperature on site.
You can calculate it with the following formula:
𝑀𝑀𝑀𝑀𝑀𝑀
𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠
𝑣𝑣𝑣𝑣𝑣𝑣𝑠𝑠𝑀𝑀𝑣𝑣𝑠𝑠
=
𝑁𝑁
𝑀𝑀
𝑈𝑈𝑣𝑣𝑈𝑈
[1 +
𝑇𝑇𝑈𝑈𝑈𝑈𝑣𝑣𝑈𝑈
𝑀𝑀
(
𝑇𝑇𝑠𝑠𝑇𝑇𝑇𝑇 −
25°)]
Where:
N=number of modules in serial
Uoc = Open circuit voltage of a module
TcUoc = Temperature coefficient at open circuit voltage
Tmin = Minimal temperature on project site
The cables section from our products is always given at 4mm², cables are always UV
resistant and qualified for direct current (DC). This section is enough for a single
component. However, and depending on the configuration of the pv generator, it is
recommended to check at the maximal short circuit current from the whole project in
order to elect the right cables cross section in respect to the local standards.
The planning for the wiring of the PV system should consider a tight loop wiring of the
plus and minus line. The area enclosed by the conductors should be kept as small as
possible (here in grey). This reduces the risk of inductive coupling caused by lightning
strokes.
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