Mechanical installation
Selection of modules
For detailed electrical data, please refer to the current
product data sheet.
Available at www.energetica-pv.com.
Only interconnect modules of the same type and the same
performance class to prevent damage to the modules.
Safety factors
During normal operation it is possible that modules
deliver a higher current and / or higher voltage than under
standardized test conditions:
»
When determining the current ratings (ISC) of conductors
and
»
When dimensioning controls that are connected to the
outputs of the solar modules
»
When determining the rated voltage values (VOC) of
components.
The applicable national regulations for the installation of
electrical systems must be followed.
Series connection
Series connection of the modules is only permitted up to the
maximum system voltage specified in the applicable data
sheet.
»
The design must take into account all operating
cases, temperatures and relevant technical regulations
and standards.
This ensures that the maximum system voltage, including
the required safety margins, is not exceeded.
»
When designing the string length: Take into account the
voltage limitation of the inverter when determining the
number of modules.
Series connection
In case it is necessary to connect module strings in parallel in
addition to the series connection, undesired reverse currents
can occur.
In the case of reverse currents, not only modules can be
damaged (caused by module defects, earth faults or insulation
faults) but also personal injury and property damage.
IMPORTANT SAFETY INFORMATION !!
If the module strings are connected in parallel, external
diodes (blocking diodes adapted to the output) are requi-
red because the internal electronics adapted to the modle
output cannot regulate the current flow, when individual
module strings are shaded in the parallel connection.
Failure to observe this can damage the solar modules and
internal electronics, resulting in personal injury and proper-
ty damage.
Ensure compliance with the maximum reverse current load
specified in the data sheet !
In order to limit or prevent the reverse currents that occur,
we recommend the following technical solutions:
Series connection
1) Design with a limited number of parallel-connected
strings:
»
To limit the current, a maximum of two module strings
can be operated in parallel on an inverter or an MPP
tracker.
»
If more than two strings are operated in parallel on an
MPP tracker or an inverter input, the use of blocking
diodes adapted to the power to protect against reverse
currents is mandatory.
2) Design with string protection:
»
Secure modules per string on the plus and minus side.
Use gPV fuses in accordance with IEC 60269-6. Observe
the number of strings permitted in accordance with the
specifications of the respective string fuse manufacturer
and the technical guidelines.
IMPORTANT SAFETY INFORMATION !!
If the inverter does not have integrated reverse current
protection, this must be provided externally in form of a
blocking diode in the individual DC strings.
NOTE! When installing different product revisions, the
minimum permissible reverse current load applies.
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