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INSTALLATION AND OPERATION MANUAL FOR CIGS SOLAR MODULES Q-CELLS SE - EUROPE
5.4 ELECTRICAL LAYOUT
YOU CAN FIND THE DETAILED ELECTRICAL PARAMETERS IN THE PRODUCT DATA SHEET.
Only connect modules of the same type and the same power class. This is the only way to
achieve optimal yields.
It may occur during normal operation that the module provides a greater current and / or a higher
voltage than that determined under standardized test conditions.
Apply a safety factor of 1,25 for Isc and Voc for::
• the identification of the rated voltage value of the used system components,
• the identification of the rated power value of the cables,
• the size of the fuses as well as the design of the controls.
Alternatively, the respectively valid national regulations for the installation of electrical systems
are to be used.
• Only connect modules of the same power class.
• When planning the system design, take into account the relative power increase of U
OC
and
U
MPP
(Addition al Power Boost). This is typ5 % due to positive sorting and 215 kWh/
m² light soaking.
• A series connection of modules is only permitted up to the maximum system voltage speci-
fied in the respective data sheet revision.
• Carry out the layout taking into account all working conditions and relevant technical regu-
lations and standards. In this way you ensure that the maximum system voltage, including
the necessary safety supplements are not exceeded.
• Also take the voltage limitation of the inverter into account when laying out the string length.
Only connect modules of the same type and voltage class.
Do not exceed the maximum permissible reverse current as given in the respective data sheet. In
the event of reverse currents (caused by module defects, ground leakage or shading), modules
can be placed under strain.
In order to safely account for reverse currents, we recommend the following fuse variants:
1) LAYOUT WITH LIMITATION OF THE NUMBER OF PARALLEL CONNECTED STRINGS :
Without further
measures for current limitation, only a maximum of 3 strings of modules may be operated
parallel on an inverter or on a MPP tracker.
2) LAYOUT WITH STRING DIODES :
When more than 3 strings are connected parallel, a maximum
of 3 strings respectively must be protected against reverse currents from the remaining system
with a shared string diode.
3) LAYOUT WITH STRING FUSES :
In this case, each string of modules must be be protected with
4 A on the plus and minus sides.
BEWARE! When installing modules from different product revisions, comply to the minimum
permissible limitation of the product revisions used.
MODULE SELECTION
SAFETY FACTOR
SERIES CONNECTION
REVERSE CURRENT
