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2 Planning
2.4 Electrical layout
Module Selection
For detailed key electrical data, please refer to the actual data
sheet referring to the relevant Module (available at www.qcells.
com).
For maximum energy yields, mismatches of specified elec-
tric current (I
) of more than 5 % should be avoided for all
MPP
modules connected in series.
Safety Factor
For detailed key electrical data, please refer to the actual data
sheet referring to the relevant Module (available at www.qcells.
com).
During normal operation, a module may generate a greater cur-
■
rent and / or higher voltage than that determined under stand-
ardized test conditions. Please use a safety factor of 1.25 for
the following:
Calculating the voltage measurement values (V
Calculating the current measurement values (I
■
Sizing of control systems connected to the outlets of the solar
■
modules
Please follow the valid national guidelines for the installation of
electrical systems.
Series Connection
Connection of modules in series is only permitted up to the maxi-
mum system voltage as listed in the applicable data sheet of all
the relevant modules to be installed.
Take into account all possible operating situations and all
relevant technical norms and regulations when designing the
system. It has to be ensured that the maximum system voltage,
including all necessary safety margins, is not exceeded.
Take the voltage limit of the inverter into account when deter-
mining the maximum number of modules in the string.
INSTALLATION AND OPERATION MANUAL SOLAR MODULES Q.TRON(BLK) M-G2.X
Parallel Connection
Modules may be damaged by the occurrence of reverse currents
(caused by module defects, ground leaks, or defective insulation).
Ensure that the maximum reverse current load capacity indi-
cated in the data sheet is met.
In order to limit reverse currents that may occur, we recommend
using the following safety options:
1) Layout with a limited number of parallel connected strings :
Without undertaking further current blocking measures, a maxi-
mum of two module strings may be operated in parallel on a
single inverter or MPP tracker.
2) Layout with string fuses :
Use overcurrent devices (e.g. fuses) according to the relevant
standards in each string. Use gPV-fuses according to IEC 60269-
6. Observe the maximum permitted number of strings as indi-
) of components
cated in the specifications provided by the respective string fuse
OC
) of conductors
manufacturer and the technical guidelines.
SC
NOTE!
When installing different product versions, the lowest minimum
permitted reverse current load capacity applies.
Inverters
Inverters with or without transformers may be used.
11
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