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4.3 Overcurrent protection device (OCPD)
When the potential reverse current of a PV string exceeds the rated SoliTek PV module series fuse
rating (values indicated at the module datasheet) an overcurrent protection device (OCPD) must be
used (IEC 61730-1 clause 12.3). An overcurrent protection device is required for each series string if
more than two series are connected in parallel. In this case, it is needed to use one fuse per string
rated at 1.25 x I
sc
or higher (I
sc
is the PV module’s short circuit current at STC). A PV fuse on each PV
string will protect the PV modules and conductors from overcurrent faults and help minimize any
safety hazards. The PV fuse will also isolate the faulted PV string so the balance of the PV system can
continue to generate electricity.
Fuse amp rating ≥ 1.25 x I
sc
Select next higher standard rating at the catalogue of available PV Fuses.
I
sc
= Short-circuit current of one module at Standard Test Conditions (STC);
Considering the values of I
sc
of SoliTek modules, the right value of the PV Fuses to be used at the
installation is 20 A. SoliTek recommends using PV fuses in both the positive and negative conductors.
4.4 Cable & wiring
SoliTek PV modules are provided with two standard, sunlight resistant output cables that are
terminated with PV connectors ready for most installations. The positive (+) terminal has a male
connector while the negative (-) terminal has a female connector. The module wiring is intended for
series connections [i.e. male (+) to female (-) interconnections], but can also be used to connect
suitable third-party electrical devices that may have alternative wiring configurations so long as the
manufacturer’s instructions are followed.
Use field wiring with suitable cross-sectional areas that are approved for use at the maximum short-
circuit current of the PV module. All wiring must be double insulated, cross-linked cables with a
minimum rating of 1,8 kV (over 1500 V voltage) and minimum rated temperature of 90 ˚C. Wire size
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