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8 | Circuitry guidelines
5 Circuitry guidelines
Only identical solar modules of the same type and engi-
ne-power class may be switched. In this process, ensure
that in the course of the serial switching of the modules,
the maximum permissible system voltage is not excee-
ded. In this context, observe the temperature dependen-
cy of the module voltage for the solar modules, particu-
larly since the module voltage rises when low tempera-
tures prevail.
For the parallel switching of the modules, it must be
ensured that always the same number of modules is
serially switched to the stands to be switched parallel to
these, and that suitable measures for surge protection
Bosch Solar Module c-Si M 48 EU I Bosch Solar Module c-Si M 60 EU I Bosch Solar Module c-Si M 60 S EU I Bosch Solar Module c-Si P 60 EU Bosch Solar Energy AG
are taken (e. g. strand fuse). It must be ensured that the
specified load capacity with regard to the reverse current
IR (17 A at c-Si M 60 and c-Si M 48, 16 A at c-Si P 60 and
c-Si P 48) is not exceeded.
Under standard conditions, a PV module can provide
higher current and/or higher voltage than was specified
under normed test conditions. To determine the voltage-
rating values of structural components, the currentrating
values of cables, the sizes of fuses and the rating of
controls connected to the output of PV modules, the Isc
und Uoc values indicated on the module should therefore
be multiplied by a safety factor of 1.25.
No more than two module strands can be switched
parallel without a sufficiently-dimensioned strand fuse.
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