LEGAL202107V01
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4.
Electrical installation
4.1.
Electrical property
Module under standard testing conditions of: irradiance of 1000W /m2, cell temperature of 25 °C and air
mass of AM1.5, maximum over-current protection is 15A.
Under normal conditions, a Photovoltaic module is likely to experience conditions that produce more
current and/or voltage than reported at standard test conditions. Accordingly, the values of Isc and Voc
marked on this module should be multiplied by a factor of 1.25 when determining component voltage
ratings, conductor ampacities, fuse sizes, and size of controls connected to the PV output.
Voltages are additive when modules are connected in series, and modules currents are additive when
Modules are connected in parallel, as illustrated in Figure 1.
Modules with different electrical characteristics must not be connected directly in series.
Series wiring
Parallel wiring
Figure 1: Electrical diagrams of series and parallel wiring.
The maximum number of Modules that can be connected in series within a string must be calculated in
accordance with applicable regulations in such a way that the specified maximum system voltage (The
maximum system voltage of bifacial module is DC 1500V) of the modules and all other electrical DC
components will not be exceeded in open-circuit operation at the lowest temperature expected at the PV
system location.
