14
Depending on the maximum rated fuse current of the
PV module and the local electrical installation
standards, the connection of parallel strings of PV
modules needs to be equipped with suitable fuses
or preventive diodes for circuit protection purposes.
6.2
Electrical connection
To ensure the normal operation of the system, make sure
the polarity of cables is correct when connecting
modules or loads, such as inverters and batteries. If the
PV module is not connected correctly, the bypass diode
may be damaged. Fig. 14 shows how the PV modules
are connected in series and parallel. PV modules can be
wired in series to boost the voltage. Series connections
are made by connecting the wire from the positive
terminal of one module to the negative terminal of the
next module. PV modules can be wired in parallel to
increase the current by connecting the positive terminal
of one module to the positive terminal of the next
module. If a module is not connected correctly, the
bypass diode may be damaged.
Fig. 14 Schematic diagram of electrical connection
！
ATTENTION
If one PV module string (or PV array) is connected
to
another with opposite polarity, irreversible damage
can be caused to the PV module product. Be sure to
confirm the voltage and polarity of each string
before
making
a
parallel
connection.
If
measurements reveal opposite polarity or a voltage
difference greater than 10V between the strings,
check
their
structural
configuration
before
proceeding with the connection.
The number of modules connected in series and
parallel should be reasonably designed according to the
system configuration.
