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the corresponding open-circuit voltage of the module
under STC condition, and
on-site temperature. 25 ℃ is the standard cell
temperature, and x% is the temperature coefficient
corresponding to the open-circuit voltage from the
panel spec sheet.
When the modules connect in parallel, the output
current will be equal to the sum of each branch
current. We suggest that every series SPV module
string should be fused prior to be connected with
other strings. The maximum number of modules:
N = I
(maximum fuse current)/I
max
Please refer to the applicable regional and local
codes for additional fuse requirements.
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 value of Isc marked on this
module should be multiplied by a factor of 1.25
when
determining
ampacities, fuse sizes, and size of controls
connected to the PV output.
Refer to Section 690-8 of the National Electrical
•
Code for an additional multiplying factor of
125% (80% derating） which may be applicable.
That means, when determining the voltage
rating, conductor capacity, fuse rating, and
photovoltaic output control size, the parameters
need to be multiplied by the square of 1.25.
According to the max fusing rate of modules
•
and local electical installation standard, the
parallel connection of PV module arrays should
use the proper fuse to protect the circuit.
8 Star Energy Pty Ltd | Level 35, 477 Collins Street, Melbourne VIC 3000 | https://www.energizersolar.com
17
8 Star Energy ESS Ltd | The Black Church, St Mary's Place, Dublin DO7 P4AX, Ireland
T
(°C)
is the lowest
min
.
sc
component
conductor
7.2 Installation conditions
In order to ensure the normal operation of the
system, when connecting photovoltaic modules or
connecting loads (such as inverters, batteries, etc.),
observe to ensure that the polarity of the cable is
connected correctly. If the PV module is not
connected correctly, the bypass diode may be
damaged. Figure 12 shows the connection of
photovoltaic modules in series and parallel. PV
photovoltaic modules can be wired in series to
increase the voltage. The series connection is to
connect the wiring from the positive terminal of one
photovoltaic module to the negative terminal of the
next photovoltaic module. PV photovoltaic modules
can be connected in parallel to increase current.
Parallel connection is to connect the wiring from the
positive terminal of one photovoltaic module to the
positive terminal of the next photovoltaic module. If
the PV module is not connected correctly, the
bypass diode may be damaged.
Figure 17 Schematic diagram
of electrical connection
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