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JA SOLAR INSTALLATION MANUAL
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JA SOLAR INSTALLATION MANUAL
Rated electrical characteristics such as Isc, Voc and Pmax are measured /- 3% of
measurement uncertainty at Standard Test Conditions. Standard Test Conditions: 1000 W/m
2
Irradiance, 25°C Cell Temperature and 1.5 Air Mass.
Under normal conditions, photovoltaic Modules may produce higher current and/or voltage
than reported at Standard Test Conditions. Accordingly, the values of short circuit current,
Isc, and open circuit voltage, Voc, marked on Modules should be multiplied by a factor of
1.25 when determining component voltage ratings, conductor capacities, fusing sizes, and
size of controls connected to the Modules output.
Voltages are additive when Modules are connected directly in series, and Modules currents
are additive when Modules are connected directly in parallel, as illustrated in Figure 5.
Modules with different electrical characteristics must not be connected directly in series.
6. ELECTRICAL INSTALLATION
6.1 Electrical Property
Series wiring and Parallel wiring
Series wiring
Parallel wiring
Figure5:
Electrical diagrams of series and parallel wiring
Over-current
protection devices
Connector
Diodes
The maximum number of Modules that can be connected in a series string must be
calculated in accordance with applicable regulations in such a way that the specified
maximum system voltage (The maximum system voltage of JA Solar Modules is DC 1000V
according to the safety appraisal of the IEC61730) 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.
Correction factor for the open-circuit voltage can be calculated based on the following
formula: C
Voc
=1-
β
Voc
×(25-T). T is the lowest expected ambient temperature at the system
location.
β
(%/
℃
) is the temperature coefficient of the selected module Voc (Refer to
corresponding datasheet).
An appropriately rated over-current protection device must be used when the reverse
current could exceed the value of the maximum fuse rating of the Modules. An over-current
protection device is required for each series string if more than two series strings are
connected in parallel
These junction boxes have been designed to be easily interconnected in series for their
well-connected cable and the connector with IP67 protection grade. Each Modules has
two single-conductor wires, one positive and one negative, which are pre-wired inside
the junction box. The connectors at the opposite end of these wires allow easy series
connection of adjacent Modules by firmly inserting the positive connector of a Module into
the negative connector of an adjacent Module until the connector is fully seated.
Use field wiring with suitable cross-sectional areas that are approved for use at the
maximum short-circuit current of the Modules. JA Solar recommends installers use only
sunlight resistant cables qualified for direct current (DC) wiring in PV systems. The minimum
wire size should be 4mm2.
Rating Required Minimum Field Wiring
6.2 Cables and Wiring
Testing Standard
Wire size
Temperature Rating
TÜV 2 PfG 11694
4mm2
-40ºC to +90ºC
ELECTRICAL INSTALLATION
ELECTRICAL INSTALLATION
