14
current and 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 module voltage ratings, conductor
current ratings, fuse sizes, and size of controls connected to the PV output.
7.1.2
Try to use the modules with the same configuration in the same PV system. If the modules are connected
in series, the total voltage is the sum of voltages of all the modules. The maximum voltage of string does not
exceed the maximum system voltage of the modules (the maximum system voltage of Sunerg Solar modules is
1500V), the maximum number of modules that can be connected in a series string must be calculated in
accordance with applicable regulations, make sure the open circuit voltage of string does not exceed the
maximum system voltage of the modules and the other electrical DC modules required at the minimum
temperature at the PV system location. Using the following formula:
System voltage=N*Voc*[1
＋
λv
oc
(Tmin - 25℃)]
N——
number of modules in series
Voc——
open circuit voltage at STC (refer to product label or data sheet)
λv
oc
——
Thermal coefficient of Voc of each module (refer to product data sheet)
Tmin——
minimum ambient temperature at the PV system location
7.1.3
If the PV system requires the installation of high current, several PV modules can be connected in
parallel, and total current is the sum of current of all the modules. The maximum parallel number of the
modules N= Imax (fuse rating) /Isc.
7.1.4
An over-current protection device with appropriately rated must be used when reverse current could
exceed the value of the maximum fuse rating of the module, an over-current protection devices is required for
each series string if more than two series strings are connected in parallel.
7.1.5
When installing the module, place the end with the junction box up and try to avoid the rain.
7.1.6
Do not carry out installation in rainy weather, because humidity will void the insulation protection, Thus
cause safety accidents.
7.2 Cables and wiring
7.2.1
Use a junction box with a degree of protection IP67 or above. The junction box has a connected cable
and connector. Each module has two single-conductor wires, one positive and one negative, which are
pre-wired inside the junction box. Installers can connect two modules by firmly inserting the positive
connector of a module into the negative connector of the other module. Refer to the following table for details
of junction box.
7.2.2
Never perform pretreatment to modules including connector, junction box and cable with lubricating oil
or cleaning agent made of alkanet materials during installation.
7.2.3
The cross section area of the cable and connector capacity selected must satisfy the maximum
short-circuit current of the system (It is recommended that the cross section area of the cable used for the
single module is 4mm
2
, Please note that the temperature limit range of the cable is -40℃
～
+90℃).
7.2.4
When fastening the cables to the supporting rail, pay attention to avoid mechanical damage to the cables
or modules, and also making a special design to protect the cables from environmental corrosion and direct
sunshine, for example, put the cable into the supporting beam or special pipes with UV-resistant materials. The
cables designed are sunlight resistant and waterproof, but also to avoid direct sunlight exposure and water
immersion of the cables.
7.3 Connectors
