22
N
number of modules in series
Voc
open circuit voltage at STC (refer to product label or data sheet)
λvoc 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
The junction boxes with IP67 protection class have been designed to be easily interconnected in series by
the connectors. 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.
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 4mm2, Please note that the temperature limit range of the cable is -40℃
～
+90℃).
7.2.4
When fastening the cables to the supporting system, pay attention to avoiding 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.
7.2.5
The cables designed are sunlight resistant and waterproof, but also to avoid direct sunlight exposure and
water immersion of the cables.
7.3 Connectors
7.3.1
When connecting modules, make sure that the connectors of the same series module shall come from the
same manufacturer or totally be compatible with each others, and the same requirements shall go to the
connection terminals of series string and PV system, because the connectors from different manufacturers may
