GCL System Integration Technology Co., Ltd.
Bring Green Power to Life
20
ELECTRICAL INSTALLATION
DC power generated by the photovoltaic system can be converted into AC power and fed
into the grid. Policies on connecting renewable energy system to the grid vary from region to
region. Consult senior system designer before designing the system. Generally, the system
installation shall be formally approved by the local public sector.
General Installation
Installation structure should be compatible with module, in order to avoid galvanic
corrosion. Any defects caused by such corrosion will void the warranty.
The DC-side system potential of the photovoltaic array includes the practice of floating
ground, positive-pole grounding and negative-pole grounding according to the system
requirements; and different cell technologies have different adaptability. In a
power-station project, particularly the module of the crystalline silicon photovoltaic cells,
too large an absolute value of the negative to the ground might cause potential induced
degradation (PID). Consequently, it is appropriate to use the negative grounding system
so that the potential of the circuit is positive. Consult the inverter manufacturer for
details.
It is forbidden for non-professionals to open the lock nuts of the connector. Make sure
that the connectors are clean, dry and fully connected.
(A click sound should be heard when fully connected), otherwise it may lead to electric
arc sparks which will damage the connector or cause a fire.
Under normal conditions, a module is likely to experience conditions that produce more
current and/or voltage than reported at standard test conditions, Accordingly, the values
of ISC and VOC marked on the Module should be multiplied by a factor of 1.3 when to
determining component voltage ratings, current ratings, fuse sizes, and size of controls
connected to the PV output.
Completely cover the Modules with an opaque material to prevent electricity from being
generated during disassembling the conductors.
It is not allowed to use the Modules in different models in the same solar photovoltaic
system. When the Modules are connected in series, the voltage of every string shall not
be higher than the maximum voltage of the system (as shown in Figure 8). Reference
equation of the maximum number of the Modules in serial connection: maximum system
voltage of the module/ (1.3* open-circuit voltage).
When connected in parallel, the current output is equal to the sum of each string’s current
(as shown in Figure 9). Fuse is necessary for each module string. Take reference to the
local regulation. Recommended maximum parallel Modules configurations: Fuse rating/
(1.3* short-circuit current).
