15
Excessive cables must be organized or fixed in an adequate way, e.g. attached to the mounting structure by
using non-metallic cable ties.
Solar cables, connectors and junction boxes should not be exposed to water, snow,
or rain or water submersion for a long period of time (IP65/67/68).
For applications requiring high operating voltage several modules can be connected in series to form a
string of modules; the system voltage is then equal to the sum of the voltage of each module.
For applications requiring high operating currents several strings of modules can be connected in parallel;
the system current is then equal to the sum of the current of each string of modules.
The maximum system voltage is 600 volts, 1000 volts or 1500 volts depending on the product family DC
according to standards. The maximum number of series connected modules depends on system design, the type
of inverter used and environmental conditions.
Based on the maximum series fuse rating of module and local electrical installation code, always make sure
Suntech PV modules are assembled with the appropriate string fuse for circuit protection.
There is no specific limitation on the number of modules that can be connected in parallel, the number of
modules is determined by system design parameters such as current or power output.
To prevent the cables and the connectors from overheating, the cross section of the cables and the capacity
of the connectors must be selected to suit the maximum system short circuit current. The recommended cable is
PV wire with a cross section of at least 4mm
2
.
Caution: do not secure the cables too tight. Any cable damage caused by cable management system is not
covered under Suntech's warranty.
Always refer to the cable manufacturer's bending radius which includes the radius just behind the
connectors.
When designing large modules arrays connected to a single inverter, always take into account the resulting
isolation resistance (Riso), which decreases increasing the number of modules in the array. A too low Riso can
results in inverter faults. Please refer to local regulations to determine the system wires size, type and
temperature.
Suntech modules come with connectors used for system electrical connections. The recommended
connectors are STP-XC4, TL-CABLE01S, MC4, and Amphenol H4. Suntech strongly recommends using the genuine
connector type specified by Suntech's product data sheet. Choosing a different connector type other than
specified may cause the warranty invalid.
To ensure reliable electric connection and to prevent possible intrusion of humidity, two connectors must
be mated and locked together until a click can be heard.
Long-term exposure to wet environments may cause connectors' poor connectivity, resulting in current
leakage and poor conductivity which voids the warranty. Suntech recommends proper connector/cable/wire
management to prevent moisture intrusion. Depending on the amount of humidity, Suntech recommends
periodic inspections of the installation system to maintain optimal module performance.
The DC current generated by photovoltaic systems can be converted into AC and fed into a public Grid. As
local utilities’
policies on connecting renewable energy systems to the Grids vary from region to region. Always
seek the advice from a qualified system designer or integrator. Building permits, inspections and approvals by
the local utility are generally required.
Especially for larger installations Suntech recommends lightning protection following the local requirements
and regulations.
When the installation finished and after connecting to the grid, please do a professional hand over to the owner
including an installation protocol is required. Provide a clear documentation of the system to the owner
consisting of following minimum data such as: user guide, system layout, data sheets, performance expectations,
electrical system data e.g. a copy of the installation test report following minimum requirements of IEC 62446
/ IEC 60364-6.
Electrical property
Module under standard test conditions of: irradiance of 1000W /m
2
, cell temperature of 25 °C and air mass of
AM1.5.
Normally, a module is likely to produce more current and/or voltage than reported at standard test
conditions.. Accordingly, the values of I
sc
and V
oc
marked on this module should be multiplied by a factor of 1.25
when determining component voltage ratings, conductor ampacities, fuse sizes, and size of controls connected
to the PV output.
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