Testing standards
Wire diameter
Temperature range
Voltage
UL4703
12AWG
-40oC to +85oC
1500V
The number of modules in series connection in each strand shall be calculated as
per requirements. The open circuit voltage value under the expected lowest
temperature shall not exceed the maximum system voltage value stipulated for
modules (GRUPPOSTG module maximum system voltage is DC1500V according to
UL 1703) and other values required by DC electric parts.
Maximum series overcurrent protective device, where required.
If there is reverse current exceeding the maximum fuse current flowing through
the module, use overcurrent protection device with the same specifications to
protect the module; if parallel connection strands are more than 2, there shall be
an overcurrent protection device on each strand of module. See Figure 5.
6.2 Cables and connecting lines
In module design, adopt enclosed connecting boxes with the protective level of
IP68 for on- site connection to provide environmental influence protection for
wires and connections and contacting protection for non-insulating electric parts.
The connecting box has well connected cables and connectors with the protective
level of IP68. These designs facilitate parallel connection of modules. Each module
has two independent wires connecting the connecting box, one is negative pole
and the other is positive pole. Two modules can be in parallel connection by
inserting the positive pole at one end of wire of one module into the negative pole
of the adjoining module.
Cables connecting modules shall satisfy the module maximum short circuit
current. Adopt the special PV system sunlight resistant cables.
The minimum standards of cables connecting modules are:
When cables are fixed on the bracket, avoid mechanical damage to cables or
modules. Do not press cables by force. Adopt special designed light resistant wires
and clamps to fix cables on the bracket. Though cables are light resistant and
water proof, it is still necessary to prevent cables from direct sun radiation and
water immersion.
6.3 Connector
Please keep connectors clean and dry. Make sure connector nuts are fastened
before connection. Do not connect connectors that are damp or dirty or under
other status. Protect connectors from direct sun radiation and water immersion or
fall onto ground or roof.
Wrong connection may lead to electric arc and electric shock. Please make sure
that all electric connection is reliable. Make sure all connectors with lock are fully
locked.
Installation Manual PV Modules High Power Half Cut
13
