D69-P06-01 GB R6
01/07/2020
www.photowatt.com
7
•
A maximum of two strings can be connected
in parallel without the need to incorporate an
over- current protection device (fuses, etc.) in
series within each string. Three or more strings
can be connected in parallel if an appropriate,
certified over-current protection device is ins-
talled in series within each string. And it shall
be ensured in the PV system design that the
reverse current of any particular string is lower
than the module maximum fuse rating at any
circumstance.
•
For high power density modules such as CS1
series intended to be used on rooftop appli-
cations, in agreement with IEC 62548: 2016
Photovoltaic (PV) arrays design requirements,
blocking diodes should be used in each PV array
module string as exclusive mean of protection
against reverse currents where three or more
strings are connected in parallel. Where per-
mitted by your local electrical code, blocking
diodes can also be used for overcurrent protec-
tion, in place of fuses or other OCPD devices.
•
Only modules with similar electrical outputs
should be connected in the same string to
avoid or minimize mismatch effects in arrays.
•
To minimize risk in the event of an indirect
lightning strike, avoid forming loops with the
wiring when designing the system.
•
The recommended maximum series fuse rating
is stated in a table in the Annex C.
•
Modules should be safely fixed to bear all ex-
pected loads, including wind and snow loads.
•
A minimum clearance of 6.5 mm (0.25 in)
between modules is required to allow for ther-
mal expansion of the frames.
•
The small drainage holes on the underside of
the module must not be blocked.
OPTIMUM ORIENTATION AND TILT
To maximize your annual yield, find out the optimum
orientation and tilt for PV modules in your region.
The highest yields are achieved when sunlight
shines perpendicularly onto the PV modules.
AVOID SHADING
•
Even minor partial shading (e.g. from dirt depo-
sits) reduces yields. A module can be conside-
red to be unshaded if its entire surface is free
from shading all year round. Sunlight should be
able to reach the module even on the shortest
day of the year.
•
Constant shading conditions can affect module
service lifetime, due to accelerated ageing of
the encapsulation material and thermal stress
on the bypass diodes.
RELIABLE VENTILATION
•
Sufficient clearance (at least 10 cm (3.94 in))
between the module frame and the mounting
surface is required to allow cooling air to
circulate around the back of the module. This
also enables condensation or moisture to
dissipate.
•
According to UL 1703, any other specific
clearance required for maintaining a system
fire rating should prevail. Detailed clearance
requirements pertaining to system fire ratings
must be provided by your racking supplier.
5.1
MODULE WIRING
CORRECT WIRING SHEME
•
Cable management scheme should be re-
viewed and approved by the EPC contractor,
in particular required cable lengths should be
cross-checked considering the specificities of
the tracker structure like bearing house gaps.
If longer cable or additional jumper cable is re-
quested, please contact EDF ENR PWT’s sales
representative in advance.
•
Ensure that the wiring is correct before starting
up the system. If the measured open circuit vol-
tage (Voc) and short-circuit current (Isc) differ
substantially from the specifications, this indi-
cates that there is a wiring fault.
•
When modules have been pre-installed but the
system has not been connected to the grid
yet, each module string should be kept under
open-circuit conditions and proper actions
should be taken to avoid dust and moisture pe-
netration inside the connectors.
•
For PW72HT, PW60HT, PW72LHT and PW60LHT
series modules, EDF ENR PWT offers optional
cable specifications to match various system
configurations. Recommended system cable
schemes are shown in Table 2 below :
Summary of Contents for PW60HT-C-XF
Page 1: ...INSTALLATION MANUALS For professional use only...
Page 2: ...INSTALLATION MANUAL FOR STANDARD MODULES For professional use only...
Page 27: ...INSTALLATION MANUAL OF DOUBLE GLASS MODULES For professional use only...
Page 42: ...INSTALLATION MANUAL OF BIFACIAL MODULES For professional use only...
