PHOTOWATT PW60HT-C-XF, Installation Manual

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D81-P06-01 GB R5 28/07/2020 www.photowatt.com
6
5.1
MODULE WIRING
CORRECT WIRING SCHEME
•
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.
CORRECT CONNECTION OF PLUG CONNECTORS
•
Make sure that all connections are safe and pro-
perly mated. The PV connectors should not be
subjected to stress from the exterior. Connec-
tors should only be used to connect the circuit.
They should never be used to turn the circuit
on and off.
•
Connectors are not waterproof when unmated.
When installing modules, connectors should be
connected to each other as soon as possible or
appropriate measures (like using connector en-
dcaps) should be taken to avoid moisture and
dust penetrating into the connector.
USE OF SUITABLE MATERIALS
•
Only use dedicated solar cable and suitable
plugs (wiring should be sheathed in a sun-
light-resistant conduit or, if exposed, should
itself be sunlight-resistant) that meet local fire,
building and electrical regulations. Please en-
sure that all wiring is in perfect electrical and
mechanical condition.
•
Installers may only use single-conductor cable
listed and labeled as USE-2 or PV wire which is
90°C wet rated in North America, and single
conductor cable 2.5-16 mm² (5-14 AWG), 90°C
wet rated in other areas (i.e. TUV 2PfG1169 or
EN50618 approved), with proper insulation
which is able to withstand the maximum pos-
sible system open- circuit voltage.
•
Only copper conductor material should be used.
Select a suitable conductor gauge to minimize
voltage drop and ensure that the conductor am-
pacity complies with local regulations (i.e. NEC
690.8(D)).
hin each string. Three of more strings can be
connected in parallel if an appropriate and cer-
tified over-current protection device is installed
in series with each string.
•
Only modules with similar electrical outputs
should be connected in the same series to
avoid or minimize mismatch effects in arrays.
•
To minimize risk in the event of an indirect light-
ning strike, avoid forming loops when designing
the system.
•
The recommended maximum series fuse rating
is stated in a table in the Annex.
•
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 opti-
mum 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 the yield. A module can be consi-
dered to be unshaded if its entire surface is free
from shading all year round. Sunlight should be
able to reach at least the front side of the mo-
dule 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 circu-
late around the back of the module. This also
enables condensation or moisture to dissipate.
•
According to UL 1703, any other specific clea-
rance required for maintaining a system fire ra-
ting should prevail. Detailed clearance require-
ments pertaining to system fire ratings must be
provided by your racking supplier.