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Alternatively, a more accurate correction factor for the
open-circuit voltage can be calculated using the following
formula:
T (°C) is the lowest expected ambient temperature at the
system installation site
α
Voc
(%/ºC) is the voltage temperature coefficient of the
selected module (refer to corresponding datasheet)
OCPD rating selection should be done per the following
guidance, where the minimum OCPD rating possible is
determined by calculating the expected maximum cir-
cuit current for the PV system, and the maximum OCPD
rating constrained by the IEC 61215: 2016 and UL 1703:
2018 standard requirements for the certified PV modu-
les.
Minimum string fuse rating < X ≤ Maximum string fuse
rating
The maximum string fuse ratings can be found in ANNEX
A: Mechanical And Electrical Ratings for all the certified
Canadian Solar bifacial module types.
The minimum string fuse rating for compliance with
NEC: 2017 code and IEC62548: 2016 requirement is sug-
gested to be determined as follows:
Minimum string fuse rating = IscSTC x 1.25 x Max (1.175,
Imppα ÷ ImppSTC)
Imppα = the highest 3-hour current average resulting
from the simulated local simultaneous irradiances on
the front and rear sides of the PV array accounting for
elevation and orientation
IscSTC = the listed short circuit current at 0% bifacial
gain on the PV module datasheet or nameplate label
ImppSTC = the listed MPP operating current at 0% bi-
facial gain on the PV module datasheet or nameplate
label
An assembly, together with its overcurrent device (s),
that is listed for continuous operation at 100 percent of
its rating shall be permitted to be used at 100 percent of
its rating, and therefore shall not require the additional
1.25 multiplier
C
VOC
= 1-α
Voc
ˣ (25 - T)
Appropriate correction factors should be selected by
licensed professional electrical engineers according to
relevant design codes and system simulation results.
Canadian Solar does not take responsibility for the deter-
mination of the minimum series fuse rating.
4.0
UNPACKING AND STORAGE
PRECAUTIONS
· Modules should be stored in a dry and ventilated en-
vironment to avoid direct sunlight and moisture. If
modules are stored in an uncontrolled environment,
the storage time should be less than 3 months and ex-
tra precautions should be taken to prevent connectors
from being exposed to moisture or sunlight, like using
connector endcaps. Specific T4 connector endcaps are
available upon request.
·
Unpack module pallets carefully, following the steps
shown on the pallet. Unpack, transport and store the
modules with care.
·
Modules must always be unpacked and installed by
two people. Always use both hands when handling
modules.
·
Do not
lift modules by their wires or junction box.
·
Do not
stack the frameless and framed modules.
·
Do not
place excessive loads on the module or twist
the module.
·
Do not
stand, step, walk and/or jump on modules
under any circumstances. Localized heavy loads may
cause severe micro-cracks at cell level, which in turn
may compromise module reliability and void Canadian
Solar Inc’s warranty.
