D84-P06-01 GB R2
28/07/2020
www.photowatt.com
4
3.0
MECHANICAL / ELECTRICAL SPECIFICATIONS
Module electrical ratings are measured under
Standard Test Conditions (STC) of 1000 W/m2 irra-
diance, with an AM 1.5 spectrum, and a cell tempe-
rature of 25°C. Detailed electrical and mechanical
characteristics of EDF ENR PWT crystalline silicon
PV modules can be found in Annex A (Mechanical
And Electrical Ratings) of this Installation Manual.
Main electrical characteristics under STC are also
stated on each module label. Please refer to the da-
tasheet or the product nameplate for the maximum
system voltage.
Under certain conditions, a module may produce
more current or voltage than its Standard Test Condi-
tions rated power. For Bifacial modules particularly,
the operating current is related to specific system
mounting and design conditions, and will vary un-
der different module mounting height and albedo
of ground surface. As a result, correction factors
should be applied to the module short-circuit cur-
rent and the open-circuit voltage under STC, when
determining component ratings and capacities.
For open-circuit voltage, the most conservative
correction factors presented in Table 1 below gene-
rally applies.
TABLE 1. LOW TEMPERATURE CORRECTION
FACTORS FOR OPEN-CIRCUIT VOLTAGE
Lowest Expected Ambient
Temperature (°C/°F)
Correction factor
24 to 20 / 76 to 68
1.02
19 to 15 / 67 to 59
1.04
14 to 10 / 58 to 50
1.06
9 to 5 / 49 to 41
1.08
4 to 0 / 40 to 32
-1 to -5 / 31 to 23
1.10
1.12
-6 to -10 / 22 to 14
1.14
-11 to -15 / 13 to 5
1.16
-16 to -20 / 4 to -4
1.18
-21 to -25 / -5 to -13
1.20
-26 to -30 / -14 to -22
1.21
-31 to -35 / -23 to -31
1.23
-36 to -40 / -32 to -40
1.25
C
voc
= 1-
α
Voc
x (25 - T)
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 da-
tasheet)
OCPD rating selection should be done per the fol-
lowing guidance, where the minimum OCPD rating
possible is determined by calculating the expected
maximum circuit current for the PV system, and
the maximum OCPD rating constrained by the IEC
61215: 2016 and UL 1703: 2018 standard require-
ments for the certified PV modules.
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 EDF ENR PWT bifacial module types.
The minimum string fuse rating for compliance with
NEC: 2017 code and IEC62548: 2016 requirement is
suggested to be determined as follows:
Minimum string fuse rating = IscSTC x 1.25 x Max
(1.175, Impp
α
÷ ImppSTC)
Impp
α
= the highest 3-hour current average re-
sulting from the simulated local simultaneous ir-
radiances on the front and rear sides of the PV
array accounting for elevation and orientation
IscSTC = the listed short circuit current at 0% bi-
facial gain on the PV module datasheet or name-
plate label
ImppSTC = the listed MPP operating current at
0% bifacial 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;
Appropriate correction factors should be selected
by licensed professional electrical engineers accor-
ding to relevant design codes and system simula-
tion results.
EDF ENR PWT does not take responsibility for the
determination of the minimum series fuse rating.
Alternatively, a more accurate correction factor for
the open-circuit voltage can be calculated using
the following formula:
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...
