Astronergy CHSM6612M Kurulum Kılavuzu - Sayfa 14
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6
Electrical Installation
6.1
Electrical characteristics
The electrical characteristics are detailed in the PV
module product manual.
The rated values of electrical characteristics, including
I
, V
and P
, have some tolerance with the
sc
oc
mpp
measured values at standard condition: ±5% for I
±3% for V
and ±3% for P
oc
condition refers to 1000W/m
temperature at 25℃.
According to IEC and UL standards, the standard
maximum system voltage for the regular module series
is 1000V, the 1500V standard products are also
available according to the requirements. The IEC &
UL standard maximum system voltage for half-cell
module series is 1500V (except for BL &LV series PV
modules).
The actual maximum voltage must be less than the
standard maximum system voltage and the maximum
output voltage of the inverter and other electrical
equipment installed in the system. The number of PV
modules connected in series should match the voltage
specification of the inverter. The total voltage
generated by PV modules in series should not be
higher than the maximum voltage allowed by the
system.
To ensure the above requirements, the open-circuit
voltage of the string needs to be calculated at the
lowest expected ambient temperature at certain
location. This can be calculated using the following
formula:
Maximum system voltage≥N*V
14
,
sc
. The standard test
mpp
2
, AM1.5 and cell
*[1+TC
*(T
-25)]
oc
voc
min
Where:
N: number of PV modules in a single string
V
: open-circuit voltage of each PV module (refer to
oc
the PV module nameplate or product manual)
TC
: temperature coefficient of PV module for
voc
open-circuit voltage (refer to the PV module product
manual)
T
: minimum ambient temperature.
min
！ATTENTION
Under normal operating conditions, the output
current and/or voltage of the PV module may be
higher than the value under standard testing
conditions. Therefore, in PV system design, for
example
determining
equipment, current carrying capacity of wires and
fuse and parameters associated with the output
power
of
PV
modules,
short-circuit current and open-circuit voltage
should be applied with a safety factor of 1.25. The
number of PV modules connected in series should
match the voltage specification of the inverter. The
total voltage generated by the PV modules
connected in series cannot be higher than the
maximum voltage allowed by the system.
According to the National Electrical Code 690.8,
the parameters need to be multiplied by an
additional 125% (80% derating) factor, i.e. the
parameters including the optimum operating
current and voltage at standard test condition (STC)
needs to be multiplied by the square of 1.25 when
determining voltage ratings, conductor capacities,
fuse ratings, and control sizes for PV output.
the
rated
voltage
the
corresponding
of