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Photovoltaic array and inverter compatibility
Make sure that:
• The PV modules and DC cables are Protection Class II certified (double
insulated).
• The PV modules are not grounded to the DC+ or DC- terminals.
• The PV modules are of the same type and that they have a IEC 61730 Class A
rating.
• The PV strings have an equal configuration for optimized energy output.
• The PV string and array maximum short-circuit currents and open-circuit voltages
for DC inputs match the rated values of the inverter under local ambient
conditions. Refer to
• The PV array operating voltage range is in the MPPT voltage range at all ambient
temperatures. Refer to
increase in low ambient temperatures.
• The -SX model is equipped with 15 A string fuses (refer to
123
for fuse types). Make sure that the 15 A string fuses are sufficient and
compatible with the PV array design and installation materials. The nominal
current of the string fuses is defined at 25 °C. Take into account the possible
temperature deviations when you select fuses.
String fuse nominal current rating I
• Read the nominal short-circuit current I
module.
• Read the maximum allowed series fuse rating or reverse current rating I
data sheet of the PV module.
• Define the conductor current carrying capacity I
the planned installation conditions.
• The correct nominal current rating I
conditions:
I
> 1.56 × I
FN
SC
I
≤ I
or if I
FN
R
R
I
≤ I
FN
C
When you use this formula to select the fuses, take into account the factors that
can cause adjustments to the formula:
•
The thermal derating of the fuse.
•
The effective radiation at the installation site.
•
The PV module I
•
The maximum return current of the PV modules.
Technical data
Technical data
is not specified in module data sheet I
temperature dependence at the site.
sc
Installation requirements 35
on page 123.
on page 123. The string voltage tends to
FN
rating from the data sheet of the PV
SC
of the used string cable type in
C
of the string fuse in the planned installation
FN
FN
Technical data
on page
from the
R
< 2 × I
SC
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