Installation
and
Operation
Manual
(REV
H)
PVI
6500
/
PVI
7500
66
7
Technical
Data
7.1
Technical
Information
and
specifications
Input
(DC)
from
PV
array:
Maximum
open
circuit
voltage
of
PV
array:
600V
DC
WARNING:
Local
codes
must
be
followed
to
calculate
the
maximum
number
of
PV
modules
allowed
for
a
maximum
inverter
open
circuit
voltage
(OCV)
of
600V
DC
in
extreme
cold
temperatures
for
the
installation
location.
The
open
circuit
voltage
of
PV
modules
depends
on
the
cell
temperature
and
the
solar
irradiation.
The
highest
open
circuit
voltage
occurs
when
the
PV
modules
are
at
the
coldest
temperature
and
in
bright
sun.
(See
the
following
figure
–
Fig.
7.5)
Fig.
7.1.1
Example
representative
~100W
PV
module
voltage
–
current
characteristic
at
various
cell
temperatures
Because
PV
modules
also
have
a
reduction
in
voltage
at
high
cell
temperatures,
you
must
make
sure
the
MPP
voltage
of
the
strings
will
not
drop
below
the
minimum
inverter
DC
input
voltage
of
230V
DC
in
very
hot
temperature
conditions,
including
wire
losses
and
voltage
drop
in
order
to
avoid
reduced
system
performance.
Both
the
maximum
open
circuit
voltage
(OCV)
when
at
cold
extreme
and
minimum
MPP
voltage
when
at
hot
extreme
can
be
calculated
for
a
PV
module
using
its
specification
sheet.
Solectria
Renewables’
online
PV
module
string
sizing
tool
can
then
be
used
to
determine
how
many
modules
can
be
used
in
a
string.
0
2
4
6
8
0
10
20
30
DC Curr
ent
(A)
Voltage (VDC)
at 50 deg C
at 20 deg C
at -20 deg C