Installation and operator’s manual
Page 58 of 65
PVI-2000-OUTD-AU Rev.: 1.0)
8
TECHNICAL FEATURES
8.1
Input Values
WARNING:
the Photovoltaic field and system wiring must be configured so
that the PV input voltage is less than the maximum upper limit independently
from the type, the number and the operating conditions of the chosen
photovoltaic panels.
As panel voltage also depends on working temperature, the number of panels
per string shall be chosen according to the min. ambient temperature
expected in that special area (see table A).
WARNING
: The inverter has a linear power derating related to the input
voltage, starting from 530 Vdc (100% output power) to 580 Vdc (0% output
power)
WARNING
: The open circuit voltage of the photovoltaic panels is affected
by the ambient temperature (the open circuit voltage increases as the
temperature decreases). Make sure that at the minimum temperature
estimated for the installation does not cause the panels to exceed the
maximum upper limit of 600Vdc. As an example, the following table shows
for typical panels of 36, 48 and 72 cells, the maximum voltage of each panel
as function of the temperature (assuming a nominal open circuit voltage of
0.65Vdc at 25°C and a temperature coefficient of 0,0023V/°C). The table
shows, therefore, the maximum number of panels that can be connected in
series as a function of the minimum temperature at which the system will
operate. Consult the panel manufacturer for the correct temperature
coefficient of V
oc
, before calculating the voltage rating of the photovoltaic
array.