Operator`s manual

Installation and Operator’s Manual Page 56 of 62
(PVI-2000-OUTD-UK
Rev: 1.0)
8 TECHNICAL FEATURES
8.1 Input Values
WARNING: the Photovoltaic field and system wiring must be
configured in such a way 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 open circuit voltage of the photovoltaic panels is
affected by the ambient temperature (the open circuit voltage increases
as the temperature decreases). You have to make sure that at the
minimum temperature estimated for the installation doesn’t 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 an
increase of 0.0023V/°C for a decrease of temperature. 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.
NOTE: 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)