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Installation and Operator's Manual
(PVI-3.0/3.6/4.2-OUTD-x-US Rev: 2.1)
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 Aurora Inverter is provided with a linear output power
derating depending on 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). You have to make sure that 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 a function of the temperature (assuming a nominal open circuit
voltage of 0.6Vdc per cell 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 Voc, before calculating the maximum voltage of
the photovoltaic array.
Page 91 of 108
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