Installation and Operation Manual Page 17 of 104
(PVI-3.8/4.6-I-OUTD-US Rev.: 1.1)
WARNING: To avoid equipment damage, the string voltage must not
exceed 520 Vdc for any reason. Because of the negative thermal coefficient
of the photovoltaic modules' open circuit voltage, maximum voltage is
obtained in conditions of minimum environmental temperature. It is
recommended to check the photovoltaic generator's configuration with the
Aurora Designer dimensioning software.
NOTE: A minimum Vstart input voltage of 200 Vdc ( the voltage can be set
from the control panel in a range between 120 Vdc and 350 Vdc) is required
for the Aurora inverter to start the grid connection sequence. Once
connected, the inverter will transfer the maximum available power for any
Vdc input voltage value in a range between 70% of the value set by Vstart
and 520V to the grid (see Fig. 31 and Fig. 32
Fig. 1
for clarification).
The current of each array must also be within the inverter's limits. For AURORA the
maximum current from each input can be 14 Adc for PVI-4.6-I-OUTD, 12.5 A for
PVI-3.8-I-OUTD.
If the output of photovoltaic system exceeds the capacity of a single inverter,
additional AURORA inverters can be added to the system; each inverter will be
connected to an adequate section of the photovoltaic field on the DC side and to the
distribution network on the AC side.
Every AURORA inverter works independently of the others and feeds power into the
grid with the maximum power available from its own section of photovoltaic panels.
Decisions on how to structure a photovoltaic system depend on a number of factors
and considerations, such as the type of panels, the available space, the future location
of the system, long-term energy production targets, etc. A configuration program
(Aurora Designer) which can aid correct dimensioning of a photovoltaic system is
available on the Power-One website (www.power-one.com).
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