Power Derating - Power One AURORA PVI-3.8-I-OUTD Manuel D'utilisation Et D'installation

Installation and operating manual
(PVI-3.8/4.6-I-OUTD Rev.: 1.5)
8.4

Power Derating

In order to ensure inverter operation in safe thermal and electrical conditions, the unit
automatically reduces power input to the grid.
Power derating may occur in two cases:
Reduction in power due to environmental conditions
The degree of power reduction, and the temperature at which it starts occurring, also
depend, besides ambient temperature, on many operating parameters, including, for
example, input voltage, grid voltage, and power available from the photovoltaic field.
AURORA, therefore, can reduce power during certain periods of the days according to
the value of these parameters.
However, AURORA guarantees maximum power up to an ambient temperature of
50°C for PVI-4.6-I-OUTD, and of 60°C for PVI-3.8-I-OUTD, provided that it is not
exposed to direct solar radiation.
Reduction in power due to input voltage
The chart shows the automatic reduction in power output when input or output voltage
is too high or too low.
5000
4000
3000
2000
1000
0
50 150
Figure 28 – Derating curve compared to input voltage - Use of both channels
Power Derating (parallel channels)
250 350
Vin (V)
450 550
Page 94 of 95
PVI-4.6 full power + 10%
PVI-4.6 full power
PVI-3.8 full power + 10%
PVI-3.8 full power