Iris Technology Operator's Manual
QuietPower 1800 (QP-1800) Doc 287.F701 / 100412
Page 30 of 56 Rev 12 APR 2010
3.7 Performance Graphs and Specifications
3.7.1. Power Derating Curve
As with all inverters, the amount of continuous power that the QuietPower Inverters can deliver
without overheating is limited by ambient (surrounding air) temperature. The nominal
temperature for the power ratings specified for the QuietPower Inverters is 25° C (77° F). They
will operate and deliver their continuous power ratings at higher temperatures, but the extent to
which they can do this is limited by the ambient temperature as well as the input voltage from
battery. Figure 9 illustrates the relationship between power output and ambient temperature.
The rated power output of the QP-1800 Inverter is 1800W up to 25° C ( 77° F). Operating the
unit above this temperature will result in thermal shutdown or decreased performance. At input
voltages less than 24V, the unit runs warmer which will cause thermal shutdowns at
temperatures below these ambient temperature guidelines.
Operating the unit in conditions outside the power and temperature limits (“above” and “to-the-
right” of the derating curves) will result in thermal shutdown and/or significantly decreased
performance. In addition, operation in this range is outside of the ratings covered by the
product‟s regulatory approvals.
These curves are published for information purposes only to let you know what may happen
while operating in high ambient temperature conditions. Under normal battery voltage
conditions and non-extreme temperatures, inverter operation will be within the derating curve.
Under conditions of extreme low temperature -20° C (-4° F), the inverter may not start under full
load. Once started, however, the inverter will support a full load of 1800 W with no derating at -
20°C.
Figure 9: Output Power (W) Derating Curve
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