Iris Technology Operator's Manual
QuietPower 1800 (QP-1800) Doc 287.F701 / 100412
Page 28 of 56 Rev 12 APR 2010
3.6 Inverter Operating Limits and Protection Features
Power Output: The QuietPower 1800 delivers 1800 watts continuously. Table 2 displays the
continuous and peak current ratings as well as surge rating.
Table 2: Operating Limitations
Continuous AC Output
Current Rating
Peak AC Output
Current Rating
Surge Rating (Max. Watts
Delivered for 5 Seconds)
The QuietPower Inverter will be able to operate all AC loads rated at or below these power
ratings. Some high horsepower induction motors used in pumps and other motor-operated
equipment require very high surge currents to start and the QuietPower Inverter battery
combination may have difficulty starting these loads. If you have problems with certain loads,
ensure that battery connections are solid, your DC wires are appropriately sized, and that the
battery is of sufficient capacity and fully charged. It may be necessary to operate the vehicle
(possibly continuously) and to power the inverter from the alternator.
Input Voltage: The QuietPower Inverter operates from an input voltage ranging from 20 to 32
VDC.
Peak performance for these inverters occurs when DC input voltage is in the range of 24 volts to
30 volts for 24V models. The QuietPower Inverter will indicate high and low DC voltage
conditions as shown in Table 3.
Table 3: System Trip Voltages
DC Input
Over Voltage
Alarm
DC Input
Over Voltage
Shut-down
DC Input
Under Voltage
Alarm
DC Input
Under Voltage
Shut-down
The over-voltage protection and shutdown protects the inverter against excessive input voltage,
should the unit be connected to a higher voltage than it is designed for (up to 35 VDC - higher
voltages may cause damage). Low input voltage shutdown protects your battery from being
over-discharged. The QuietPower Inverter requires a manual reset to re-start after shutdown
from either high or low input voltage. Turn the power switch to „O‟ and then back to „I‟ to re-start
the unit.
Output Overload Protection: A short circuit may be applied to the output continuously without
damage to any internal components. The QuietPower Inverter will shutdown in less than five
seconds when the output falls 10% below the nominal voltage as a result of current limiting.
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