Iris Technology Operator's Manual
QuietPower 1800 (QP-1800) Doc 287.F701 / 100412
Page 25 of 56 Rev 12 APR 2010
Section 3
Operation
3.1 General
This section details how the unit functions as an inverter, provides information on the control
panel, describes operating limits, and provides performance data and system specifications.
3.2 Principles of Operation
The QuietPower Inverter converts DC power (24V) into 60 cycle 115VAC (utility power) power
from batteries and the vehicle electrical bus. This is done by the Inverter internally in two stages.
The first stage is a DC-to-DC converter, used to raise the low voltage DC input to high voltage
DC. The second stage is the actual inverter stage, taking the high voltage DC and converting it
to a precise, true sine wave AC output.
The DC-to-DC converter stage uses modern high frequency power conversion technology that
eliminates the bulky, low frequency (50/60 Hz) based transformers found in inverters using older
technology. The inverter stage uses advanced power semiconductors that provide excellent
overload capabilities.
3.3 Output Waveform
The AC output waveform of the QuietPower Inverter is a “true sine wave” with typically 1% Total
Harmonic Distortion (THD). Figure 7 illustrates the output waveform from the QuietPower
Inverter. This waveform is nearly identical to your utility-supplied power and in some cases
where utility power is poor, the QuietPower Inverter delivers cleaner, more precise AC power.
Figure 7: QuietPower Inverter True Sine Wave Output
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General