3.2 THE MAXX SST 400 WATT OUTPUT WAVEFORM
The AC output waveform of the MAXX 400 SST is known as “modified sine
wave”. It is a waveform that has characteristics similar to the sine wave
shape of utility power. This type of waveform is suitable for most AC loads,
including linear and switching power supplies used in electronic
equipment, transformers, and motors.
The modified sine wave produced by the MAXX 400 SST inverter has an
RMS (root mean square) voltage of 110 volts, which is the same as
standard household power. Most AC voltmeters (both digital and analog)
a
r
e
sensitive to the average value of the waveform rather than the RMS value.
They are calibrated for RMS voltage under the assumption that the waveform
measured will be a pure sine wave. These meters will not read the RMS
voltage of a modified sine wave correctly. They will read about 20 to 30 volts
low when measuring the output of the inverter. For accurate measurement of
the output voltage of this unit, use a true RMS reading voltmeter such as a
Fluke 87, Fluke 8060A, Fluke 77/99 series, Beckman 4410, or Triplett
4200.
FIGURE 4
- Modified Sine Wave and Sine Wave Comparison
4.
INSTALLATION
4.1 POWER SOURCE REQUIREMENTS
The power source must provide between 10.5 and 15.5 volts DC and must
be able to supply the necessary current to operate the load. The power
source may be a battery or a well-regulated DC power supply. To obtain a
rough estimate of the current (in amperes) the power source must deliver,
simply divide the power consumption of the load (in watts AC) by 10.
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