Principle of Operation

90548011 VEC054D INVERTER.qxp 3/6/09 10:41 AM Page 4

The inverter contains automated features that will reset and re-start its operation after overload and thermal shutdown without action by the user.

WARNING: TO REDUCE THE RISK OF INJURY OR PROPERTY DAMAGE: If the appliance does not work or stops working, unexpectly, or even momentarily, turn off the appliance and disconnect from inverter until the cause is identified and corrected.

The MAXX SST™ inverter converts 12 volt DC (direct current) from a vehicle battery or other 12 volt DC power source to standard 120 volt AC (alternating current) household power.

The Power Inverter Output Waveform

The AC output waveform of the Power Inverter 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 Power Inverter has an RMS (root mean square) voltage of 115 volts, which is the same as standard household power. Most AC voltmeters (both digital and analog) are 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 179, Fluke 79 III series, Beckman 4410 or Triplett 4200.

Modified Sine Wave and Sine Wave Comparison

Incompatible Products:

CAUTION: Certain products contain power supplies or circuits that are not compatible with an inverter using a modified sine wave output (such as this inverter) and may be damaged by using this inverter.

If your product requires pure sine wave AC input power to function properly, the instruction manual for your product could state this. If in doubt, you should contact your product manufacturer PRIOR TO USE.

Some products must be powered from a pure sine wave power source, such as standard household power, or a "pure sine wave" inverter in order to function properly.

Your product could be damaged by this inverter if it contains:

1.Transformer type power supplies

2.Microprocessor controlled power supplies

3.Capacitive coupled power supplies

If an incompatible product is used with this inverter:

•The product might not operate at all, with no indication of failure. The product fuse might have opened as a result of trying to use it with the inverter.

•The product exhibits unusual operation (such as, intermittent operation, buzzing, and the like.)

WARNING: If the product does not operate normally, to reduce the risk of injury or property damage:

• Turn the product off immediately and unplug it from the inverter.

APPLIANCE POWER CONSUMPTION

MAXX SST™ inverters are ideal for powering:

•Lights

•TVs and TV/DVD (VCR) combinations units

•Radio receivers/transceivers and stereo systems

•Computers and peripheral equipment

•Refrigerator/freezers

•Small microwave ovens