Vector MAXX SST VEC054D User Manual download pdf (Page 9)

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

• Household appliances

• Dry and/or wet/dry vacuums

• Heavy duty power tools & chargers

• Sump pumps, motors and other electric-powered equipment

Most electrical tools, appliances and audio/video equipment have labels that show

the unit’s power consumption in amps, watts, or both. To avoid inverter shutdown and

possible damage to the inverter, avoid exceeding the wattage rating of this unit. To

obtain a rough estimate of the current (in amperes) the power source must deliver

where the power consumption of the tool or device is given in watts AC, simply divide

the power consumption of the load by 10.

Example: If a load is rated at 200 watts AC, the power source must be able to deliver:

200 divided by 10 = 20 amperes.

The inverter has built-in overload protection so that if you do exceed the inverter’s

output capacity continuously, the unit will automatically shut down. Once the

excessive load is removed, the inverter can be restarted and resume normal

operation.

Note:

To restart the inverter, turn it OFF, and then ON again. The ON/OFF Switch is

located on the unit’s Front Panel (see page 2).

The inverter powers resistive loads the easiest; however, larger resistive loads, such

as electric stoves or heaters, could draw more wattage than the inverter can deliver

on a continuous basis.

CAUTIONS

Ensure that total continuous power consumption of all tools and/or

appliances connected to the inverter (and in use) does not exceed the

inverter’s continuous watts rating. Also ensure that start-up wattage

for inductive loads does not exceed peak watts for more than a

second.

Appliances such as microwave ovens will normally draw more than

their rated current and could possibly overload the inverter when

operating simultaneously with other appliances. For example: A 600

watt microwave oven draws approximately 940 watts.

PRINCIPLE OF OPERATION

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.

It converts power in two stages (see the diagram below). In the first stage, the inverter

raises the 12 volt DC input to 145 volts DC. This MAXX SST

™

inverter uses high-

frequency conversion techniques that replace bulky and heavy transformers found in

older inverters. In the second (output) stage, the inverter converts the 145 volt DC to

110/120 volt AC using multiple banks of metal-oxide semiconductor field-effect

transistors (MOSFETs). The unit’s solid-state circuitry ensures excellent overload

protection and the ability to operate reactive loads such as those found in inductive

motors. In this stage, the inverter functions as a high-power bipolar switch, alternately

applying opposite polarity to the AC outlet HOT and NEUTRAL terminals.

Notes:

Simplified diagram.

Cables, fuse and battery are not included and must be supplied by user.

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

SINE WAVE

MODIFIED

SINE WAVE

12 VOLT DC

INPUT FROM

BATTERY

AWG

WIRE

AWG

WIRE

AWG

WIRE

+ –

–

ANL

FUSE

(external)

TERMINAL

BLOCK

DC TO DC

CONVERTER

INTERNAL WARNINGS &

PROTECTION CIRCUITS

VOLT, AMP METERS*

OVER TEMP &

VOLT INDICATORS

ON/OFF

SWITCH

145 VDC

MOSFET

BIPOLAR

SWITCH

BANKS

NEUTRAL HOT

(2, 3 OR 4)

OUTLETS

GROUND

SENSE

FAULT

See Specifications on

page 16 for wire

gauges and fuse

amperages.

VEC049_thru_56D_Manual_092205 10/21/05 11:50 AM Page 4

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Vector MAXX SST VEC054D User Manual Page 9

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