2000W 12V Modified Sine Wave Inverter

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WHY DOES THE INVERTER TURN ITSELF OFF?

If the inverter makes a beep sound and/or the “RED” fault light illuminates this indicates that there is a problem, and the inverter will usually turn off. Most commonly this would be caused by an appliance that is drawing too much power (overloading), low battery voltage or voltage drop due to insufficient size cables or poor connections (see section on protection features, page 11).

THE INVERTER WILL NOT RUN MY APPLIANCE EVEN THOUGH THE APPLIANCE DRAWS LESS POWER (WATTS) THAN THE SIZE OF THE INVERTER?

Electrical appliances can be divided into three groups by the way they draw energy (current) from their power supply. These groups are “Resistive”, “Inductive” and “Capacitive” appliances or also called “loads”. Some appliances may draw all three types of power.

• Resistive Loads such as normal incandescent lights (wire filament) always draw a constant power (watts) from the power supply, that is a 100 Watt light will draw approximately 100 Watts from the power supply at all times. Resistive loads are the easiest appliances for an inverter to run.
• Inductive Loads such as a refrigerator (Electric Motor) require a large rush of power (surge current) to start and then usually draw a more constant power once running. Inductive loads contain coils of wire (motors, transformers, ballasts, solenoids). When the power is first turned on these coils of wire draw a large surge current which forms the magnetic flux (magnetic field) which allows these appliances to work. This magnetic flux is a kind of stored energy.
– The most common inductive appliances are: fridges, air compressors, transformers/chargers, pumps, power tools and fluorescent lights. These appliances can draw 2 – 6 times their normal running power to start up, that is to run a 190 Watt fridge you may need a 600 or 1000 Watt inverter.
• Capacitive Loads such as many TV’s or many electronic appliances require a large surge current to start only when they have not been used for a while. This is often due to large capacitors in the power supply that must be quickly charged when the appliance is turned on. If the appliance is not used for a few days these capacitors slowly go flat. Resetting the inverter a couple of times may allow these appliances to work.
• There are some appliances such as large refrigerators, air conditioners and other pump driven appliances that have extremely high start up currents, because they have an inductive motor that must start under load. These appliances are not recommended for use with an inverter. They should be powered by an engine driven generator.

THE INVERTER IS POWERING MY PORTABLE TELEVISION, BUT I CANNOT GET A CLEAR PICTURE?

In poor reception areas it is quite common to have some interference on a portable TV (such as faint lines on the screen) when operating on all modified sine wave inverters.

To improve your picture quality:
• Keep the inverter as far away from the TV as possible.
• Use an external long range or fringe area TV antenna with good quality coaxial cable.
• Earth (Chassis GND) the inverter (see section on earthing, page 10).

CAN I RUN FLUORESCENT LIGHTING FROM MY INVERTER?

Most portable fluorescent work lamps should operate fine on an inverter even though they may be slow to start.

• Fluorescent lights are an inductive & capacitive load and often draw at least twice as much power from the inverter than their normal rating to start.
• Normal household fluorescent lights should be avoided, because they contain power factor correction capacitors. Power factor correction is used in normal buildings to help smooth out the inductive effects of fluorescent light ballasts. If used with portable power inverters the power factor correction is effected by the harmonic distortion in the modified waveform, this causes a high load on the inverter that can overload the unit. If normal household fluorescent lights must be used, you will need to have a qualified electrician remove the power factor correction capacitor. The light should then be marked “For Inverter Use only”.

WHY DOES IT DAMAGE THE INVERTER IF THE BATTERY LEADS ARE CONNECTED BACK TO FRONT?

Your inverter uses sophisticated electronics to convert DC battery power to AC mains power. If you accidentally connect the inverter to the battery incorrectly (reverse polarity) a large current will be drawn by the inverter which will blow the protection fuses, as this occurs some of the high current could damage sensitive electronic components. Because of this risk it is important to always double-check the battery polarity before making any connections.

HOW DO I CHECK OR CHANGE THE FUSES?

The IMW300 inverter is fitted with one external fuse holder. If the unit does not function, disconnect the inverter from the DC power source and disconnect any AC appliances. Remove the black fuse caps, then remove the fuses and check if they are blown. Replace blown fuses with the spares provided or standard automotive blade fuses of the correct rating. The IMW600, IMW1000 & IMW2000 contain internal fuses, these should only be checked or replaced by a qualified electrical appliance repairer.

THE DC SUPPLY MUST BE DISCONNECTED BEFORE ANY REPAIR, THEN TURN THE ON/OFF SWITCH OF THE INVERTER “ON” TO DISCHARGE THE CAPACITORS.

WHY DO LIGHTS OPERATING FROM THE INVERTER START DIM AND THEN GET BRIGHTER?

Projecta inverters feature “Peak Power Technology”. This feature allows the inverter to ramp up its voltage output. This gradual increase in power allows appliances to operate with a “Soft-Start” ensuring superior operation and helps the inverter to power inductive loads.

WHY DOES THE FAN ONLY OPERATE SOMETIMES ON IMW600, IMW1000 & IMW2000 INVERTERS?

These inverters feature a temperature controlled automatic cooling fan that only operates when needed. This allows the inverter to run very quiet for most of the time.

WHY DOES MY RESIDUAL CURRENT DEVICE (RCD) TRIP EACH TIME I TURN AN APPLIANCE ON?

Some RCD’s disconnect (trip) when they do not receive any power. These types of RCD’s can be tripped by the inverter’s Peak Power Technology which allows a gradual ramp up of power. Use a continuous RCD which does not trip out when the power is turned off, these only trip when there is a fault.

WHY DO SOME POWER TOOLS NOT WORK PROPERLY?

Some newer power tools use PWM variable speed controllers to vary the tool’s speed as the trigger is squeezed. These power tools switch the power on and off very quickly in a similar way to how the inverter works. Because of this, some may not function properly with the inverter’s modified sine wave output.

CAN I RUN LAPTOP COMPUTERS?

Most laptop/notebook computer AC power adapters work perfectly fine with the inverter’s modified sine wave. Some however are more sensitive and may not function properly. If your power adaptor does not function or causes a humming noise it is probably not compatible.

CAN I CONNECT LIGHTS WITH DIMMERS TO THE INVERTER?

Older light dimmers may function fine but most newer light dimming circuits are designed for household sine wave AC power, these may not work properly with modified sine wave inverters.

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