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DCI-300D
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Defort DCI-300D [7/28] Power inverter

Power Inverter

SAFETY INSTRUCTIONS

To ensure reliable service your power inverter must be

installed and used properly.

Read and understand the installation and operating

thoroughly prior to installation and use. Pay particular

attention to the WARNING and CAUTION statements

in this manual.

CAUTION statements advise against certain condi-

tions and practices that may result in damage to your

inverter.

WARNING statements identify the conditions or prac-

tices that may result in injury or death.

PLEASE READ ALL THE INSTRUCTIONS BEFORE

USING THIS POWER INVERTER.

WARNING:

To reduce this risk of ﬁ re, electric shock, explosion or

injury:

● Do not connect to AC distribution wiring.

● Always disconnect appliances from the inverter and

turn the inverter off before working the appliance.

Multiple outlet power strips with switches and power

switches and circuit breakers only interrupt power

to the “live” socket terminals. The neutral terminals

remain powered with respect to the earth terminals.

● Do not make any electrical connections or discon-

nections in areas designated as IGNITION PRO-

TECTED including DC cigarette lighter type plug

connections and ring terminal connections. Always

disconnect appliance from the inverter before re-

moving the inverter power source.

● Do not obstruct or block the air vents on the invert-

er.

● The inverter is not a toy, keeps away from children.

CAUTION:

● Do not use with positive earth electrical systems (the

majority of modern vehicles are negative earth). A

reverse polarity connection will result in a blown fuse

and may cause permanent damage to the inverter.

● The inverter will not operate high wattage applianc-

es or equipment that produces heat, such as dryers,

microwave ovens and toasters.

● Earthing the neutral will cause the inverter to shut

down.

● Do not operate the inverter if it is wet. Water and

electric do not mix.

● Do not install the inverter in the engine compart-

ment, the inverter must be used in a well ventilated

position.

● This inverter is not tested for use with medical equip-

ment.

IMPORTANT CABLE INFORMATION

Substantial power loss and reduced battery operating

time result from inverters installed with cables that are

not able to supply full power. Symptoms of low battery

power can result from cables that are either excessively

long or of an insufﬁ cient gauge. Marine installations are

subjected to vibration and stresses that exceed those

of other mobile installations, therefore the installer/op-

erator should be especially aware of the requirements

to maintain secure, tight water resistant electrical con-

nections and provide for strain relief for DC cables and

appliance wiring. Cable insulation must be the appro-

priate type for the environment.

INTRODUCTION

The inverter supplies continuous power in the form of

one household type socket. The inverter has enough

power to run almost any household or electronic appli-

ance. Safety features include automatic shut down and

a low battery alarm to prevent damage to your battery.

CONTROLS, INDICATORS AND CONNEC-

TORS

The front panel of the inverter provides two LED indica-

tors. The green LED indicator shows the unit is working

correctly when lit. The red LED indicator shows inverter

shut down from overload, over voltage or over temper-

ature. The inverter is ﬁ tted with an on/off switch, the on/

off switch is also used to force reset the inverter circuits

in case of overload, over voltage or over temperature.

Power is supplied through the three pin AC plug and

DC input power is supplied via the rear panel.

HOW INVERTERS WORK

Principle of operation

The inverter converts low voltage DC (direct current)

from a battery or other power source to standard AC

(alternating current) household power. The inverter

converts power in two stages. The ﬁ rst stage is a DC to

DC conversion process that raises low voltage DC from

the inverter input to high volt DC. The second stage is

the actual inverter stage that converts the high DC into

AC power.

The DC to DC converter stage uses modern high

frequency power conversion techniques that have re-

placed bulky transformers found in less technologically

advanced models. The inverter uses advanced MOS-

FET transistors in a full bridge conﬁ guration, which

ensures excellent overload capabilities and allows the

inverter to operate reactive loads such as small induc-

tion motors.

The output waveform

The AC output waveform is known as a “modiﬁ ed sine

wave”. It is a waveform that has characteristics similar

to the sine wave shape of standard household power.

This type of switching power is suitable for most AC

load, including linear and switching power supplies

used in electronic equipment, transformers and mo-

tors.

Defort DCI-300D [7/28] Power inverter

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