6/12/24V Automatic & Manual 21 Amp 2 Stage Battery Charger

MULTI-VOLTAGE OPERATION

Adjustable to suit 6, 12 or 24 Volt operation

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HOW DO I KNOW IF THE BATTERY IS CHARGED?

The battery charger’s GREEN ‘FULLY CHARGED’ LED will illuminate to indicate when the battery is fully charged. Alternatively use a Battery Hydrometer (Projecta Part No. BH100). A reading of 1.250 or more in each cell indicates a fully charged battery.

WHY DOES THE BATTERY CHARGER HAVE TWO RATINGS?

Battery chargers for automotive use have traditionally been given an RMS rating in the past. This rating is now used as an industry reference only. Australian Standards now require all battery chargers to be rated at the charger’s continuous output at a nominated voltage. We express this as mA (milliamps) rather than A (Amps) to avoid confusion.

WHY DOES THE ‘FULLY CHARGED’ LED COME ON STRAIGHT AWAY?

There are four possible reasons why the ‘FULLY CHARGED’ LED may come on straight away:
1. The battery is fully charged.
2. The battery has taken a surface charge.
3. The battery has a faulty cell.
4. The BATTERY VOLTAGE setting on the charger is set lower than the battery voltage.

WHAT IS SURFACE CHARGE?

Batteries unused or left flat for some time build up a resistance to being recharged. When the charger is first connected, these batteries will take a surface charge, and the ‘FULLY CHARGED’ LED will illuminate within a short while. The battery however is not fully charged, the charger is voltage sensitive and cannot differentiate between a surface charge and a fully charged battery. After a few hours the battery may start to accept some charge but most batteries with this condition will not recover.

WHAT IS A FAULTY CELL?

12 Volt batteries contain 6 cells and one faulty cell is enough to ruin your battery. If after eight hours of charging your battery is still flat, you should test the cells using a hydrometer. If one reading is lower than the rest it indicates a faulty cell. It is pointless to continue charging, as the battery needs replacing.

I HAVE CONNECTED THE CHARGER PROPERLY BUT THE ‘ORANGE’ CHARGING LIGHT DOES NOT COME ON?

In some cases batteries can be flattened to the point where they have very little or no voltage. This can occur if a small amount of power is used for a long time, for example a map reading light is left on for a week or more. Projecta automatic chargers are designed to charge from as little as 3 Volts. If the voltage is lower than 3.0V press the override button to start the charger.

CAN I USE THE CHARGER AS A POWER SUPPLY?

Projecta automatic chargers are designed to only supply power to the battery clips when they are correctly connected to a battery. This is to prevent sparks or damage to the charger or battery if connected incorrectly by mistake. This safety feature prevents the charger from being used as a ‘Power Supply’. No voltage will be present at the clips.

IN MAINTENANCE MODE WHY DOES THE CURRENT GO HIGH THEN LOW AGAIN?

While in maintenance mode it is normal for the current to go high and then low. The charger is maintaining the battery voltage between the Cut-In and Cut-Out voltages. The pulses of power are topping up the battery to maintain it fully charged.

WHAT ARE VOLTS AND AMPS?

VOLTS
The term voltage refers to the electrical force or electric potential to do work between two terminals or a good analogy is water pressure in a pipe. For example a battery has 12 Volts between the positive and negative terminals, or a 6 Volt battery has 6 Volts between the positive and negative terminals.

AMPS
The term AMPS is the unit of measure used for current, which can be described as the flow of electric charge in a circuit. Again if you use the water analogy this would refer to how much water is flowing through the pipe. For example if the current is reading 12 Amps then this is the amount of energy going into the battery.

HOW DOES A TYPICAL BATTERY CHARGE?

A typical flat battery has a low internal resistance. When first connected to a charger the battery will accept a high current. As the battery slowly charges, the voltage and internal resistance will rise causing the battery to accept less and less current.

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