Projecta DC20 3 Stage Automatic DC to DC Battery Charger 12V 20A | Performance Shop

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This compact unit utilizes the vehicles power system which then delivers an intelligent 3 stage charge to an auxiliary battery.

Capable of stepping up from as low as 9V input up to 14.4V which makes it ideal for charging deep cycle batteries and secondary batteries in Caravans,4WDs and motorhomes.


The DC20 charger overcomes the problem of voltage drop associated with long cables commonlyused with auxiliary battery installations. By ‘stepping up’ the dropped voltage using switchmodecharging technology, the DC20 delivers a full three stage charge to your auxiliary battery.


Using the latest switchmode technology, the DC20 converts your vehicle’s 12VDC alternator powerup to 14.4VDC allowing your batteries to be fully charged, prolonging battery life and reliability.Switchmode charging uses electronic components allowing the charger to be lightweight andcompact without sacrificing on performance.


Using electronic control, the charger delivers 3 stage charging resulting in a faster and morepowerful charge, making it ideal for deep cycle batteries. The first stage, bulk (constant current),charges the battery faster while the second stage, absorption (constant voltage), ensures thebattery is thoroughly charged. The final stage, float, maintains the battery at a safe voltageallowing it to be maintained and ready for use indefinitely.


The DC20 can be wired to the vehicle’s ignition allowing it to operate only when the ignition isturned on. Alternatively you can connect the ignition and input terminals for continuous operation.


Spark-Free ProtectionPrevents the output leads from sparking due to accidental short circuit making the chargersafer to use around batteries.Reverse Connection ProtectionFuse protected to prevent damage to internal electronics in case of accidental reverse connection.Over and Under Voltage ProtectionThe charger will automatically shut down if there is an over voltage or under voltage problem.Over Temperature ProtectionThe charger will lower its output current if the temperature of the unit begins to overheat.


The battery charger side extrusions allow for quick and easy mounting for permanent installations.


The easy to read LED panel displays a range of information to ensure safe operation and to informyou of the battery status.

􀁳 Input: indicates if the input battery is correctly connected

􀁳 Output: indicates if the output battery is correctly connected.

􀁳 Fault: indicates internal damage requiring repair.

􀁳 Charging: illuminates when charging.

􀁳 Fully Charged: illuminates when fully charged.




FAQ\Trouble shooting

Q. Is the DC20 waterproof?

A. The Projecta DC20 is designed to be dust and shower proof. Normal use including rivercrossings and light engine washing will not pose any problem. Direct high pressure washing ofthe DC20 unit or submersion for a period of the time may cause some water damage and willnot be covered under warranty.

Q. Why do the positive cables from the batteries need to be fused?

A. 12V batteries can produce large amounts of power and are capable of melting cable insulationand catching fire in the case of a short circuit. Each positive (+) cable connected to the batterymust be protected by a fuse.

Q. Is the charger safe to use with modern ‘electronic’ vehicles?

A. The Projecta DC20 has been designed to work with all vehicles, especially new vehicles withEFI and computer management systems. The charger utilises sophisticated electronics thatensures complete safety for you and your vehicle.

Q. How do I know if the battery is charged?A. The ‘FULLY CHARGED’ LED will remain on. Alternatively use a Battery Hydrometer(Projecta Part No. BH100).

A reading of 1.250 or more in each cell indicates a fullycharged battery.

Q. I have connected the charger properly but the ‘INPUT LED’ does not come on?

A. The DC20 is designed to charge from a starter battery that has as little as 9V. If the voltage isbelow 9V, start the vehicle to allow the alternator to begin charging the battery or alternativelycharge the battery using a suitable battery charger.

Note: if the ignition connection is wired to the input positive terminal, and the starter batteryvoltage is below 10V, the unit will not operate. The ignition connection requires 10V beforeallowing the unit to start. Once in operation, the voltage to the ignition connection can fall aslow as 9V before it switches the unit off.

Q. I have connected the charger properly but the ‘OUTPUT LED’ does not come on?

A. 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 readinglight is left on for a week or more. The DC20 is designed to charge an auxiliary battery from aslittle as 5 Volts. If the voltage is lower than 5 Volts use a pair of booster cables to connectbetween two batteries to provide more than 5 Volts to the battery being charged. The DC20can then start to charge the battery and the booster cables can be removed.910Q. Why does the ‘FULLY CHARGED’ LED come on straight away?

A. There are three 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.

Q. What is Surface Charge?

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

Q. What is a Faulty Cell?

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

Q. Why is there no output at the charger’s terminals?

A. The charger incorporates short circuit protection that makes it much safer to use. For this reasonthe charger will only output power when properly connected to a battery. To check if the chargeris functioning, follow the instructions to connect and operate the charger as normal on a flatbattery. While the battery is charging measure the battery voltage with a volt or multi-meter.Charging can be confirmed if the voltage is increasing (within the voltage parameters set out inthe specifications).

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