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Digital Duo Charge

Installation/Operation

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Introduction

The Digital Duo Charge provides a safe, intelligent alternative for the care of your vessel’s engine starting battery. Unlike 
switches, isolators and other charge splitting devices, the Duo Charge is mounted between the vessel’s house and starting 
batteries rather than between the alternator and batteries. This allows the alternator and regulator to concentrate output 
based on the house battery’s needs. When the Duo Charge senses charging voltage at the house battery, it works like a DC-
to-DC battery charger, providing up to 30 amps of regulated charging current to support the starting battery.
In most installations, the Duo Charge requires just four wires for operation; a fused input wire, a fused output wire, a ground 
wire and an ON/OFF wire. In applications where the Duo Charge is used to supply a battery bank that may require more 
than 30 amps of regulated charging current, the Duo Charge may be used to 

manually 

control an external solenoid. Please 

note the section in the manual relating to solenoid control.
The  Duo  Charge  is  designed  specifically  to  enable  its  user  to  control  charging  voltage  output  --  making  it  possible  to 
safely mix house and starting battery technologies. The Duo Charge features four different programs based on four bat-
tery technologies: Standard Flooded, Deep Cycle Flooded, Gel and AGM battery types. In addition, the Duo Charge can be 
programmed for 12-volt or 24-volt operation. When used with an optional Battery Temperature Sensor cable (MC-TS-B), the 
Duo Charge has the ability to respond to a battery over-temperature condition by automatically discontinuing charging 
output.

Safety Considerations

Before installing your Duo Charge, please take a moment to consider these guidelines for safe regulator installation. Failure 
to work safely could result in injury or damage to your electrical system.

1.  Always disconnect your battery banks and ensure that switches are “OFF” prior to installing your regulator.
2.  Remove loose-fitting clothing or jewelry, which could become entangled in your motor or other machinery.
3.  Wear ANSI-approved safety glasses.
4.  DO NOT attempt to modify the Duo Charge. Alterations could result in damage to your charging system, and will void 

your warranty.

5.  Do not attempt installation if tired or fatigued.
6.  Ensure the engine has cooled before initiating installation.
7.  Do not attempt installation while using alcohol or medication that could impair your judgment or reaction time.
8.  Always use the right tool for the job. Improper tool use may damage regulator or your boat, and could result in per-

sonal injury.

9.  Take time to read the manual. Equipment damage and possible injuries may result from an incomplete understand-

ing of the installation and operation of the Duo Charge. If you are unfamiliar with DC electrical systems, consult with a 
licensed marine electrician. 

© Revised June, 2008

Contents

Introduction ............................................................................ 1
Safety Considerations ............................................................ 1
Unpacking The Box ................................................................ 2
Installation Basics ................................................................... 2
Wiring Basics/Ground Wire/Output Wire ........................... 2
Input Wire/ON-OFF Wire/Optional Connections .............. 3
Battery Temperature Sensor/Solenoid Drive .................... 4

Duo Charge Operation .........................................................5
Programming Duo Charge/System Voltage .....................6
Programming For Battery Type ...........................................6
Troubleshooting ....................................................................7
Duo Charge Wiring Diagram ...............................................7
Duo Charge Terminal Location Legend .............................8
Balmar Contact Information ................................................8

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Содержание Digital Duo Charge

Страница 1: ...y to respond to a battery over temperature condition by automatically discontinuing charging output Safety Considerations Before installing your Duo Charge please take a moment to consider these guide...

Страница 2: ...ions are required Ground Wire The Duo Charge must be properly connected to system ground which must be shared between the house and starting bat tery banks for proper operation Failure to do so will r...

Страница 3: ...ge threshold the Duo Charge will provide charging current to the starting battery When used in this mode the Duo Charge will require a nominal amount of current while asleep approximately 500mA If the...

Страница 4: ...wn while checking periodically to see if demand has diminished If your application requires frequent charging levels in excess of 30 amps it may be necessary to add a solenoid as a method to manually...

Страница 5: ...e is 30 amps and if the demand is greater than 30 amps the Duo Charge will go into an over current condition shut down and try again During the over current condition the Duo Charge will not put out a...

Страница 6: ...couple of seconds the 3 green LED will illuminate Continue to hold the magnet to the switch After another couple of seconds the 3 green and 5 green will both be illuminated Remove the magnet from the...

Страница 7: ...able Check wiring resistance and repair as needed 2 Voltage drop in input cable Check wiring resistance and repair as needed 3 Voltage drop in output cable Check wiring resistance and repair as needed...

Страница 8: ...bypass the internal circuitry and sup ply a negative source to a solenoid relay via the Duo Charge s So lenoid Drive 9 This option is used in cases where larger battery banks such as thruster or wind...

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