ChargeMaster Plus 12/75-3

ChargeMaster Plus is the next generation of battery chargers that integrates multiple functions into one single device. Replacing auxiliary chargers, battery isolators and VSR, ChargeMaster Plus reduces system complexity and cost. Designed for versatility, it charges virtually any combination of three batteries in a fast and safe way and works anywhere in the world.

Battery’s Best Friend

With the new Battery’s Best Friend architecture, ChargeMaster Plus is capable of charging a multitude of battery chemistries, sizes and voltages. All batteries are charged with the fast and safe 3-step+ charge method. Other unique features are:

  • Revival mode: automatically revives even fully depleted batteries.
  • Priority Charge: redirect available power to the lowest battery, for faster charging.
  • Smart Input: charge all three batteries from one single alternator for continuous charging on the go.

Global Charging

The ChargeMaster Plus handles worldwide AC voltages and frequencies. Resisting large voltage fluctuations and high temperatures, it keeps working in harsh environments. For marine and mobile markets, ChargeMaster Plus is CE, E-mark, ABYC, UL, SAE, CEC and RCM/C-Tick compliant.

System Simplicity

Nowadays, equipment must be self-explaining. The ChargeMaster Plus displays the charge phase of all three outputs in an understandable way. Robust and ergonomic connections save installation time. An integrated VSR eliminates the need for additional components and ensures that the alternators energy is funnelled through to the batteries.

Powerful Connections

In modern applications, all components work together. CAN-based MasterBus enables the charger to communicate with displays, shunts and power systems including communication standards like CZone®, NMEA and CANopen. The ChargeMaster Plus can operate as a power supply for delicate communication equipment, or during the construction phase of a boat.


  • Multicharger with two outputs, one in/output, DC-DC converter, current limiter and VSR.
  • Combine Lithium Ion, Gel or AGM, and large or small battery banks on a single battery charger.
  • Charges multiple batteries while being underway.
  • Extended specifications: offers 20 % more output at 14.4 V and 80 % charging power at 60 °C.
  • Safe Charge: quickly recognize the State of Charge for extended battery life.
  • Very wide operating range of 80-275 V AC, 35-70 Hz.
  • Compact, easy to connect and quick to install.


Product code: 44310750
download pdf


General specifications
Nominal output voltage (output 1 & 2) 12 V
Nominal output voltage (output 3) 12 V
Output current output 3 (current limited) 5-40 A at 12 V
Input current 'Smart Input' 40 A at 12 V
Max. AC current (230 V / 120 V) 6.5 A / 13 A
Total charge current 75 A at 14.4 V
Number of battery outlets 2 +1
Battery capacity range 320-800 Ah
Nominal input voltage 120/230 V (80-275 V), 50/60 Hz
AC connection screw terminals, suitable up to up to 6 mm²
Power supply mode yes
Display/read-out LED display
Dimensions, hxwxd 384 x 250 x 127 mm
15.1 x 9.8 x 5.0 inch
Weight 5.9 kg
13.0 lb
Approvals CE, ABYC, UL1236, SAE J1171, CEC, RCM/C-Tick
Technical specifications
Charge characteristic IUoUo, automatic / 3-step+ for Gel/AGM/Lithium Ion/traction/spiral
Temperature compensation -30 mV/°C / -17 mV/°F; temperature sensor included
DC voltage compensation through MasterShunt
Power consumption (DC side) < 2 mA (MasterBus off)
Current Control function yes, through MasterBus
Power factor control > 0.98
Temperature range (ambient temp.) -25 °C to 80 °C, derating > 40 °C
-13 °F to 176 °F
Cooling vario fan
Protection degree IP23, vertical mounting
Protections over-temperature, overload, short circuit, high/low battery voltage
MasterBus compatible yes
Charger Status Interface (alarm contact) yes, using a Multipurpose Contact Output (code 77030500)



ChargeMaster Plus 12/75-3

EU DoC Chargemaster Plus 12/75-3, 12/100-3, 24/40-3, 24/60-3


User manuals

ChargeMaster Plus 12/75-3

User's manual Chargemaster Plus 12/75-3, 12/100-3, 24/40-3, 24/60-3


3D product drawings

3D-drawing Chargemaster Plus 12/75-3, 12/100-3, 24/40-3, 24/60-3 (zipped STEP file)


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CM Plus + temp.sensor + MB

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CM Plus back

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CM Plus + mounting bracket

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CM Plus mounting bracket


ChargeMaster Plus


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