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Mastervolt ChargeMaster Plus 24V / 40A - 3 Banks Marine Battery Charger - 44320400

The Mastervolt ChargeMaster Plus 24/40-3 is the next generation of battery charger 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 a maximum of three batteries in a fast and safe way and works anywhere in the world. Nominal output voltage: 24 V, Total charge current: 40 Amp, Number of battery outlets: 3  Battery capacity range: 160-400 Ah, Nominal input voltage: 120/230 V (80-275 V), 50/60 Hz.
Part Number: Mastervolt 44320400         

Replaced by Chargemaster Plus CZone 24/40-3 - 44320405

Reference: 44320400
Reg Price: $839.99
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Mastervolt ChargeMaster Plus 24/40-3 Marine Battery Charger - 3 Banks

With the new Battery’s Best Friend architecture, the 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.

Global Charging

The Mastervolt 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 24/40 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.

Mastervolt Chargemaster Plus 24/40-3

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.

Features of the Chargemaster Plus:

  • Revival mode: automatically revives even fully depleted batteries.
  • Multi voltage: charge 12V starter battery in a 24V system, without additional components.
  • 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
  • Compact, easy to connect and quick to install.
  • Multicharger with two outputs, one in/output, DC-DC converter, current limiter and VSR.
  • Charges multiple batteries while being underway.

Technical Specifications

General specifications: Mastervolt ChargeMaster Plus 24/40-3, 44320400
Nominal output voltage (output 1 & 2) 24V
Nominal output voltage (output 3) 24V / 12V
Output current output 3 (current limited) 5-20 A at 2 V / 10 A at 12V
Input current 'Smart Input' 20 A at 24V
Max. AC current (230 V / 120 V) 6.8 A / 13.5 A
Total charge current 40 A at 28.8 V
Number of battery outlets 3
Battery capacity range 160-400 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: Mastervolt ChargeMaster Plus 24/40, Mastervolt 44320400
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 < 0 °C and > 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 (product code 77030500)


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