ChargeMaster 12/35-3

Product Highlights

Power you can rely on.


  • 3-Step+ charging technology for fast and complete charging. 
  • Safe and complete charging due to standard safety features.
  • Memory function prevents overcharging in case of an unstable power supply. 
  • Clear control panel.
  • Easy to install.
  • Built-in system functionality (MasterBus) in combination with other Mastervolt products.


ChargeMaster battery chargers

Make the most of your batteries with the ChargeMaster, plugging in and charging anywhere in the world. Mastervolt’s ChargeMaster guarantees fast and complete charging of your batteries no matter where you are. The ChargeMaster can charge multiple battery banks simultaneously thanks to its combined functionality. Moreover, all ChargeMasters can be easily connected to a MasterBus network with only one cable and one connection. You also have the option of central, local or remote monitoring, configuration and control of your system. The ChargeMaster is available in various models to guarantee you the ideal battery charger for any situation and demand.

Charging your batteries with every voltage

The Mastervolt ChargeMaster supplies a maximum capacity wherever you are via auto-ranging. Auto-ranging ensures perfect fully automatic operation anywhere in the world, regardless of the available mains voltage (90-265 V AC, 50 or 60 Hz). The 3-step+ charging technology guarantees fast and complete charging, while the cos phi 1 regulation gets the most out of limited generator capacity.

Sturdy connections

Metal-on-metal fitting gives a firm connection, and prevents corrosion or overheating of contact surfaces.

Charging multiple battery banks

The ChargeMaster series has three equal charge outputs. Those of the smaller ChargeMaster models are pre-installed with two metres of cable for a plug & play solution, while the heavier models have one full output (for example for your service battery) and two outputs of 10 A, ideal for your starter batteries.


General specifications

Nominal output voltage12 V
Total charge current35 A
Number of battery outlets3
Charge current second output35 A
Charge current third output35 A
Battery capacity range70-350 Ah
Nominal input voltage120/230 V (90-265 V), 50/60 Hz
AC connectionconnector strips
Supplies your system without batteryyes
Display/read-outLED Display
Dimensions, hxwxd291 x 210 x 131 mm
Weight4 kg
Fasteningwith supplied mounting bracket or 4x screw for wall mounting or 4x screw for floor installation
ApprovalsCE, ABYC A-31, SAE J1171/ISO8846 ignition protected

Technical specifications

Charge characteristicIUoUo, automatic 3-step+ for gel/AGM/wet/Lithium Ion
Charge voltage Bulk14,4 V
Charge voltage Absorption14,25 V
Absorption time4 hours
Charge voltage Float (wet batteries)13,25 V
Charge voltage Float (gel/AGM batteries)13,8 V
Temperature compensation-30 mV/ °C
Voltage compensationautomatic
Power consumption (DC side)< 5 mA
Full load consumption (230 V AC)575 W
Current Control functionyes, through MasterBus
Power factor control≥ 0,98
Temperature range (ambient temp.)-25 °C bis 60 °C, derating > 40 °C
Sound level< 52 dBA at 1 mtr
Protection degreeIP23
CSI/DC alarmyes, using a Multipurpose Contact Output
Protectionsover temperature, over load, short circuit, high/low battery voltage
MasterBus compatibleyes

Product Order