Mastervolt ChargeMaster 70A Fully Automatic Battery Charger #:  53101
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Mastervolt ChargeMaster 70A Fully Automatic Battery Charger

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12 Volt, 70 Amp 14.3 x 10.9 x 5.9 inches.
More Details...   #53101
Brand:  Mastervolt
MFG Part#:   44010700
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Mastervolt Chargemaster 70A Fully Automatic Battery Charger 44010700

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. 
Always on course with Mastervolt…

Mastervolt ensures you an electrical system with no weak links and a dependable and silent power supply. Whether for recreational or professional purposes, with Mastervolt you always have power you can rely on... The power to be independent.

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.

Specifications 12/70-3

General specifications 12/70-3  
Nom. output voltage

12 V

Total charge current

70 A

Number of battery outlets


Charge current second output

10 A

Charge current third output

10 A

Battery capacity range

140-700 Ah

Nom. input voltage

120/230 V (50/60 Hz)

AC connection

connector strips

Supplies your system without battery



LCD display

Dimensions, hxwxd

362x277x150 mm
14.3 x 10.9 x 5.9 inches


7 kg
15.4 pounds


with supplied mounting bracket or 4x screw for wall mounting or 4x screw for floor installation


CE, E-mark, ABYC A-31, SAE J1171/ISO 8846 ignition protected

Technical specifications  
Charge characteristic

IUoUo, automatic / 3-step+ for gel/AGM/wet/Lithium Ion

Charge voltage Bulk

14.4 V

Charge voltage Absorption

14.25 V

Absorption time

4 hours

Charge voltage Float (wet batteries)

13.25 V

Charge voltage Float (gel/AGM batteries)

13.8 V

Temperature compensation

-30 mV/ °C
-17 mV/ °F

Voltage compensation


Power consumption (DC side)

< 5 mA

Full load consumption (230 V AC)

1200 W

Current Control function

yes, through MasterBus

Power factor control

≥ 0.98

Temperature range (ambient temp.)

-25 °C to 60 °C, derating > 40 °C
-13 to 140 °F

Protection degree



vario fan

Sound level

< 52 dBA at 1 mtr


over temperature, over load, short circuit, high battery, low battery

MasterBus compatible


CSI/DC alarm

yes, using a Multipurpose Contact Output (code 77030500)

  Mastervolt ChargeMaster 12/70-3 Manual
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