The Mastervolt ChargeMaster 24/12-3 is a versatile 24V battery charger designed for boats, RVs, and remote installations. It features three equal outputs and smart safety features to keep multiple battery banks ready, no matter where you are in the world.
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Three equal outputs: Three independent outputs designed to charge multiple battery banks simultaneously, delivering a combined 12A of charging current.
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Nominal output voltage: 24V
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World-wide operation: Auto-ranging input (90–265 V AC, 50/60 Hz) for use anywhere
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Charge characteristic: IUoUo, automatic 3-step+ charging for gel, AGM, wet, and Lithium Ion batteries
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Battery capacity range: 24–120 Ah
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Charge voltages: Bulk 28.8V; Absorption 28.5V (4 hours); Float 26.5V (wet) or 27.6V (gel/AGM)
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Voltage compensation: Automatic
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MasterBus compatibility: Easy integration with other Mastervolt systems for central, local, or remote monitoring and control
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Protection and safety features: Safety memory function to prevent overcharging during unstable mains supply, plus built-in safety features
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Display/read-out: LED display
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Protection rating: IP23 enclosure for rugged, global-ready use
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Cooling: Vario fan
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Dimensions: Compact footprint — 9.2 x 5.2 x 2.4 inches
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AC connection: Includes 2 m AC cable
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Operating temperature: -25°C to 60°C with derating above 40°C
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Power consumption (DC side): < 2 mA
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Full load power (230 V AC): 435W
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Number of battery outlets: 3
This charger helps you keep multiple battery banks safe and ready, whether you’re on the water or off-grid. MasterBus compatibility enables seamless monitoring and control within a larger Mastervolt system, while worldwide input compatibility and automatic voltage compensation adapt to varied power sources. Its robust IP23 enclosure and efficient vario cooling ensure reliable performance in demanding environments.
| General Specifications |
| Total charge current |
12A |
| Number of battery outlets |
3 |
| Nominal output voltage |
24V |
| Charge current second output |
12A |
| Charge current third output |
12A |
| Battery capacity range |
24-120aH |
| Nominal input voltage |
120/230 V (90-265 V), 50/60 Hz |
| AC connection |
2 mtr AC cable |
| Power supply mode |
yes |
| Display/read-out |
LED display |
| Technical specifications |
| Charge characteristic |
IUoUo, automatic 3-step+ for gel/AGM/wet/Lithium Ion |
| Charge voltage Bulk |
28.8V |
| Charge voltage Absorption |
28.5V |
| Absorption time |
4 hours |
| Charge voltage Float (wet batteries) |
26.5V |
| Charge voltage Float (gel/AGM batteries) |
27.6V |
| Voltage compensation |
Automatic |
| Power consumption (DC side) |
< 2 mA |
| Full load consumption (230 V AC) |
435W |
| Current Control function |
No |
| Temperature range (ambient temp.) |
-25 °C to 60 °C, derating > 40 °C
-13 °F to 140 °F |
| Protection degree |
IP23 |
| Cooling |
vario fan |
| MasterBus compatible |
Yes |
| Dimensions |
9.2 x 5.2 x 2.4 inch |
