Meet the Mastervolt ChargeMaster 24/12-3, a powerful 24V battery charger designed to keep multiple battery banks ready to go. With 12A total charging capacity spread across three equal outputs, it delivers fast, complete charging anywhere in the world while protecting your batteries with smart safety features and advanced charging technology.
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World-wide operation with auto-ranging input (90-265 V AC, 50/60 Hz) so you can plug in and charge wherever you are.
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3-step+ charging delivers fast and complete charging for gel, AGM, wet, and Lithium Ion batteries, using the IUoUo profile for optimal performance.
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Three equal charge outputs designed to charge multiple battery banks simultaneously, with a total charge current of 12A for reliable, balanced charging.
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MasterBus compatibility enables easy integration with other Mastervolt systems for central, local, or remote monitoring and control via a single cable (not available on some models).
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Protection and safety memory function prevents overcharging when mains supply is unstable, while automatic voltage compensation and built-in safety features ensure safe charging.
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Clear control panel and simple installation make setup quick and straightforward, so you can get back to boating, sailing, or RV adventures without fuss.
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Rugged, global-ready design with IP23 protection and a compact footprint (9.2 x 5.2 x 2.4 inches) built to withstand demanding environments.
Specifications at a glance
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Total charge current: 12A
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Number of battery outlets: 3
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Nominal output voltage: 24V
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Charge voltage (bulk/absorption/float): Bulk 28.8V, Absorption 28.5V (4 hours), Float 26.5V (wet); 27.6V for gel/AGM
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Battery capacity range: 24–120 Ah
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Nominal input: 120/230 V (90–265 V), 50/60 Hz AC
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Operating temperature: -25°C to 60°C (derates above 40°C)
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Protection: IP23, cooling via vario fan
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Dimensions: 9.2 x 5.2 x 2.4 inches
What’s in the box
- ChargeMaster 24/12-3
- DC wiring: 2 x positive (red) and 1 x negative (black)
- MasterBus terminating device
- Documentation
| 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 |
