Mastervolt Chargemaster 24/12-3
Mastervolt ChargeMaster 24/12-3 – High-Performance 24V Battery Charger
The Mastervolt ChargeMaster 24/12-3 delivers fast, efficient and reliable charging for 24-volt battery systems, making it ideal for marine applications, RVs and autonomous power installations. Featuring 3-stage+ smart charging, it ensures optimal performance and longer battery life across all battery technologies including AGM, Gel, flooded and Lithium-Ion.
Thanks to its autoranging input (90–265 V AC, 50/60 Hz), this charger operates worldwide even under fluctuating power conditions. The DC output remains active even without a battery connected, enabling essential onboard devices such as lighting or refrigeration to stay powered.
A backlit display shows key charging information at a glance, including voltage, current, charge stage and remaining capacity. Three control buttons allow direct system adjustment. The integrated MasterBus interface supports seamless system integration and both local and remote monitoring.
Designed for recreational and semi-professional use, this model features three simultaneous charging outputs, corrosion-resistant metal-to-metal terminals and comprehensive protection against overheating, overload, short circuit and improper voltage.
General Specifications
| Output voltage | 24 V |
| Total charge current | 12 A at 26.5 V |
| Battery outputs | 3 |
| Charge current output 2/3 | 12 A |
| Supported battery capacity | 24–120 Ah |
| Input voltage | 120/230 V (90–265 V), 50/60 Hz |
| AC connection | 2 m AC cable |
| Power supply function (without battery) | Yes |
| Galvanic isolation | Yes |
| Display | LED display |
| Dimensions | 234 × 132 × 60 mm |
| Weight | 1.8 kg |
| Certifications | CE, ABYC A-31, SAE J1171/ISO8846, RRR, RMRS |
Charging Specifications
| Charging profile | IUoUo 3-stage+ automatic |
| Bulk voltage | 28.8 V |
| Absorption voltage | 28.5 V (4 hours) |
| Float voltage | 26.5 V (flooded) / 27.6 V (Gel/AGM) |
| Temperature compensation | Yes |
| DC self-consumption | < 2 mA |
| Max AC consumption | 435 W |
| Power factor | ≥ 0.98 |
| Operating temperature | -25 °C to 60 °C |
| Cooling | Variable-speed fan |
| Protection | Over-temperature, overload, short-circuit, battery high/low voltage |
| Ingress protection | IP23 |
| MasterBus compatible | Yes |
