ChargeMaster 24/12-3

The Mastervolt ChargeMaster 24/12-3 is a fully automatic battery charger designed for marine and mobile environments. It is intended to efficiently and safely recharge 24V battery banks using an advanced 3-stage+ charging algorithm.

The ChargeMaster 24/12-3 has dimensions of 234 x 132 x 60 mm (HxWxD). Its weight is 1.8 kg.

Yes, even when batteries are not connected, the ChargeMaster 24/12-3 can provide a constant DC output, allowing you to power equipment such as lighting or refrigeration directly.

Mastervolt's 3-stage+ charging algorithm operates in three automatic phases:

BULK: The charger delivers its maximum current for a fast charge from 0 to 80% of the battery's capacity.

ABSORPTION: The charger reaches its maximum charging voltage and the charging current slowly decreases until the battery is fully charged to 100%.

FLOAT: This stage begins once the battery is fully charged. The battery remains in a fully charged state, compensating for self-discharge.

The ChargeMaster 24/12-3 has an IP23 protection rating. This means it is protected against solid objects larger than 12.5 mm and against rain falling at an angle up to 60° from the vertical.

No, the ChargeMaster 24/12-3 has no on/off switch. To shut it down, you must cut the AC power. Charging will resume as soon as AC power is restored.

The ChargeMaster 24/12-3's bright LED screen displays essential data, including charging current, charging voltage, charging stage, and battery level (or available capacity percentage in Ah). It also indicates the MasterBus network communication status.

The ChargeMaster 24/12-3 is compatible with a wide range of battery technologies, including lead-acid batteries (flooded), AGM, Spiral, Gel, deep-cycle batteries, and Mastervolt lithium-ion batteries (MLi).

Yes, the ChargeMaster 24/12-3 is compatible with the MasterBus network. This enables decentralized communication between the various Mastervolt system devices, as well as remote control and monitoring.

For Mastervolt gel batteries (MVG series), the minimum recommended capacity for the ChargeMaster 24/12-3 is 25 Ah. Always follow the battery manufacturer's instructions.

The ChargeMaster 24/12-3 is designed for indoor use only. It should preferably be mounted on a vertical wall, with the connection cables pointing downward. Ensure at least 10 cm of free space around the device for proper airflow and avoid placing it in the same compartment as the batteries or directly above them due to corrosive fumes.

For maximum system efficiency, DC cables should be as short as possible. The minimum recommended cross-section for battery cables up to 3 meters (9 feet) in length is 4 mm² (10 AWG) for each of the three outputs. Use ring terminals on the battery side and cable ends on the charger side, crimped with an appropriate tool.

The recommended DC fuses for each of the three outputs of the ChargeMaster 24/12-3 are 15A. The positive battery cable must be equipped with a fuse and connected to the positive terminal of the battery bank.

Yes, for a secure installation, it is necessary to insert a residual current device (RCD) in the ChargeMaster 24/12-3’s AC input circuit. The ground wire provides protection only if the ChargeMaster’s housing is connected to the safety ground.

In addition to the ChargeMaster itself, the delivery typically includes:

A battery temperature sensor with cable and plug.DC wiring: 2 positive cables (red) and 1 negative cable (black).A MasterBus termination device.The user manual.Important safety instructions.

Installation must be carried out by a certified electrician. All electrical systems (AC and DC) must be disconnected from any power source during installation. It is crucial to avoid short circuits or reverse polarity, as this can seriously damage the batteries, the ChargeMaster, the wiring, and accessories.

The warranty of the ChargeMaster 24/12-3 may be voided if modifications are made that do not comply with the guidelines, instructions, and specifications in the user manual. Mastervolt guarantees that the unit was built to applicable standards, but any deviation from the instructions may cause damage or failure to meet specifications, thereby voiding the warranty.

Yes, the ChargeMaster 24/12-3 features temperature compensation. By installing the included battery temperature sensor, charging voltages are automatically adjusted to ambient temperatures. This prevents overcharging or excessive gassing, thereby extending battery life.