Mastervolt Mass 24/75 230V battery charger

The Mastervolt Mass 24/75 230V charger provides a nominal output voltage of 24 V and a total charge current of 75 A at 28.5 V.

This charger is compatible with a wide range of battery technologies, including Gel, AGM, Wet (flooded lead-acid) and Lithium Ion batteries.

The Mastervolt Mass 24/75 230V charger requires a nominal input voltage of 230 V. It can operate within an input voltage range of 180 to 265 V and a frequency of 50/60 Hz.

The charger uses an automatic IUoUo 3-stage charging characteristic, ensuring optimal and safe charging for batteries.

Default charge voltages at 25°C are as follows:

Bulk and Absorption: 28.5 VFloat for Wet batteries: 26.5 VFloat for Gel/AGM batteries: 27.6 V

The Mastervolt Mass 24/75 230V charger is suitable for battery banks with a recommended capacity of 150 to 750 Ah.

Yes, the charger is equipped with a second 3 A charge output. This is intended to provide a trickle charge to a secondary battery bank, such as a starting battery.

The charger features a lightweight housing made of stainless steel and anodized aluminum, giving it robustness and durability.

The charger must be installed in a well-ventilated area protected from rain, snow, splashes, steam, bilge water, humidity, and dust.

The charger operates within an ambient temperature range of 0 to 60°C (32 to 140°F). Power reduction (derating) is applied above 40°C (104°F) to maintain the internal heatsink temperature.

Yes, the charger is a MasterBus-compatible device. A green LED on the front panel indicates MasterBus communication.

Yes, if a battery isolator is used, a voltage drop of 0.6 V can occur. This drop can be compensated by enabling DIP switch 4 (Diode enabled) on the charger.

For Gel/AGM batteries requiring a higher Float voltage, you can increase the Float voltage to 27.6 V (for a 24 V charger) by setting DIP switch 3 to the 'on' position.

For installation, the following tools are recommended:

A 13 mm socket wrench to secure the DC input cables (battery).A Phillips screwdriver to open the charger's connection area.A 2 mm flathead screwdriver for the sense terminal.

The front panel of the charger has several LEDs to indicate its operating state:

LED 6: Green for normal operation, Red for a fault, Off for standby or shutdown. LED 7: Green for MasterBus communication, Off if no MasterBus communication. Numbered LEDs (1 to 5) and (9 to 13) indicate charge stages (BULK, ABSORPTION, FLOAT) and the percentage of charging current (0-5% to 75-100%).

In case of a fault, LED 6 lights up red, accompanied by other LEDs to indicate the nature of the issue:

LED 6 red + 1: Battery detection error.
LED 6 red + 2: Charger temperature too high.
LED 6 red + 3: Short-circuit indication (charger reduces charge current to 25%).
LED 6 red + 4: DC error (DC voltage too low or too high).
LED 6 red + 5: Temperature sensor error.

The absorption phase duration defaults to 4 hours, with a maximum of 6 hours and a minimum of 15 minutes.

Yes, the Contmon (Continuous Monitor) mode keeps MasterBus, RS232, and DC alarm functions operational during an AC power failure. The remote control also remains functional if it has its own power source.

Yes, a battery temperature sensor with cable and plug is included with the Mastervolt Mass 24/75 230V charger. It is recommended to use it for optimal temperature-compensated charging.