Mastervolt Mass 24/50-2 Automatic Battery Charger User Manual

1. Introduction

This manual provides essential instructions for the safe and efficient operation, installation, and maintenance of your Mastervolt Mass 24/50-2 Automatic Battery Charger. The Mastervolt Mass series is engineered for robust performance in professional, semi-professional, and recreational environments, ensuring a reliable power supply under various conditions. Please read this manual thoroughly before installation and use.

2. Safety Information

Important Safety Instructions:

• Always read and understand all instructions before installing or operating the charger.
• Installation must be performed by qualified personnel in accordance with all applicable electrical codes and standards.
• Ensure adequate ventilation around the charger to prevent overheating.
• Do not operate the charger near flammable materials or in areas where explosive gases may accumulate.
• Disconnect all power sources before performing any maintenance or making connections.
• Avoid contact with battery acid and wear appropriate personal protective equipment.
• This charger is designed for specific battery types and voltages. Verify compatibility before connecting.

3. Product Overview

The Mastervolt Mass 24/50-2 is an automatic battery charger known for its reliability and long operational lifespan. It incorporates Mastervolt's "Green by Heart" program, which focuses on efficient energy use and faster battery charging, even with limited input current. The unit is designed for easy integration and replacement due to consistent dimensions and connections across product generations.

Figure 1: Mastervolt Mass 24/50-2 Automatic Battery Charger. The front panel features a teal-colored section with LED indicators for battery charge status (5% to 100%, float, absorption, bulk) and an on/off switch. The main body is silver-grey with cooling fins on the sides. The model name 'MASS 24/50' and 'AUTOMATIC BATTERY CHARGER' are visible on the lower front, along with the Mastervolt logo and 'with battery & temperature sense'.

3.1. Control Panel Indicators

The front panel provides visual feedback on the charger's status and battery charge level:

• Charge Level LEDs: Indicators for 5%, 25%, 50%, 75%, and 100% battery charge.
• Charging Phase LEDs:
  • Bulk: Initial charging phase, delivering maximum current.
  • Abs (Absorption): Battery is nearly full, voltage is held constant while current decreases.
  • Float: Battery is fully charged, maintaining a constant voltage to compensate for self-discharge.
• On/Off Switch: Controls the power to the charger.
• Charger Status LED: Indicates if the charger is active.

4. Setup and Installation

Proper installation is crucial for the safe and optimal performance of the Mastervolt Mass 24/50-2. It is strongly recommended that installation be carried out by a certified marine electrician or qualified professional.

4.1. Mounting

• Select a dry, well-ventilated location, protected from direct sunlight, excessive heat, and moisture.
• Ensure sufficient clearance around the unit for cooling airflow, especially around the cooling fins.
• Mount the charger securely using appropriate fasteners for the mounting surface.

4.2. Electrical Connections

• AC Input: Connect the charger to a stable 240 Volt AC power source. Ensure the wiring gauge is appropriate for the current draw and circuit protection is in place.
• DC Output: Connect the DC output terminals to your battery bank. Observe correct polarity (+ to + and - to -). Use heavy-gauge cables suitable for the charger's output current.
• Temperature Sensor: Connect the optional battery temperature sensor (if supplied) to the designated port and attach it to the battery. This optimizes charging by adjusting voltage based on battery temperature.
• Grounding: Ensure the charger chassis is properly grounded according to local regulations.

5. Operating Instructions

The Mastervolt Mass 24/50-2 is designed for automatic operation once properly installed and connected.

1. Power On: Ensure all connections are secure. Flip the on/off switch on the front panel to the 'on' position. The 'charger' status LED should illuminate.
2. Charging Process: The charger will automatically detect the battery's state of charge and initiate the appropriate charging phase (Bulk, Absorption, Float). Monitor the charge level and phase LEDs on the front panel.
3. Power Off: To stop charging, flip the on/off switch to the 'off' position.

The charger will automatically maintain the battery bank at optimal levels once fully charged, entering the float phase to prevent overcharging.

6. Maintenance

The Mastervolt Mass 24/50-2 is designed for minimal maintenance. Regular checks can help ensure its longevity and performance.

• Visual Inspection: Periodically inspect all cables and connections for signs of wear, corrosion, or damage. Ensure they are tight and secure.
• Ventilation: Ensure that the cooling fins and ventilation openings are free from dust, dirt, or obstructions. Clean gently with a soft, dry cloth if necessary.
• Environment: Keep the charger's environment clean, dry, and within specified operating temperatures.
• Internal Maintenance: There are no user-serviceable parts inside the charger. Do not open the casing. Refer all internal servicing to qualified Mastervolt service technicians.

7. Troubleshooting

If you encounter issues with your Mastervolt Mass 24/50-2, consider the following basic troubleshooting steps:

• Charger Not Turning On:
  • Check the AC input power supply and circuit breaker.
  • Ensure the on/off switch on the front panel is in the 'on' position.
• No Charging Output:
  • Verify that the DC output cables are correctly connected to the battery bank and polarity is correct.
  • Check for any blown fuses in the DC output circuit (if applicable).
  • Ensure the battery voltage is within the charger's operating range.
• Overheating:
  • Ensure adequate ventilation around the charger. Clear any obstructions from the cooling fins.
  • Verify ambient temperature is within specified limits.

For persistent issues or complex problems, contact Mastervolt customer support or a qualified service technician.

8. Specifications