DC Master DC/DC 24/12-12 Isolated Converter

An isolated DC-DC converter, such as the Mastervolt DC Master 24/12-12 (reference 81500300), has galvanic isolation between the input and output circuits. This means there is no direct electrical connection between the two. This isolation provides several advantages:

Additional protection against electric shocks and ground loops.Suppression of electromagnetic interference for sensitive equipment such as navigation instruments or radios.Compatibility with installations where the negative is not connected to ground.In contrast, a non-isolated model (such as the 81400300) has a direct electrical connection, making it more compact and less expensive, but it is best suited for installations where the negative is grounded.

With a nominal power of 164 W and a continuous current of 12 A (18 A peak for 2 minutes), this converter is ideal for powering 12 V equipment from a 24 V battery. You can use it for:

Navigation instruments (GPS, fishfinder, autopilot).Communication equipment (VHF, radio).Engine computers or battery management systems.LED lighting, pumps, or small electronic devices.Check that the total power of your devices does not exceed 164 W continuously for optimal operation.

Yes, absolutely. This Mastervolt DC Master 24/12-12 (isolated) converter is specifically designed for marine and leisure environments. It accepts a nominal input voltage of 24 V (operating range 20 to 32 V DC) and provides a stabilized 13.6 V output. Its IP53 protection rating shields it from water spray and dust, making it suitable for installation aboard a boat. It is also CE certified and carries the E marking (e11 020894, e13 023114), confirming compliance with safety standards.

The nominal output voltage of this DC Master 24/12-12 (isolated) converter is 13.6 V. This voltage is perfectly suited for powering equipment designed to run on a 12 V battery, as it compensates for voltage drops in the wiring and ensures stable power delivery. The output is stabilized, meaning it remains constant even if the input voltage varies within its normal range (20–32 V).

Installation is simple thanks to the provided mounting bracket. Follow these steps:

Choose a cool, dry, and well-ventilated location.Use the mounting bracket to mark the hole positions.Drill 3.5 mm holes and secure the bracket with the supplied screws.Snap the converter onto the bracket.Connect the input wires (24 V) first, respecting polarity, then the output wires (12 V).Install a fuse on the positive input cable near the battery.Ensure the power source is off during installation and no devices are connected to the batteries.

It is essential to install a fuse on the positive input cable (battery 24 V side), as close as possible to the battery. The fuse rating must match the maximum current the inverter can draw. For this 24/12-12 A model, a 20 A to 25 A fuse is typically recommended. Refer to the user manual for Mastervolt’s specified value. The fuse protects the wiring and inverter from short circuits or overloads.

Yes, this DC-DC converter is compatible with lithium batteries, provided the 24 V battery input voltage falls within the converter's operating range (20 to 32 V DC). Lithium batteries have a wider voltage range than lead-acid batteries, but they typically remain within this bracket. The converter will provide a stabilized 13.6 V output, which is ideal for powering 12 V equipment. No specific adjustment is required.

Idle consumption (when the converter is powered but no device is connected to the output) is very low, less than 15 mA (0.015 A). This feature is particularly useful for applications where the converter remains on permanently, as it minimizes discharge of the service battery. This is a strong point of the DC Master range.

The converter can supply a peak power of 245 W (18 A) for intervals of up to 2 minutes. Under continuous load, the nominal power is 164 W (12 A). This temporary overload capacity is useful for starting certain devices that require a higher inrush current at startup (such as a small compressor or pump).

The Mastervolt DC Master 24/12-12 (isolated) converter has the following dimensions:

Height: 167 mmWidth: 87 mmDepth: 50 mmIts weight is approximately 590 g (0.59 kg). These compact dimensions make it easy to install in confined spaces aboard a boat or vehicle.

Yes, absolutely. This DC-DC converter is perfectly suited for motorhomes, vans, or converted campervans equipped with a 24 V service battery. It allows stable and secure power supply to 12 V equipment (lighting, refrigerator, water pump, USB chargers, etc.). Its IP53 protection rating safeguards against dust and splashes, and its compact size makes it easy to integrate into an electrical panel.

The converter can operate within an ambient temperature range of -25 °C to 80 °C. However, above 30 °C, the output power decreases progressively (linear derating) to protect the electronic components. The storage temperature range is between -25 °C and 85 °C. It is recommended to install it in a cool, well-ventilated location to optimize its performance.

Yes, the DC Master converter includes electronic protections. It is protected against:

Output short circuits.Overloads (it can handle 18 A for 2 minutes, but will go into safety mode in case of prolonged overload).Reverse polarity (thanks to the external fuse to be installed on the input cable).These protections ensure the safety of your equipment and the converter itself.

No, this converter is designed to be powered by a 24 V battery or a stable DC power source between 20 and 32 V. A solar panel has a voltage that varies depending on sunlight and temperature, and it is not recommended to connect it directly to the converter. You must first connect the solar panel to a charge controller, which will charge the 24 V battery. The converter will then be connected to this battery.

The main difference lies in galvanic isolation:

Isolated model (81500300): It provides complete electrical isolation between the 24 V input and the 12 V output. This eliminates ground loops and electromagnetic interference, which is essential for sensitive equipment. It is also compatible with installations where the negative is not grounded.

Non-isolated model (81400300): There is a direct electrical connection between input and output. It is more compact, cheaper, and more efficient, but it is only suitable if the installation's negative is grounded.

For use with navigation instruments or radios, the isolated model is strongly recommended.

Yes, the kit is complete. All Mastervolt DC Master converters are supplied with:

A mounting bracket (mounting clip).Screws to secure the bracket.Faston terminals for electrical connections.You will only need the cables and the fuse to complete the installation.

No, this converter is not a battery charger. It is a DC-DC converter that provides a stabilized output voltage of 13.6 V. This voltage is suitable for powering 12 V equipment, but it is not designed to charge a battery (a battery charger follows a specific charging cycle with absorption and float voltages). You can use it to maintain a 12 V battery at a charge level, but not to fully charge it optimally.

Yes, this converter is compatible with a BMS (Battery Management System) as long as it behaves like a resistive load. As long as the input voltage supplied by the 24 V battery (managed by the BMS) remains within the 20 to 32 V range, the converter will operate normally. If the BMS disconnects the battery to protect it, the converter will simply stop. There is no communication conflict, as the converter has no specific communication protocol.