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Mastervolt

42020506

Mass 24/50-2 Charger

The Mastervolt Mass 24/50-2 battery charger delivers automatic 24V charging at 50A, specifically designed for intensive professional use, offering superior durability compared to the ChargeMaster consumer range. Equipped with two outputs (50A main and 3A secondary) and MasterBus compatibility, it ensures seamless network integration for complex energy systems. The product is supplied with a temperature probe (6m cable) and a MasterBus terminator.

Price excl. import taxesBenefit from the professional rate

£891.20 GBP

£891.20 GBP ~~£1,069.47 GBP~~

Shipping calculated at checkout.

Prices exclude import taxes (indicative rate: UK import VAT 20%). DAP delivery: import taxes are paid on delivery.

Available in stock

Free pickup point from €150 in France
Pickup at Skysat possible

Custom installation

Trust Skysat to install the equipment on board

Request a quote

Installers near you

thanks to our network of approved installers

Find an installer

Support service

Opt for additional installation assistance

Technical specifications

Recommended AC cable cross-section	2.5
AC input voltage range	195 to 265 V
Battery temperature sensor included	Oui
Bulk/absorption charge voltage	28.8
Charge algorithm	3-step+
Charge phases	Bulk, Absorption, Float, Maintenance
Continuous power at 25°C	1200.0
Continuous output power (40°C)	960.0
Cooling method	Natural convection
Dimensions (W x H x D)	365 x 245 x 130
Max efficiency	92.0
Float voltage	27.6
Galvanic isolation	Oui
Input voltage range	195 to 265
Inverter waveform	Not applicable
IP rating	IP23
Marine-ready	Oui
Maximum AC input current	6.0
Max charge current (A)	50.0
Minimum DC cable cross-section	16.0
Mounting type	Vertical wall mount
Nominal input voltage	230.0
Nominal output voltage	24.0
Nominal voltage	24.0
Operating temperature range	0 to 60
Output frequency	0
Output voltage	24.0
Overload protection	Oui
Peak power	1200.0
Power factor (Cos Phi)	0.9
Recommended fuse rating	20.0
Remote on/off support	Oui
Short-circuit protection	Oui
Supported battery chemistries	Flooded lead-acid, Gel, AGM, Lithium-ion
Weight	4.6
Wired input	Screw terminal block
Wired network	MasterBus (RJ12)
Wired output	Screw terminal block

Detailed description

The Mastervolt Mass 24/50-2 battery charger is designed for the most demanding marine and mobile environments. Delivering a 50A charging current at 24V, this model features a three-stage automatic charging process (3-step+) that ensures fast and secure recharging of your battery banks. Unlike the ChargeMaster range, which is more suited to standard recreational installations, the Mass series is built for intensive and professional use, offering superior robustness with its C2-type housing and IP23 protection rating.

Performance and system integration

This charger has two outputs: a 50A main output for the service battery bank and a 3A secondary output dedicated to maintaining the starter battery. It is fully compatible with the MasterBus network, enabling centralized configuration, monitoring, and control from a compatible display. Supplied with a 6-meter temperature probe for thermal compensation, it ensures optimal battery life for lead-acid, gel, AGM, or lithium-ion batteries. Installation requires vertical mounting in a ventilated space, with secure connections in a dedicated compartment accessible only to qualified installers.

Reliability and safety

Built with industrial-grade components, the Mass 24/50-2 charger weighs 4.6 kg and operates on a 230V AC power supply (50-60Hz). It includes advanced protections against short circuits, polarity reversal, and overheating, with automatic power reduction above 40°C ambient to protect internal electronics. Compared to equivalent competitors such as Victron Energy’s Centaur series, Mastervolt’s Mass model stands out for its native MasterBus connectivity and its ability to maintain high-precision charging even during significant fluctuations in the electrical grid or generator output.

Documentation

Type	Nom
	FR - Manuel utilisateur - Chargeur Mass 24/50-2
	EN - Manuel d'utilisation et d'installation - Chargeur Mass 24/50-2

Expert opinion

Pol CONIN

Digital Manager

« The industrial standard for 24V charging in marine environments »

The Mastervolt Mass 24/50-2 charger is a true benchmark for onboard electrical installations requiring industrial-grade reliability. In the field, its rugged housing and power electronics enable it to withstand the most demanding engine-room environments, though it must be mounted away from direct spray (IP23). The 3-step+ algorithmic charge management, paired with the supplied temperature probe, ensures a perfect charge curve—a critical factor for preserving large-capacity battery banks. Native integration with the MasterBus network greatly simplifies the setup and monitoring of the entire energy system. The inclusion of a secondary 3A output is a strategic advantage for keeping the engine-start battery on float charge without requiring an additional distribution module.

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Mass 24/50-2 Charger

£891.20 GBP

£891.20 GBP ~~£1,069.47 GBP~~

Frequently Asked Questions

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What is the Mastervolt Mass 24/50-2 charger?

The Mass 24/50-2 from Mastervolt is a professional battery charger designed for the most demanding marine and mobile environments. It delivers a charging current of 50A at a voltage of 24V and uses a three-stage automatic charging process to ensure fast and safe recharging of your battery banks.

How many outputs does this charger have?

This model has two separate outputs:

A primary 50A output dedicated to charging the house battery bank. A secondary 3A output specifically for maintaining the starter battery.

Which types of batteries are compatible with this charger?

The Mass 24/50-2 charger is highly versatile. It is fully compatible with the following battery technologies:

Flooded lead-acidClassic gelAGMLithium-ion

What is the IP rating of this model?

This charger has an IP23 protection rating. This means it is protected against solid objects larger than 12.5 mm and against rainwater at angles up to 60° from the vertical, making it suitable for indoor mounting in a marine environment.

How should the Mass 24/50-2 charger be installed?

Installation must meet several criteria for optimal operation:

It must be mounted vertically with the connection cables facing downward. The space must be well-ventilated and protected from excessive moisture. It must never be installed directly above batteries to avoid corrosive gas emissions.

Is the charger supplied with a temperature sensor?

Yes, the charger is supplied as standard with a temperature sensor fitted with a 6-metre cable. This sensor automatically adjusts the charging voltage based on battery temperature, which optimises battery lifespan.

Is this charger compatible with the MasterBus network?

Yes, it is fully compatible with the MasterBus communication network. This allows you to configure, monitor, and control the charger centrally from a compatible display. A MasterBus terminator is also included in the box.

What is the required supply voltage for this device?

The charger operates on a standard 230V alternating current (AC) power supply, with a frequency between 50 and 60 Hz.

What happens if the ambient temperature in the engine room is very high?

The charger features advanced thermal protection. If the ambient temperature exceeds 40°C, the device automatically reduces its charging power (derating) to protect its internal electronic components and prevent overheating.

Can the charger be installed in the same compartment as the batteries?

No, it is strongly advised not to install the charger in the same enclosed compartment as the batteries. Lead-acid batteries generate potentially explosive and corrosive gases during charging, which could damage the charger's electronics.

What is the weight of this Mastervolt charger?

The charger alone has a net weight of 4.6 kg. With its full packaging, the total weight is approximately 6.8 kg.

How much clearance should be left around the device during installation?

To ensure sufficient airflow and proper cooling, it is essential to leave a clearance of at least 10 cm all around the charger.

How to check the charging phase of the device?

The front panel of the charger is fitted with LED indicators. These lights allow you to monitor the device’s operating status and the current charging stage (Bulk, Absorption, Float) in real time.

What is the 3-step+ charging process?

The 3-step+ process is an automatic charging algorithm developed by Mastervolt. It comprises three main phases:

Bulk: Fast charge at maximum current.
Absorption: Full charge at constant voltage.
Float: Maintenance voltage to keep the battery at 100% without damaging it.

Who should carry out the installation of this charger?

The charger is designed to be permanently connected to AC and DC electrical systems. Installation and wiring must be carried out by a qualified technician or electrician, in compliance with local regulations.

Is the charger noisy during operation?

The charger uses an active ventilation system to cool its internal components. The fan may produce a slight noise when operating at full power, but its speed automatically adjusts to the device's cooling needs.

Is an earth connection required for this charger?

Yes, it is mandatory for safety reasons. The charger must be connected to an earth conductor via the dedicated terminal on the AC input to prevent any risk of electric shock.