Automatic charge relay ML-ACR Lithium 12 V 500 A

The BLUE SEA ML-ACR Lithium 12 V 500 A automatic charge relay is a device designed for advanced management of marine charging systems. It is specifically suited for 12 V lithium battery banks and enables automatic interconnection and isolation of starting and service batteries, ensuring efficient and secure charging.

The ML-ACR detects the voltage of each battery bank. When one of the batteries is being charged (for example, by the alternator or a charger), the relay automatically connects the banks to allow simultaneous charging of all batteries. When charging stops and the voltage drops, it disconnects the banks to isolate the starter battery, ensuring it remains fully charged for engine start.

The primary function of this relay is to optimize the charging of service and starter batteries in a marine system equipped with 12V lithium batteries. It ensures the starter battery is always ready for use while enabling efficient and safe charging of the service batteries, thus protecting the entire electrical system.

The "500 A" rating indicates the relay’s rated direct current capacity. This means it is designed to handle high current flows, which is critical for demanding marine electrical installations and high-capacity battery banks.

This model is specifically designed for 12V lithium batteries, as these have different charging and discharging characteristics from traditional lead-acid batteries. The ML-ACR Lithium is calibrated with optimized voltage thresholds for lithium batteries, ensuring proper charge management and protection against overcharging or improper discharging, which maximizes their performance and lifespan.

Yes, by intelligently managing load distribution and isolating battery banks when necessary, the relay helps protect systems from potential overloads and extends battery life by maintaining optimal charging conditions.

No, the ML-ACR operates entirely automatically. It detects and manages the connection and disconnection of battery banks without requiring any manual intervention from the user.

Benefits include:

No voltage drop: Unlike diode-based splitters, the ML-ACR does not induce voltage drop, enabling more efficient and complete battery charging.Flexibility: It provides more dynamic and intelligent battery bank management.Simplicity: Its automatic operation simplifies onboard power management.

Yes, the ML-ACR relay is designed for the marine environment. It is generally robust, resistant to water spray (often rated IP66) and protected against ignition, making it suitable for installation in engine compartments or other areas exposed to moisture.

Yes, the ML-ACR relay typically includes a remote control option or a manual switch that allows forcing the connection or disconnection of battery banks, or setting it to automatic mode. This provides flexibility for specific needs or emergencies.

This specific model, the ML-ACR Lithium, is optimized for 12V lithium batteries. While it can technically operate with other battery types (lead-acid, AGM, Gel), its voltage thresholds are specifically calibrated for lithium battery charging characteristics to maximize performance and lifespan. For other battery types, it is recommended to use an ACR model specifically designed for them.

No, this model is specifically designed for 12 V electrical systems, as indicated by its "12 V" designation. Use in a 24 V system is not recommended and could damage the device or the entire electrical system.

Yes, the ML-ACR is generally compatible with most standard marine alternators. It detects the charging voltage from the alternator to activate the connection of battery banks and distribute the charge.

Yes, the ML-ACR is designed to detect any charging source that increases the voltage on one of the battery banks. Whether it's an alternator, a shore power charger, or solar panels, the relay will connect the banks accordingly to distribute the charge efficiently.

Its 500 A capacity makes it suitable for a wide range of marine applications. It can be used on mid-sized recreational boats up to larger yachts, provided the boat’s electrical system uses 12 V lithium batteries and the total electrical consumption matches the relay’s capacity.

Installing an automatic charge relay involves high-current electrical connections and requires a solid understanding of marine electrical systems. Although instructions are provided, it is strongly recommended to use a qualified marine electrician if you lack proven experience in marine electrical work to ensure a safe and code-compliant installation.

Installation requires high-gauge battery cables, suitable for the 500 A relay capacity, to connect battery banks to each other and to the relay. The exact cable gauge depends on cable length and the maximum current in your system, in accordance with manufacturer recommendations and marine electrical standards.

Yes, it is essential to install appropriate fuses or circuit breakers on the positive lines of each battery bank connected to the relay. This is critical to protect the system against short circuits and overcurrents, in accordance with the manufacturer's recommendations and marine safety standards.

The relay must be installed in a dry, well-ventilated, and easily accessible location. It must be protected from direct water splashes, excessive humidity, and extreme heat. It is recommended to mount it near the batteries it manages to minimize the length of heavy-gauge cables and reduce voltage losses.

Yes, a detailed installation manual is usually provided with the ML-ACR automatic charge relay. The manual includes wiring diagrams and step-by-step instructions to guide users through the installation and configuration process.