Automatic charge relay ML-ACR Lithium with manual control 24 V 500 A

The Blue Sea Systems ML-ACR Lithium automatic charge relay is designed to intelligently manage the charging of your marine batteries, particularly 24 V lithium batteries. It automatically connects or isolates battery banks based on system requirements and voltage thresholds, optimizing their charging cycle and protection.

This automatic charge relay is designed to operate with 24 V electrical systems.

The ML-ACR Lithium automatic charge relay has a nominal capacity of 500 A, making it suitable for installations requiring robust current management.

No, this relay is specifically designed to be compatible with lithium batteries (LiFePO4). Its voltage algorithms and thresholds are optimized for the charge and discharge characteristics of this battery type.

The built-in manual control allows you to directly manage the relay state. You can use it to manually connect or isolate battery banks as needed, for example during system maintenance or an emergency situation.

ML-ACR stands for "Magnetic Latch - Automatic Charging Relay". The "Magnetic Latch" technology allows the relay to hold its position (connected or isolated) without consuming power, except during state changes. This ensures very low current consumption.

The ML-ACR Lithium relay optimizes the charging cycle and battery protection by managing their connection and isolation. It helps prevent excessive discharge of a battery bank by isolating loads when voltage is low, and ensures proper charging by connecting banks when a charging source is available. However, it does not replace a Battery Management System (BMS) that provides comprehensive protection against overcharging, deep discharge, and cell balancing.

Yes, Blue Sea Systems ML-ACR series relays are generally designed to be ignition-protected, making them safe for use in boat engine compartments where flammable vapors may be present. This feature is essential for marine safety.

This relay connects battery banks (e.g., a starter bank and a service bank) when the voltage of one reaches a predefined charge threshold, allowing the alternator to charge both banks. It then isolates them when the voltage drops below a disconnect threshold, preventing the starter bank from discharging the service bank (or vice versa), while being optimized for lithium battery characteristics.

For installation, it is crucial to use cables with the appropriate cross-section to handle the 500 A current and to ensure all connections are clean and secure. Properly sized fuses or circuit breakers must be installed on the power circuits to protect the system and the relay. It is recommended to consult the installation manual provided by Blue Sea Systems for specific wiring diagrams.

The ML-ACR relay is designed to be surface-mounted. While it can generally be installed in various orientations, it is always best to refer to the Blue Sea Systems installation manual for any specific recommendations regarding optimal orientation for heat dissipation and protection against the elements.

Lithium batteries have different voltage and charging characteristics from lead-acid batteries. A relay specifically designed for lithium, such as the ML-ACR Lithium, uses adapted voltage thresholds to optimize charging and discharging of these batteries, thereby extending their lifespan and ensuring safe and efficient operation.

Although this relay is optimized for lithium batteries, using it in a hybrid system (lithium and lead-acid) can be complex and requires a thorough understanding of each battery type's characteristics and the relay's voltage thresholds. It is generally recommended to use relays or charge management systems suited to each battery type to avoid undercharging or overcharging issues. Consulting a marine electrical systems expert is advised for such configurations.

Blue Sea Systems products for the marine environment are generally designed to withstand moisture and water spray. The ML-ACR is often rated IP66, meaning it is protected against powerful water jets. However, it is still recommended to install it in a location protected from direct immersion and heavy spray where possible.

The ML-ACR relay is typically equipped with a visual indicator (often an LED) and/or a manual control switch that shows its current state (connected, isolated, or automatic mode). The state is also visible via the position of the manual switch if one is used.

The ML-ACR Lithium relay is powered by the 24 V battery system it manages. It uses a very low amount of current for its internal operation and to change state thanks to its magnetic latching technology.

The ML-ACR Lithium can be configured to prioritize charging the starter bank or to isolate the service bank during engine start. This function, called "Start Isolation" or "Start Priority", protects sensitive equipment on the service bank from significant voltage drops during startup. It is important to check the specific configuration options in the product manual.

The specific physical dimensions are not provided in the product context. For precise information on dimensions and weight, it is recommended to consult the official technical datasheet for product 7623300-BSS on the Blue Sea Systems website or the installation manual.

By intelligently managing the connection and isolation of battery banks, the ML-ACR Lithium relay ensures batteries are charged optimally and are not subjected to unnecessary deep discharges from other banks. It keeps banks isolated when voltage is low, preventing excessive discharge of one bank by another, which is crucial for preserving the health and lifespan of lithium batteries.