Bluewater Auto Charging Relay 12V - 140 AMP (Part Number 9800-7101-00)

Auto Charging Relay 12V - 140 AMP

The automatic charging relay (ACR) automatically manages battery charging to ensure maximum efficiency and protect your batteries.

Features:

• Automatic battery management connects batteries during charging and isolates them when the voltage drops


• Start Isolation (SI) protects sensitive electronics during engine cranking by temporarily disconnecting house loads (indicated by a slow-flashing yellow LED)


• High-output support compatible with alternators up to 120A


• Dual-color LEDs provide real-time battery status: Fault, Charging, Discharging, Combine, SI, and Override modes


• Under Voltage Lockout prevents the relay from closing when battery voltage is too low (9.5V for 12V systems, 19V for 24V systems)


• Durable design IP67 waterproof, ignition protected, safe for marine and RV applications

Specifications:

• Continuous Rating: 120 Amps


• Intermittent Rating: 140 Amps


• Max Voltage: 48VDC


• Cable Size: 4/0 AWG

Applications:

• Boats dual battery systems (starter + house)


• Sailboats navigation and lighting batteries


• Fishing boats trolling motor and accessory battery protection

The Bluewater Auto Charging Relay (ACR) 12V - 140 AMP is designed for efficient battery management in a variety of marine and RV applications. This relay automatically manages the connection between batteries during charging cycles, ensuring optimal power distribution while protecting sensitive electronics. Its intelligent design isolates batteries when voltage drops, preventing deep discharge and potential damage to your system. The relay's robust construction makes it suitable for demanding environments, including watercraft and recreational vehicles, with an IP67 waterproof rating that ensures durability against moisture and water exposure. The high-output support capability allows compatibility with alternators up to 120A, making it versatile for different power setups.

Equipped with dual-color LEDs, the relay provides real-time status updates such as Fault, Charging, Discharging, Combine, Start Isolation (SI), and Override modes, allowing users to monitor system health easily. The Start Isolation feature temporarily disconnects house loads during engine start, safeguarding sensitive electronics from voltage surges, indicated by a slow-flashing yellow LED. An under voltage lockout prevents the relay from engaging when battery voltage falls below safe thresholds—9.5V for 12V systems and 19V for 24V systems—adding an extra layer of protection. The relay supports continuous operation at 120 amps and intermittent peaks up to 140 amps, with a maximum voltage of 48VDC.

This relay is ideal for dual battery systems on boats, sailboats, and fishing vessels, managing starter and house batteries efficiently. It is also suitable for navigation and lighting batteries on sailboats, as well as trolling motor and accessory battery protection on fishing boats. Its durable, waterproof design ensures reliable performance in harsh marine environments. Installation requires 4/0 AWG cable, making it suitable for high-current applications. Overall, the Bluewater Auto Charging Relay 12V - 140 AMP offers a combination of smart battery management and rugged construction, making it an essential component for maintaining optimal power systems in marine and RV setups.

Features:

• Automatic battery management connects batteries during charging and isolates them when the voltage drops

• Start Isolation (SI) protects sensitive electronics during engine cranking by temporarily disconnecting house loads

• High-output support compatible with alternators up to 120A

• Dual-color LEDs provide real-time battery status: Fault, Charging, Discharging, Combine, SI, and Override modes

• Under Voltage Lockout prevents the relay from closing when battery voltage is too low (9.5V for 12V systems, 19V for 24V systems)

• Durable design with IP67 waterproof rating, ignition protected, safe for marine and RV applications