Blue Sea Systems SI-ACR Automatic Charging Relay, 120A 12/24V

Optimize your vessel's electrical management with the Blue Sea Systems SI-ACR Automatic Charging Relay. This intelligent device automatically combines your battery banks during charging cycles and isolates them when discharging or starting engines, ensuring reliable power where and when you need it. Designed for demanding marine and vehicle applications, it actively protects sensitive electronics from voltage fluctuations during engine cranking. Invest in smart power distribution and ensure reliable power on your vessel.

Key Features & Benefits:

• Automatic Battery Management: Effortlessly combines batteries for charging and isolates them for discharge or engine starting, optimizing battery health and system efficiency.
• Start Isolation (SI) Technology: Temporarily isolates house loads from the engine circuit during cranking, safeguarding sensitive electronics from voltage sags and spikes.
• High-Output Alternator Support: Rated for high-output alternators up to 120 Amperes continuous (210A intermittent) for robust performance.
• Dual Sensing Design: Automatically senses charging sources on either battery bank, ensuring efficient charging from alternators, shore power chargers, or solar panels.
• Auto-Ranging Voltage: Designed for universal compatibility with both 12V and 24V DC systems.
• Waterproof & Ignition Protected: IP67 rated for temporary immersion (30 minutes) and meets ISO 8846, UL 1500, and SAE J1171 external ignition protection requirements, making it safe for installation aboard gasoline-powered boats in wet environments.
• Under Voltage Lockout: Prevents automatic connection to a severely discharged or potentially defective battery bank (below 9.5V for 12V systems or 19V for 24V systems).
• Hermetically Sealed Contacts: Provides a vapor-proof design for enhanced durability and reliability in harsh conditions.
• Corrosion-Resistant Studs: Features large, tin-plated copper studs for maximum conductivity and resistance to marine corrosion.
• Remote Monitoring Capability: Includes a remote LED output to indicate the relay state (combined or isolated) away from the unit.

Recommended Pairings: Ideal for integrating a second or auxiliary battery bank in marine and vehicle applications. Can be used as a core component in an ADD A BATTERY Dual Circuit System.

WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.