Arco Starting & Charging BI-0702-4 Battery Isolator 70A 2 Battery Marine

The Arco Marine BI-0702-4 is a solid-state battery isolator designed for marine inboard and outboard applications. This device manages charging for 2 batteries from 1 alternator with a maximum current capacity of 70 amps, ensuring both batteries receive automatic proportional charging whenever the engine is running.

Key Features:

• 70-amp maximum capacity for 1 alternator and 2 battery banks
• Compatible with 10 to 350-amp alternators on 12V, 24V, or 32V negative ground systems
• Solid-state diode technology allows current flow in one direction only, preventing battery cross-discharge
• Includes regulator sensing terminal for optimal charging performance
• Proportional charging automatically adjusts output based on each battery's individual needs
• Works in conjunction with battery selector switches without requiring position changes during operation

How It Works:

The BI-0702-4 uses solid-state diode technology to create a one-way electrical path from the alternator to each battery. This prevents a higher-charged battery from discharging into a lower-charged battery while allowing both batteries to receive charging current simultaneously. The isolator intelligently distributes charging power proportionally based on each battery's state of charge, ensuring optimal performance and battery life.

Important Compatibility Note: This battery isolator cannot be used on 12-volt charging systems with 24-volt trolling motors or on newer outboard engines equipped with rectifier-regulator charging systems. Verify your system compatibility before installation.

Specifications:

• Maximum Current: 70 amps
• Alternator Inputs: 1
• Battery Outputs: 2
• Voltage Range: 12V, 24V, or 32V negative ground systems
• Alternator Compatibility: 10 to 350 amps
• Includes regulator sensing terminal