ARCO Marine BI-2703 Battery Isolator - 70A - 2 Alternator, 3 Battery

The BI-2703 Battery Isolator by Arco Marine is an essential component for maintaining a reliable and efficient electrical system on your boat. Designed to manage multiple alternators and batteries seamlessly, it ensures optimal charging and prevents unwanted battery drain, keeping your marine adventures powered without interruption.

Outstanding Features for Marine Applications

• Dual Alternator and Triple Battery Support: Handles up to 2 alternators and 3 batteries with a maximum current of 70A, perfect for complex marine electrical setups.
• Solid-State Isolation Technology: Prevents reverse current flow, ensuring that higher-charged batteries do not discharge into lower-charged ones.
• Automatic Proportional Charging: Both connected batteries receive charging proportional to their individual needs whenever the engine is running.
• Seamless Selector Switch Integration: Eliminates the need to manually switch positions, allowing for continuous charging of both batteries without interruption.
• Efficient Current Distribution: Automatically proportionates the alternator's output to each battery based on their requirements, independent of switch positions.

Technical Specifications

Model	BI-2703
Maximum Current	70A
Alternator Capacity	10A to 350A
Battery Capacity	Supports up to 3 batteries
Voltage Compatibility	12V, 24V, 32V negative ground systems
Type	Inboard/Outboard Battery Isolator

Compatibility and Usage Guidelines

The BI-2703 Battery Isolator is ideal for a variety of marine applications, supporting both inboard and outboard battery systems. It is compatible with boats that utilize multiple alternators and battery banks, ensuring efficient power management and reliable performance.

Important: This isolator is not suitable for 12-volt charging systems paired with 24-volt trolling motors or newer outboard engines equipped with rectifier-regulator charging systems.

Easy Installation and Maintenance

Installing the BI-2703 is straightforward, allowing marine enthusiasts to connect two alternators and three batteries without the risk of cross-discharge. Follow the included Quick Guide for detailed installation instructions to ensure optimal performance and longevity of your electrical system.

Additional Resources

Download the Quick Guide (PDF)

Return Policy

This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.

Orders of physical products placed by 3 PM EST M-F typically ships the same day, if all requested items are in stock. Weekend orders will typically ship on Monday.

Shipping takes 2-7 days.

We currently ship to the Contiguous 48 States.

Life of Sailing merch is custom made for the customer after an order is placed. Total turnaround is typically 7-14 days from order to doorstep.