ARCO Marine BI-3203 Battery Isolator - 120A - 2 Alternator, 3 Battery

The Arco Marine BI-3203 Battery Isolator is a robust solution designed for marine applications, seamlessly managing multiple alternators and batteries to ensure optimal performance and reliability on your vessel. Whether you're outfitting an inboard or outboard system, this isolator maintains your power systems efficiently, allowing you to enjoy uninterrupted boating experiences.

Product Overview

The BI-3203 Battery Isolator by Arco Marine is engineered to handle up to 2 alternators and 3 batteries with a maximum current capacity of 120A. It is compatible with 10 to 350-amp alternators and supports 12, 24, or 32-volt negative ground systems, making it versatile for various marine electrical setups. This solid-state device ensures that your batteries are charged proportionally based on their needs, safeguarding against discharge and enhancing the longevity of your power systems.

Key Features

• Multiple Alternator Support: Accommodates 2 alternators, allowing for more efficient charging and redundancy.
• Battery Management: Supports up to 3 batteries, providing flexibility for different power requirements.
• High Current Capacity: Handles up to 120A to meet demanding marine electrical needs.
• Solid-State Technology: Ensures current flows in only one direction, preventing battery drain and ensuring safe operation.
• Automatic Proportioning: Charges each battery according to its specific needs without manual intervention.
• Compatibility: Suitable for 12, 24, or 32-volt negative ground systems, enhancing versatility across various marine applications.
• Seamless Integration: Works in conjunction with selector switches without the need to change switch positions for charging both batteries.

Specifications

Feature	Specification
Model	BI-3203
Maximum Current	120A
Alternator Compatibility	10 to 350-amp
Battery Support	Up to 3 batteries
Voltage Compatibility	12V, 24V, 32V Negative Ground Systems
Installation	Inboard/Outboard

Benefits for Marine Applications

Using the BI-3203 Battery Isolator in your marine setup ensures that your vessel's electrical system operates smoothly and efficiently. By preventing one battery from discharging into another, it extends the life of your batteries and ensures that critical systems remain powered during extended trips. The automatic charging feature means less maintenance and more time enjoying your time on the water.

Important Notes

NOTE: Battery isolators cannot be used on 12-volt charging systems with 24-volt trolling motors or newer outboard engines equipped with rectifier-regulator charging systems.

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

Additional Resources

For more information and installation guidance, please refer to the Quick Guide (PDF).

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.

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