Description
ARCO Marine 120A Battery Isolator | Boat Supply Store
For boat owners operating multiple battery banks from a single alternator, this unit provides an automated solution to ensure all batteries receive optimal charging current. The solid-state design prevents parasitic drain by allowing one-way current flow from the alternator, safeguarding individual battery health. Engineered to handle up to 120A, it's suitable for 12, 24, or 32-volt negative ground systems with alternators ranging from 10 to 350A. This device is critical for maintaining charge integrity across auxiliary and start batteries on larger cruising yachts or offshore fishing vessels.
Key Features
- Automatically proportions charging current across multiple battery banks.
- Prevents parasitic discharge between batteries with solid-state design.
- Supports 1 alternator and up to 3 batteries for versatile configuration.
- Rated for a 120A maximum current, ensuring robust performance.
- Compatible with 12V, 24V, and 32V negative ground systems.
- Includes an exciter terminal for advanced integration.
- Solid-state construction ensures reliable, one-way current flow.
- Eliminates the need for manual battery switching.
Specifications
| Product Specifications | |
|---|---|
| Maximum Amperage | 120A |
| Alternators Supported | 1 |
| Batteries Supported | 3 |
| Voltage Compatibility | 12V, 24V, 32V negative ground |
| Alternator Range | 10-350A |
| Features | Exciter terminal, Solid-state design |
Who This Is For
Boat owners with multiple battery banks (up to 3) requiring efficient, automated charging from a single alternator. Ideal for those seeking to prevent inter-battery discharge on 12, 24, or 32-volt negative ground systems.
How It Compares
| Feature | ARCO Marine 120A Battery Isolator | Competitor |
|---|---|---|
| Number of Batteries Supported | 3 | 2 |
| Maximum Amperage | 120A | 120A |
| Voltage Compatibility | 12V, 24V, 32V | 12V/24V |
| Type | Battery Isolator | Automatic Charging Relay |
Common Concerns Answered
What are the limitations of the ARCO Marine BI-1203-3A?
This battery isolator cannot be used with 12-volt systems that incorporate 24-volt trolling motors, nor is it compatible with newer outboard engines featuring integrated rectifier-regulator charging systems.
What if I encounter an issue with this product?
Due to potential return restrictions, direct contact with the manufacturer may be required for any product defects or issues, so it's advisable to be certain of compatibility before purchase.
Is this isolator suitable for all modern outboard engines?
No, this unit is specifically not compatible with newer outboard engines that utilize rectifier-regulator charging systems. Always verify your engine's charging system specifications.
Frequently Asked Questions
What is a battery isolator and how does it work?
A battery isolator, like the ARCO Marine BI-1203-3A, is an electronic device that allows a single alternator to charge multiple battery banks independently. It uses diodes to direct charging current to each battery bank without allowing them to discharge into each other when the engine is off.
Can I use the ARCO Marine BI-1203-3A with a 12-volt system and a 24-volt trolling motor?
No, this specific model is not compatible with a 12-volt system when a 24-volt trolling motor is in use. This configuration requires a different charging management solution.
What is the maximum amperage this battery isolator can handle?
The ARCO Marine BI-1203-3A is rated to handle a maximum continuous current of 120A.
How many alternators and batteries can the ARCO Marine BI-1203-3A support?
This isolator is designed to work with one alternator and can support up to three separate battery banks.
What is the purpose of the exciter terminal on this isolator?
The exciter terminal is typically used to trigger the alternator's output or to inform the alternator that the battery system is connected and charging is required. Its specific function can vary based on the alternator model.
