Argofet 200-3 Three batteries 200A battery isolator Argofet 200-3

Argofet 200-3 is a three-battery 200A battery isolator designed to manage charging of multiple battery banks. It provides automatic isolation between three batteries to prevent discharge between banks while allowing charging from a single alternator or charger. The unit is intended for vehicles, boats, and stationary systems that require reliable multi-battery charging and protection. The design supports continuous combined charging currents up to 200 A and separates battery circuits to keep starter, service, and auxiliary batteries independent during discharge periods.

Advantages

The Argofet 200-3 offers automatic, maintenance-free isolation of three battery banks, eliminating the need for manual switching. Its solid-state design reduces contact wear and arcing compared with mechanical relays, improving reliability in vibration-prone environments. The isolator allows simultaneous charging from a single alternator or charger while preventing cross-discharge, helping to preserve starter battery capacity and extend overall battery system uptime.

Suitable for

• Marine vessels with separate starter, house, and auxiliary batteries
• Commercial and recreational vehicles requiring multiple battery banks
• Off-grid and stationary systems where one charger feeds several batteries
• Applications needing automatic isolation without mechanical switching

When it may not be suitable

This isolator is designed for systems where a single alternator or charger feeds multiple battery banks and where automatic isolation is required. It may not be suitable for systems that require individual battery charging profiles or active battery balancing between banks. Systems that demand integrated battery management features such as cell-level monitoring, programmable charging stages, or communication with a central BMS may require a different solution.

Key specifications

• Number of isolated battery outputs: 3
• Continuous combined charging current: 200 A
• Function: automatic isolation of multiple battery banks during discharge and combined charging when charging source is present
• Typical applications: automotive, marine, and stationary multi-battery systems

How to use

Install the Argofet 200-3 following manufacturer wiring guidelines, placing the device between the alternator/charger output and the three battery banks. Ensure correct cable sizing and secure connections to handle peak charging currents. Once installed, the isolator operates automatically: when a charging source provides voltage, the device allows charging current to flow to all connected batteries; when the charging source is removed, it isolates each battery bank to prevent mutual discharge. Periodic visual inspection of connections and cable terminals is recommended to maintain reliable performance.

What to consider before purchase

• Ensure the unit's 200 A continuous combined charging rating meets the alternator or charger output and expected load
• Verify compatibility with battery types and system voltage in your application
• Confirm available installation space and required cable routing for three isolated outputs
• Check whether advanced battery management features are needed beyond automatic isolation

Usage recommendations

Use appropriately sized, high-quality cables and secure terminations to minimize voltage drop. Combine the isolator with a suitable charging source and battery monitoring for best results. For systems with differing battery chemistries or where individual charging algorithms are required, consider using dedicated chargers or a battery management system alongside the isolator.