Efficient Multi-Battery Charging with Advanced Isolation

These heavy-duty battery isolators enable seamless charging of multiple batteries from one or two alternators while preventing discharge between batteries. Each battery receives charge according to its specific needs, eliminating the risk of overcharging. Designed for durability and efficiency, these isolators are compatible with 12-48V negative ground DC systems. The robust construction includes high-quality diodes and a rust-proof anodized aluminum heat sink case, ensuring long-lasting performance in demanding marine environments.

Reliable Performance for Marine Applications

Engineered to handle high power loads, these isolators are available for 70, 120, and 165-amp alternators, making them a versatile solution for various vessel configurations. Stainless steel mounting hardware and protective terminal covers are included for added convenience and safety.

Technical Specifications

• Voltage Compatibility: 12V to 48V DC (negative ground systems)
• Alternator Compatibility: 70A, 120A, and 165A models available
• Operating Temperature Range: -40°C to +80°C
• Continuous Duty Cycle: Rated up to 50°C, with derating to 70% at 80°C
• Voltage Drop: 0.7V at 50% load, 0.9V at full load
• Temperature Rise: 5°C at full rated current (vertical mounting recommended for optimal cooling)

Durable and Corrosion-Resistant Construction

• Rust-proof anodized aluminum heat sink case
• Heavy-duty diodes for long-term reliability
• Stainless steel mounting hardware included
• Protective covers for terminal safety

Variations List

• 1-3-120 – Rated for 120 Amp alternators
• 1-3-70 – Rated for 70 Amp alternators

Important Note

These battery isolators are not compatible with self-exciting alternators. Consult your alternator manufacturer to confirm compatibility before installation.