Newmar Power 1-2-120 Battery Isolator — 120 Amp Heavy-Duty DC System Separator

1-2-120 Battery Isolator

This heavy-duty isolator allows multiple batteries to charge automatically from one or two alternators and prevents the discharge or dumping of one battery into another. Each battery is charged according to its need without overcharging and is rated for 12-, 24-, or 36-volt, negative ground DC systems. This model is a 120-amp alternator.

Features:

• Conservatively rated diodes and a rustproof anodized aluminum heat sink case
• Heavy duty construction
• Rated for systems up to 48 volts DC, negative ground
• Rust-proof anodized aluminum case
• Stainless steel mounting hardware provided
• Protective covers provided for terminals

Specifications:

• Operating Temperature: -40 to +80
• Duty Cycle: Continuous rating to 50 C Derate linearly to 70% @ 80 C
• Temp. Rise: 5 C at full rated current (mount vertically for optimum cooling)
• Voltage Drop: 0.7V @ 50% load, 0.9V @ full load
• Alternator Sources: 1
• Battery Bank: 2
• Max. Amperage Input Capacity: 120
• Stud Terminal Size: 6mm
• Dimensions (L x W x H): 6.5" x 4.5" x 3.1"
• Weight: 3 lbs.

Note: These battery isolators are not compatible with self-exciting alternators. The alternator must have an external excitation lead. Please consult the manufacturer of your alternator if you are unsure of your configuration

The Newmar Power 1-2-120 Battery Isolator is designed to efficiently manage multiple battery banks in 12-, 24-, or 36-volt negative ground DC systems. Its heavy-duty construction ensures reliable performance in demanding environments, allowing automatic charging from one or two alternators while preventing battery discharge or cross-dumping. This model is rated for a maximum of 120 amps, making it suitable for various automotive, marine, and RV applications. The isolator features conservatively rated diodes and a rustproof anodized aluminum heat sink case to ensure durability and effective thermal management during operation. Its robust design includes stainless steel mounting hardware and protective covers for terminals, facilitating secure installation and safeguarding against accidental contact. Operating efficiently across a temperature range of -40°F to +80°F, the isolator maintains continuous duty cycle performance, with a linear derating at higher temperatures to preserve longevity. The voltage drop remains low at 0.7V at half load and 0.9V at full load, ensuring minimal energy loss during operation. Compatibility requires an external excitation lead, as it is not suitable for self-exciting alternators; consult your alternator manufacturer if unsure. Compact and lightweight, the unit measures approximately 6.5 inches long by 4.5 inches wide and 3.1 inches high, weighing around 3 pounds, making it easy to integrate into existing systems. This battery isolator is an essential component for maintaining reliable power distribution and battery health across multiple banks, ensuring your electrical system performs optimally in demanding conditions.

Features:

• Conservatively rated diodes and rustproof anodized aluminum heat sink case for durability and thermal efficiency

• Heavy-duty construction designed for demanding applications

• Rated for systems up to 48 volts DC with negative ground

• Includes stainless steel mounting hardware and protective terminal covers for secure installation

• Designed for continuous operation with a temperature range of -40°F to +80°F and linear derating at higher temperatures

• Low voltage drop of 0.7V at half load and 0.9V at full load to minimize energy loss

• Maximum capacity of 120 amps, suitable for multiple battery banks

• Compact dimensions and lightweight design for easy integration into various systems

• Requires external excitation lead; incompatible with self-exciting alternators