NewMar 1-2-120 Battery Isolator 120 Amp Dual Bank 12V 24V 36V

The NewMar 1-2-120 is a heavy-duty 120-amp battery isolator designed to automatically charge multiple batteries from one or two alternators while preventing discharge or 'dumping' of one battery into another. Each battery is charged according to its specific needs without overcharging, making it ideal for marine, RV, and commercial vehicle applications with 12-, 24-, or 36-volt negative ground DC systems.

Key Features:

• Conservatively rated diodes with rustproof anodized aluminum heat sink case for superior heat dissipation
• Heavy-duty construction suitable for continuous duty applications
• Compatible with systems up to 48 volts DC, negative ground
• Stainless steel mounting hardware and protective terminal covers included
• Manages one alternator source charging two independent battery banks

Technical Specifications:

• Maximum Input Capacity: 120 amps
• Alternator Sources: 1
• Battery Banks: 2
• Operating Temperature Range: -40°F to +80°F
• Voltage Drop: 0.7V at 50% load, 0.9V at full load
• Temperature Rise: 5°C at full rated current (vertical mounting recommended)
• Duty Cycle: Continuous rating to 50°C, derate linearly to 70% at 80°C
• Stud Terminal Size: 6mm
• Dimensions: 6.5" L × 4.5" W × 3.1" H
• Weight: 3 lbs

Important Compatibility Note: This battery isolator is not compatible with self-exciting alternators. The alternator must have an external excitation lead. Consult your alternator manufacturer if uncertain about your configuration.