NewMar 1-3-70 Battery Isolator 70 Amp 3 Bank Marine RV

The NewMar 1-3-70 is a heavy-duty battery isolator designed to charge multiple batteries automatically from a single alternator while preventing discharge between battery banks. This professional-grade isolator ensures each battery is charged according to its individual needs without overcharging, making it ideal for marine, RV, and commercial vehicle applications with 12V, 24V, or 36V negative ground DC systems.

Key Features:

• Conservatively rated diodes with rustproof anodized aluminum heat sink for maximum durability
• Heavy-duty construction designed for continuous operation in harsh environments
• Compatible with systems up to 48 volts DC, negative ground
• Corrosion-resistant anodized aluminum case for marine and outdoor use
• Includes stainless steel mounting hardware and protective terminal covers
• Vertical mounting orientation provides optimum cooling performance

Technical Specifications:

• Alternator Inputs: 1 source
• Battery Banks: 3 isolated outputs
• Maximum Amperage: 70 amps continuous
• Terminal Studs: 6mm threaded
• Dimensions: 3.25" L × 4.5" W × 3.1" H
• Weight: 2 lbs
• Operating Temperature: -40°F to +176°F (-40°C to +80°C)
• Duty Cycle: Continuous to 122°F (50°C), derate linearly to 70% at 176°F (80°C)
• Temperature Rise: 9°F (5°C) at full rated current with vertical mounting
• Voltage Drop: 0.7V at 50% load, 0.9V at full load

Important Compatibility Note: This battery isolator requires an alternator with an external excitation lead and is not compatible with self-exciting alternators. Consult your alternator manufacturer if you are unsure of your configuration.