Newmar 2-3-70 Battery Isolator

Ensure reliable power management on your vessel with the 2-3-70 Battery Isolator. Designed specifically for marine and boating applications, this heavy-duty isolator enables seamless charging of multiple batteries from one or two alternators. It effectively prevents the discharge, or ‘dumping’, of one battery into another, ensuring each battery is charged precisely according to its individual needs without the risk of overcharging. Compatible with 12V, 24V, and 36V negative ground DC systems, this isolator is a must-have for maintaining optimal battery performance on your boat.

Features

• Conservatively rated diodes for enhanced reliability in marine environments
• Rust-proof, anodized aluminum heat sink case ensures durability against harsh marine conditions
• Heavy-duty construction for long-lasting performance on boats and yachts
• Rated for systems up to 48 volts DC, negative ground, suitable for various marine applications
• Includes stainless steel mounting hardware for secure and corrosion-resistant installation
• Protective covers for terminals to prevent corrosion and debris ingress

Specifications

Parameter	Details
Alternator Sources	2
Battery Bank	3
Max. Amperage Input Capacity	70 A
Stud Terminal Size	6 mm
Dimensions (L x W x H)	6.5 x 4.5 x 3.1 inches
Weight	4 lbs.
Operating Temperature	-40 to +80°C
Duty Cycle	Continuous rating to 50°C, derated linearly to 70% at 80°C
Temperature Rise	5°C at full rated current (mount vertically for optimum cooling)
Voltage Drop	0.7V @ 50% load, 0.9V @ full load

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.

This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.

Quick Guide (PDF)

Orders of physical products placed by 3 PM EST M-F typically ships the same day, if all requested items are in stock. Weekend orders will typically ship on Monday.

Shipping takes 2-7 days.

We currently ship to the Contiguous 48 States.

Life of Sailing merch is custom made for the customer after an order is placed. Total turnaround is typically 7-14 days from order to doorstep.