Newmar 1-3-70 Battery Isolator

Ensure reliable and efficient power management on your marine vessel with the 1-3-70 Battery Isolator. Engineered for heavy-duty use, this isolator allows seamless charging of multiple batteries from one or two alternators while safeguarding against unwanted battery discharge or 'dumping'. Ideal for 12-, 24-, or 36-volt negative ground DC systems, it delivers stable performance tailored to the demanding needs of boating enthusiasts.

Key Features

• Conservatively rated diodes paired with a rustproof anodized aluminum heat sink case for enhanced durability.
• Robust, heavy-duty construction suitable for marine environments.
• Compatible with DC systems up to 48 volts, featuring a negative ground configuration.
• Stainless steel mounting hardware included for secure installation.
• Protective terminal covers to prevent corrosion and ensure longevity.

Technical Specifications

Specification	Details
Alternator Sources	1
Battery Bank	3
Max. Amperage Input Capacity	70 A
Stud Terminal Size	6 mm
Dimensions (L x W x H)	3.25 x 4.5 x 3.1 inches
Weight	2 lbs
Operating Temperature	-40°C to +80°C
Duty Cycle	Continuous rating to 50°C; derates linearly to 70% at 80°C
Temperature Rise	5°C at full rated current (mount vertically for optimum cooling)
Voltage Drop	0.7 V @ 50% load, 0.9 V @ full load

Important Information

Compatibility: The 1-3-70 Battery Isolator is not compatible with self-exciting alternators. Ensure your alternator has an external excitation lead. If unsure about your alternator's configuration, please consult the manufacturer prior to installation.

Return Policy: This product cannot be returned to the original point of purchase. For any issues or concerns, please contact the manufacturer directly for assistance.

Support and Resources

Download the 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.