Newmar 1-3-165 Battery Isolator

The 1-3-165 Battery Isolator is a robust solution designed for marine and boating applications, enabling efficient charging of multiple batteries from one or two alternators while safeguarding against battery discharge or dumping. Tailored for 12-, 24-, or 36-volt negative ground DC systems, this isolator ensures each battery receives the optimal charge without the risk of overcharging.

Features

• Conservatively rated diodes and a rustproof anodized aluminum heat sink case.
• Heavy-duty construction suitable for marine environments.
• Compatible with systems up to 48 volts DC, negative ground.
• Rust-proof anodized aluminum case ensures longevity in harsh conditions.
• Stainless steel mounting hardware included for secure installation.
• Protective covers provided for terminals to prevent corrosion.

Specifications

Alternator Sources	1
Battery Bank	3
Max. Amperage Input Capacity	165 A
Stud Terminal Size	6 mm
Dimensions (L x W x H)	9 x 4.5 x 3.1 inches
Weight	5 lbs.
Operating Temperature	-40°C to +80°C
Duty Cycle	Continuous rating to 50°C, derate linearly to 70% at 80°C.
Temperature Rise	5°C at full rated current (mount vertically for optimum cooling)
Voltage Drop	0.7V at 50% load, 0.9V at 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.