ProMariner 70A 2-Alternator 2-Battery Isolator

Description

The ProMariner 70A Battery Isolator is designed for systems using two alternators and two separate battery banks. It provides a dedicated charging path that allows the banks to receive alternator output while remaining electrically isolated, helping preserve the charge in one bank if the other is discharged by onboard loads.

This model is rated for up to 70 amps and features gold-plated terminals for reliable high-current connections. The improved-efficiency design is intended for marine and mobile DC systems where charging needs to be shared without permanently paralleling the batteries.

A dual-alternator, dual-bank setup can be useful on boats with independent engine or accessory systems, but installation should still account for cable size, alternator output, battery capacity, overcurrent protection, and secure terminal insulation. Properly configured isolation helps maintain battery independence while charging sources are active.

For lower-current dual-alternator systems that need isolated charging of two batteries or battery banks, this ProMariner 70A isolator provides a simple and practical solution. Take a look through our battery isolators & charging relays.