ProMariner 130A Single Alternator 2-Battery Isolator

Description

The ProMariner 130A Single Alternator 2-Battery Isolator allows one alternator to charge two battery banks while maintaining electrical separation between them. This is a common arrangement for boats with a dedicated starting battery and a separate house or accessory bank, where both batteries need alternator charging but the starting reserve should remain protected from house loads.

The unit is rated for up to 130 amps and uses gold-plated terminals to support reliable high-current connections. Its improved-efficiency design provides a straightforward isolation method for marine DC systems without permanently paralleling the batteries.

When the charging source is removed, the isolator helps keep the banks independent so a discharged accessory bank does not automatically discharge the starting battery. Proper installation should account for alternator output, battery-bank size, cable gauge, terminal protection, and suitable overcurrent protection.

For single-alternator systems requiring isolated charging of two battery banks at currents up to 130A, this ProMariner isolator provides a compact, practical charging-distribution solution. See our other battery isolators & charging relays.