ProMariner 130A Single Alternator 3-Battery Isolator

Description

The ProMariner 130A Single Alternator 3-Battery Isolator allows one alternator to charge three separate battery banks while maintaining electrical isolation between them. This configuration is useful on boats carrying multiple dedicated banks, such as engine-start, house, and accessory batteries, where each bank needs charging without being permanently tied to the others.

The isolator is rated for up to 130 amps and uses gold-plated terminals to support dependable high-current connections in demanding marine electrical systems. By separating the banks, a heavily discharged accessory or house battery is less likely to drain the starting bank when the alternator is no longer charging.

Proper alternator capacity, cable gauge, overcurrent protection, terminal insulation, and battery-bank compatibility should be confirmed before installation. This is particularly important on three-bank systems because the available alternator output must be shared among the connected batteries according to their charging needs.

For vessels that need to distribute charging from one alternator to three isolated battery banks while maintaining starting reserve, this ProMariner 130A isolator provides a compact and purpose-built solution. See what else we carry in battery isolators & charging relays.