Battery-Cables-&-Accessories > Battery-Isolators

ProMariner Multi Battery Isolators - 70 Amp

ProMariner Battery Isolators

ProMariner Battery Isolators null null null

ProMariner Multi Battery Isolators: Efficient Charging with Protection for Your Starter Battery

ProMariner Multi Battery Isolators, featuring gold-plated terminals for improved conductivity, are designed to enhance charging efficiency while preventing the total discharge of your starter battery. These solid-state devices ensure electrical current flows in one direction, allowing energy from the alternators to be distributed evenly across multiple batteries. This setup enables simultaneous charging of multiple batteries while isolating each one during operation, preventing fully charged batteries from discharging into undercharged ones.

These isolators are ideal for systems with one or two alternators connected to multiple battery banks, ensuring reliable power distribution without the risk of draining fully charged batteries. Designed for use with negative ground alternator systems, they are not recommended for use with self-energizing alternators. The ProMariner Multi Battery Isolators provide peace of mind by maintaining efficient power flow and battery protection in marine, RV, and automotive applications.


  • Rated for use with negative ground alternator systems ranging from 70 amps to 130 amps output
  • Will operate on 6, 12, 24, 32, and 36 volt systems
  • Charge Multiple Batteries While Preventing Interbank Discharge
  • Easy to Install Diode-Based Design. Ground Wire Not Required
  • Insulator Boots for Each Terminal to Prevent Short Circuits
  • Improved Heat Sink Design. Corrosion Resistant
  • Mount in a well-ventilated location as near to the alternator as possible
  • Do not mount on an engine or in proximity to an exhaust manifold
  • IP67 Rated; ROHS, CE, Prop65 and ABYC E-11 compliant
  • Download sell sheet here.
    Download installation manual here.

Item Description Price Qty in
Package 		In Stock Add to Cart
911072 ProMariner 11072, Battery Isolator, 1 Alternator/2 Batteries, 70 Amp (1 MIN) drawing 139.95 1 EA Call
911073 ProMariner 11073, Battery Isolator, 1 Alternator/3 Batteries, 70 Amp (1 MIN) drawing 174.95 1 EA ✓
912072 ProMariner 12072, Battery Isolator, 2 Alternator/2 Batteries, 70 Amp (1 MIN) drawing 239.95 1 EA ✓
912073 ProMariner 12073, Battery Isolator, 2 Alternator/3 Batteries, 70 amp (1 MIN) drawing 299.95 1 EA ✓

ProMariner Multi Battery Isolators - 130 Amp

130 Amp Battery Isolators

130 Amp Battery Isolators 130 Amp Battery Isolators 130 Amp Battery Isolators 130 Amp Battery Isolators

ProMariner Multi Battery Isolators: Efficient Charging for Multiple Battery Banks

ProMariner Multi Battery Isolators, equipped with gold-plated terminals for enhanced conductivity and efficiency, ensure reliable power distribution while protecting your starter battery from total discharge. These solid-state devices allow electrical current to flow in only one direction, using alternator-generated energy to charge multiple batteries simultaneously. The isolators prevent fully charged batteries from discharging into undercharged batteries, maintaining optimal battery health across multiple banks. Designed for negative ground alternator systems, they support one or two alternators connected to multiple batteries, ensuring safe and efficient charging.

These isolators are rated for alternator systems ranging from 70 to 130 amps and can operate on 6, 12, 24, 32, and 36-volt setups. The easy-to-install diode-based design eliminates the need for a ground wire, and each terminal includes insulator boots to prevent short circuits. With a corrosion-resistant heat sink design and an IP67 rating, these isolators are built to withstand harsh environments. However, they should be mounted in well-ventilated areas away from the engine or exhaust manifold to prevent overheating. Fully compliant with ROHS, CE, Prop65, and ABYC E-11 standards, ProMariner Isolators provide long-lasting, worry-free performance.


  • Rated for use with negative ground alternator systems ranging from 70 amps to 130 amps output
  • Will operate on 6, 12, 24, 32, and 36 volt systems
  • Charge Multiple Batteries While Preventing Interbank Discharge
  • Easy to Install Diode-Based Design. Ground Wire Not Required
  • Insulator Boots for Each Terminal to Prevent Short Circuits
  • Improved Heat Sink Design. Corrosion Resistant
  • Mount in a well-ventilated location as near to the alternator as possible
  • Do not mount on an engine or in proximity to an exhaust manifold
  • IP67 Rated; ROHS, CE, Prop65 and ABYC E-11 compliant
  • Download sell sheet here.
    Download installation manual here.

Item Description Price Qty in
Package 		In Stock Add to Cart
911132 ProMariner 11132, Battery Isolator, 1 Alternator/2 Batteries, 130 Amp (1 MIN) drawing 194.95 1 EA ✓
911133 ProMariner 11133, Battery Isolator, 1 Alternator/3 Batteries, 130 amp (1 MIN) drawing 254.95 1 EA ✓
912132 ProMariner 12132, Battery Isolator, 2 Alternator/2 Batteries, 130 amp (1 MIN) drawing 399.95 1 EA ✓
912133 ProMariner 12133, Battery Isolator, 2 Alternator/3 Batteries, 130 Amp (1 MIN) drawing 579.95 1 EA ✓

ProMariner Multi Battery Isolators - Limited Quantity

Battery Isolators

Battery Isolators null

ProMariner Battery Isolators are solid-state devices which allow electrical current to flow in one direction only. They efficiently utilize the energy produced by the alternators and distribute the power evenly to each battery. The isolators allows the batteries to charge together but isolate each battery during operation. They allow one or two alternators to be connected to multiple battery banks without fear of fully charged batteries discharging into undercharged batteries. Please note that these products are meant to be used with negative ground alternator systems, and are not recommended for use with self energizing style alternators.


  • Rated for use with negative ground alternator systems ranging from 10 amps to 130 amps output
  • Will operate on 6, 12, 24, 32, and 36 volt systems
  • Mount in a well-ventilated location as near to the alternator as possible
  • Do not mount on an engine or in proximity to an exhaust manifold
Item Description Price
1+ I Ext. Price I 5+ Ext. Price I
Qty in
Package 		In Stock Add to Cart
901702 ProMariner 01-70-2, Battery Isolator, 1 Alternator/2 Batteries, 70 Amp (1 MIN) (LIMITED QUANTITY) Sale Price: 48.23800
104.40 104.40 I 88.64800 88.65
1 EA ✓
901703 ProMariner 01-70-3, Battery Isolator, 1 Alternator/3 Batteries, 70 Amp (1 MIN) (LIMITED QUANTITY) Sale Price: 62.53100
134.19800 134.20 I 110.81700 110.82
1 EA ✓
Prop65 Warning