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The Original Retailer of True® Dual Smart Battery Isolator

True® Dual Battery Kit – Smart & Heavy Duty, 12V 140A

Marine Dual Battery Kit True Isolator System

 

marine battery isolator switch
marine battery isolator switch

Power, reliability, and peace of mind on the water — that’s what the TrueAm Marine Dual Battery Kit with Isolator System delivers. Designed for boaters who demand dependable energy management, this kit ensures your vessel has the backup power it needs for long days offshore, extended anchoring, or powering multiple accessories without compromising your starting battery.

Built for Marine Environments

The TrueAm Dual Battery Kit is engineered specifically for marine use, with rugged components that withstand saltwater, humidity, and constant vibration. Every bracket, cable, and connector is marine‑grade, ensuring corrosion resistance and long‑lasting durability. Whether you’re navigating coastal waters or enjoying freshwater lakes, this kit is built to perform in the toughest conditions.

Intelligent Battery Isolation

At the heart of the system is the TrueAm isolator, a smart device that automatically manages charging between your primary and auxiliary batteries. When your engine is running, both batteries receive charge. When the engine is off, the isolator separates them, allowing your auxiliary battery to power electronics, lights, pumps, or entertainment systems while your starter battery remains fully protected. This eliminates the risk of being stranded with a drained starting battery — a critical safeguard for any boater.

Seamless Integration & Easy Installation

TrueAm designed this kit for straightforward installation, with precision‑cut brackets and high‑quality wiring that integrate cleanly into your vessel’s electrical system. Clear instructions and plug‑and‑play components make setup simple, even for DIY boat owners. The result is a professional‑grade system without the hassle of complex modifications.

Key Features & Benefits

  • Dual Battery Capability: Supports a dedicated auxiliary battery for accessories.
  • Automatic Isolation: Smart isolator separates batteries when the engine is off.
  • Marine‑Grade Durability: Corrosion‑resistant hardware and heavy‑duty wiring.
  • Reliable Power Management: Keeps starter battery safe while powering electronics.
  • Versatile Applications: Ideal for fishing boats, cruisers, pontoons, and yachts.
  • Peace of Mind: Ensures you always have starting power available.

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  • Designed for 12V marine engine
  • Voltage-sensitive relay up to 140 Amp
  • Dual sensing VSR
  • The starting battery is set up as priority charging
  • Alternator Amp – 150
  • Manufactured by TrueAm Technology
  • Fully automatic marine dual battery kit
  • Guaranteed waterproof and heat resistant cables up to 130 degrees
  • A marine battery isolator switch is maintenance free technology
  • Free shipping and 1-day dispatch

This is an excellent marine battery isolator switch that allows you to add a second or third battery system in your boat. With its basic functionality that utilizes the most modern battery technology, this automatic dual battery switch keeps all batteries charged from the engine’s electrical parts while keeping the starting battery isolated. These features keep you out of trouble in the sea.

 

Using the same relay setup in our boat, this marine battery shut off switch keeps boat batteries and accessories charged, all the while isolating the boat’s starter battery system to keep it charged as well.

One major advantage of this TrueAm marine battery isolator technology is that you don’t need to reroute the fully automatic alternator wires. With this marine battery cutoff switch, you are in total control as it features a do-it-yourself approach.

Product composition

Marine battery disconnect switch
Marine battery disconnect switch

This marine battery isolator kit has voltage sensor and automatic switches, which is responsible for safe separation and charging of the starter system as well as the auxiliary batteries found in all solar and volt marine applications. When firing the engine, the starting battery is separated and the only one allowed to charge instead of the auxiliary batteries. Both batteries will be charged once the voltage reaches 13.3 volts, engaging the voltage sensitive relay (VSR).

 

Once the engine stops and the battery charge falls below 12.8 bolts, the system’s VSR feature allows the separation of the starting and marine auxiliary system, turning off the indicator light and powering the boat auxiliary battery kit without the risk of draining all the power from the starting battery.

 

The VSR also features a Dual Sensing that monitors the charge of the two batteries. It is responsible for charging both batteries if only either one of them is receiving a charge.

 

This outstanding marine battery disconnect switch requires easy installation. It comes with all necessary components and wiring diagram for proper installation. With this marine battery switch, cutting into a factory wiring and voiding manufacturer warranty is not needed.

Get your marine battery disconnect switch from the official TrueAm retailer now!

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