---
product_id: 16669226
title: "Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup - Automatic Disconnect Switch for Car, Truck, RV, UTV, ATV, Marine"
brand: "keyline chargers"
price: "R$1413"
currency: BRL
in_stock: true
url: https://www.desertcart.com.br/products/16669226-dual-battery-isolator-kit-12v-140-amp-voltage-sensitive-relay
store_origin: BR
region: Brazil
---

# 140A max current IP65 water & dust resistant 12V smart voltage sensing Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup - Automatic Disconnect Switch for Car, Truck, RV, UTV, ATV, Marine

**Brand:** keyline chargers
**Price:** R$1413
**Availability:** ✅ In Stock

## Summary

> 🔌 Power up your adventure with smart, seamless dual battery control!

## Quick Answers

- **What is this?** Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup - Automatic Disconnect Switch for Car, Truck, RV, UTV, ATV, Marine by keyline chargers
- **How much does it cost?** R$1413 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/16669226-dual-battery-isolator-kit-12v-140-amp-voltage-sensitive-relay)

## Best For

- keyline chargers enthusiasts

## Why This Product

- Trusted keyline chargers brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Rugged & Reliable:** IP65-rated solid-state design built to withstand water, dust, and vibration in extreme off-road and marine environments.
- • **Seamless Power Flow:** Automatic disconnect switch eliminates voltage drops for uninterrupted dual battery performance.
- • **Compact & Easy Install:** Small 2.6” x 2.6” x 2” footprint with included mounting hardware—perfect for tight engine bays and battery relocations.
- • **Smart Voltage Activation:** Engages at 13.3V and disengages at 12.8V to keep your starter battery fully charged without manual intervention.
- • **Confidence Backed Warranty:** Industry-leading 12-month warranty plus 30-day money-back guarantee ensures risk-free upgrade to premium power management.

## Overview

This Dual Battery Isolator Kit features a 140 Amp smart voltage sensitive relay that automatically manages power distribution between two 12V batteries. Its IP65-rated rugged design ensures durability against water, dust, and vibration, making it ideal for automotive, marine, RV, and off-road applications. Compact and easy to install, it activates at 13.3V and disconnects at 12.8V to prevent battery drain, backed by a 12-month warranty and 30-day money-back guarantee.

## Description

Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup - Automatic Disconnect Switch for Car, Truck, RV, UTV, ATV, Marine

## Features

- Advanced Dual Battery Isolator 12V Kit – Designed for superior performance, this dual battery kit ensures efficient power distribution between two batteries without voltage drops. Unlike traditional battery isolator diodes, this automatic disconnect switch eliminates power loss while maintaining a seamless connection between your primary and auxiliary power sources. Compact at 2.6” x 2.6” x 2”, it’s perfect for under-hood installations or as part of a battery relocation kit.
- Smart Voltage Sensitive Relay (VSR) for Optimal Charging – Featuring a 12V dual battery wiring kit, this system automatically activates at 13.3V and disengages at 12.8V, ensuring your starting battery remains fully charged. Whether you're installing a marine dual battery kit for your boat, a dual battery kit for truck applications, or need a battery isolator 12V kit for off-grid power, this setup prevents battery drain and guarantees reliable performance.
- Built for Extreme Conditions & Rugged Durability – Engineered for off-road adventures, marine use, and daily driving, this dual battery isolator kit is IP65-rated for water, dust, and vibration resistance. Its solid-state design ensures durability, making it an excellent choice for automotive, RV, UTV, and marine battery isolator needs. Whether battling tough trails or navigating open waters, count on this dual battery wiring kit to provide uninterrupted power.
- EASY-TO-USE: The 140 Amp Dual Battery Smart Isolator comes with mounting plate and hardware. Does not include installation wires. Easy-to-follow directions for the most novice DIYer. What could be easier? **If you need installation wiring, see Dual Battery Kit or ATV/UTV Kit.
- Trusted Performance with Warranty & Money-Back Guarantee – Every dual battery kit by KeyLine Chargers is backed by a 12-month industry-leading warranty. If you’re not 100% satisfied with your purchase, take advantage of our 30-day money-back guarantee—no questions asked! Drive with confidence knowing you have a premium battery isolator 12V kit keeping your power system running at full capacity.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Specification Met | Ip65 |
| International Protection Rating | IP65 |
| Number of Positions | 1 |
| Actuator Type | Rotary |
| Control Method | Touch |
| Connectivity Protocol | X-10 |
| Wattage | 1.68E+3 |
| Connector Type Used on Cable | Crimp |
| Switch Type | Automatic Battery Disconnect Switch |
| Terminal | Physical |
| Circuit Type | 2-way |
| Mounting Type | Plate Mount |
| Operation Mode | automatic |
| Current Rating | 1.4E+2 Amps |
| Operating Voltage | 13.3 Volts |
| Contact Type | Normally Open |
| Unit Count | 1.0 Count |
| Number of Items | 1 |
| Item Dimensions | 1.97 x 1.97 x 1.97 inches |
| Color | Black |

## Images

![Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup - Automatic Disconnect Switch for Car, Truck, RV, UTV, ATV, Marine - Image 1](https://m.media-amazon.com/images/I/718YwOW-isL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: What gauge is the supplied wires?**
A: The kit comes with 7 AWG wire, but wanted to comment on the customer who stated that it is not enough for a 20 foot run.  At 140 amps, you would need 1/0 AWG wire, but with 95% of the applications out there, the most current that is drawn is around 30-50 amps and that is why we designed the kit with 7 AWG for the 20 foot run.  I hope that helps clarify.

**Q: Will the alternator charge battery 2 with this while car is running**
A: Yes it will. That is precisely one of the features it is designed to do.  Thanks

**Q: I have a 2020 wrangler with a 240 amp alternator. is this rated to work with my alternator? i will be adding a second battery for low-draw accessories**
A: Hello, a 240 amp alternator is definitely a big alternator, however, it is rare that an application would draw more than 40-60 amps at any one time.  It is not so much the alternator size that would cause a problem for our isolator it is the draw from the accessories.  I would recommend adding up the amperage draw from your accessories when they would all be on and determine the draw, if it is under 140amps then it will work well. If you decide to go ahead and use our Keyline Battery Isolator then you may want to install a large 140 amp fuse or breaker to ensure your alternator won't fry the isolator, but again that would be a rare accessory draw application like an induction cooktop or something similar that would draw over 100amps. Remember that the alternator is only going to push enough amps to power the draw of the accessories and to charge the battery (which also has a low amperage draw).  Hope that helps.  Thanks for the question.

**Q: can this be use to charge a lithium batteries on the second battery?**
A: Short answer: it depends.

Longer answer:  it depends on the Li bank  capacity, battery charging specs, alternator specs, resistance of the entire circuit, etc.  

In my case I replaced 220Ah of flooded lead-acid with 100Ah of LiFePO4 and demand on the alternator actually /decreased/ a bit.   If the isolator is already installed you could test it briefly to see what voltage/current from the alternator is like.  If you do not already have the isolator a DC-DC sized to your alternator's rating would be a safer bet.

## Frequently Bought Together

- Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup - Automatic Disconnect Switch for Car, Truck, RV, UTV, ATV, Marine
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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-03-01*