---
product_id: 5059125
title: "Smart Dual Battery 140A Isolator - Auto/Boat/RV, Model: VSR12, Car & Vehicle Accessories / Parts"
brand: "jaycorp"
price: "600.16 DT"
currency: TND
in_stock: true
reviews_count: 8
category: "Jay Corp"
url: https://www.desertcart.tn/products/5059125-smart-dual-battery-140a-isolator-auto-boat-rv-model-vsr12
store_origin: TN
region: Tunisia
---

# Cut-In: 13.4V 140A Power Rating Water & Dust Resistant Smart Dual Battery 140A Isolator - Auto/Boat/RV, Model: VSR12, Car & Vehicle Accessories / Parts

**Brand:** jaycorp
**Price:** 600.16 DT
**Availability:** ✅ In Stock

## Summary

> 🔌 Power Up Your Adventures with Confidence!

## Quick Answers

- **What is this?** Smart Dual Battery 140A Isolator - Auto/Boat/RV, Model: VSR12, Car & Vehicle Accessories / Parts by jaycorp
- **How much does it cost?** 600.16 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/5059125-smart-dual-battery-140a-isolator-auto-boat-rv-model-vsr12)

## Best For

- jaycorp enthusiasts

## Why This Product

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

## Key Features

- • **Durable & Reliable:** Built to withstand the elements, ensuring longevity in any environment.
- • **Automatic Operation:** Smart technology that automatically manages your battery connections.
- • **Seamless Power Management:** Experience uninterrupted power flow with zero voltage drop.
- • **Compact & Versatile Design:** Fits anywhere with dimensions of just 2.68" x 2.68" x 1.93".
- • **User-Friendly Installation:** No complex wiring needed; includes mounting screws and detailed instructions.

## Overview

The Smart Dual Battery 140A Isolator (Model: VSR12) is a cutting-edge solution for managing battery connections in vehicles, boats, and RVs. With a compact design, automatic operation, and no voltage drop, it ensures reliable power management while being easy to install and resistant to water and dust.

## Description

Review: Not cheap because it's not cheap. - I am using this in a Ford e350 van, converted to a camper, to maintain the truck battery under the hood and maintain 2 deep cell marine batteries in the back, which i run a fridge/micro, etc. with using a 1500 watt inverter. I was told by many old school camper guys this setup wouldn't work, but it works great! The VSR is small and lightweight, and simple to hookup and use. It has one simple LED light letting you know where it's sending voltage. Proper gauge wire is imperative, i have 6 gauge run to all batteries, with a 150 amp ANL fuse, and have had no trouble at all with this unit. I returned a much larger, heat synced Northern tool unit after i saw the difference in size. This one is great under the hood of a van or any tight space. Word of note: I did have to trim some of the plastic away where my wires run in and out of the unit. It's 2 pieces and you have to trim away part of the cover if you're using proper gauge wire to get it to sit on the base correctly. This will make sense when you see the unit in person, and it's pretty obvious the manufacturer intended for you to cut or drill depending on your application.
Review: Workes flawlessly - I used this dual way, voltage sensing relay in my solar system install on my utility trailer. I installed it in-line with the charge wire coming into my trailer from my tow vehicle. I wanted to be able to charge my trailer battery while driving, and also allow my trailer solar system to charge the battery on my 4-wheel camper, which is mounted on my tow vehicle, while parked. When my truck is running and alternator is putting out at least 13.2 volts, the relay closes and charges my trailer battery. When parked and the sun is out, when my solar system puts out at least 13.2 volts, the relay closes and my solar system can charge both my trailer battery and my 4-wheel camper battery. This eliminated the need for mounting solar panels on my camper, making me a happy... camper :-)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00400IYTK |
| Best Sellers Rank | #170,324 in Automotive ( See Top 100 in Automotive ) #604 in Battery Chargers |
| Brand | JayCorp |
| Brand Name | JayCorp |
| Coil Voltage | 12 Volts |
| Connector Type | Wired |
| Contact Current Rating | 140 Amps |
| Contact Material | Silver Copper |
| Contact Type | Normally Open |
| Current Rating | 140 Amps |
| Customer Reviews | 4.6 out of 5 stars 249 Reviews |
| Manufacturer | True Amalgamated |
| Minimum Switching Voltage | 13.4 Volts |
| Model | VSR12 |
| Mounting Type | Surface Mount |
| Operation Mode | Automatic |
| Part Number | VSR12 |
| Specification Met | Iatf16949-2016 |
| Unit Count | 1 Count |

## Product Details

- **Connector Type:** Wired
- **Contact Material:** Silver Copper
- **Contact Type:** Normally Open
- **Current Rating:** 140 Amps
- **Mounting Type:** Surface Mount

## Images

![Smart Dual Battery 140A Isolator - Auto/Boat/RV, Model: VSR12, Car & Vehicle Accessories / Parts - Image 1](https://m.media-amazon.com/images/I/71uxDXnTRpL.jpg)
![Smart Dual Battery 140A Isolator - Auto/Boat/RV, Model: VSR12, Car & Vehicle Accessories / Parts - Image 2](https://m.media-amazon.com/images/I/71KIzy1e78L.jpg)
![Smart Dual Battery 140A Isolator - Auto/Boat/RV, Model: VSR12, Car & Vehicle Accessories / Parts - Image 3](https://m.media-amazon.com/images/I/71j8McmGJsL.jpg)
![Smart Dual Battery 140A Isolator - Auto/Boat/RV, Model: VSR12, Car & Vehicle Accessories / Parts - Image 4](https://m.media-amazon.com/images/I/416jN8TFaQL.jpg)
![Smart Dual Battery 140A Isolator - Auto/Boat/RV, Model: VSR12, Car & Vehicle Accessories / Parts - Image 5](https://m.media-amazon.com/images/I/81hX7Hqjs2L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Not cheap because it's not cheap.
*by E***E on January 21, 2012*

I am using this in a Ford e350 van, converted to a camper, to maintain the truck battery under the hood and maintain 2 deep cell marine batteries in the back, which i run a fridge/micro, etc. with using a 1500 watt inverter. I was told by many old school camper guys this setup wouldn't work, but it works great! The VSR is small and lightweight, and simple to hookup and use. It has one simple LED light letting you know where it's sending voltage. Proper gauge wire is imperative, i have 6 gauge run to all batteries, with a 150 amp ANL fuse, and have had no trouble at all with this unit. I returned a much larger, heat synced Northern tool unit after i saw the difference in size. This one is great under the hood of a van or any tight space. Word of note: I did have to trim some of the plastic away where my wires run in and out of the unit. It's 2 pieces and you have to trim away part of the cover if you're using proper gauge wire to get it to sit on the base correctly. This will make sense when you see the unit in person, and it's pretty obvious the manufacturer intended for you to cut or drill depending on your application.

### ⭐⭐⭐⭐⭐ Workes flawlessly
*by N***B on February 16, 2019*

I used this dual way, voltage sensing relay in my solar system install on my utility trailer. I installed it in-line with the charge wire coming into my trailer from my tow vehicle. I wanted to be able to charge my trailer battery while driving, and also allow my trailer solar system to charge the battery on my 4-wheel camper, which is mounted on my tow vehicle, while parked. When my truck is running and alternator is putting out at least 13.2 volts, the relay closes and charges my trailer battery. When parked and the sun is out, when my solar system puts out at least 13.2 volts, the relay closes and my solar system can charge both my trailer battery and my 4-wheel camper battery. This eliminated the need for mounting solar panels on my camper, making me a happy... camper :-)

### ⭐⭐⭐⭐⭐ Great product.
*by M***. on November 6, 2016*

Worked great while it lasted ... about two months into operation I serviced my truck myself during which I disconnected the negative battery pole from the under the hood battery but not the auxiliary battery in my truck berd since it's not connected to anything in the truck. When I was done with work and connected the batteries back again this unit did not come on since. I wrote and email to the seller but he did not respond. As much as I like this device, it's functionality, size, and even the design (the blue light looks cool when I show people the system and the whole isolator glows blue). Maybe I just had bad luck with this unit. Anyways I cannot with good concise spend another $80 and have it fail again, so I'm trying my luck with another manufacturer. EDIT: I was wrong, and I'm sorry. While working on the truck I discovered something that a friend changed in the wiring that I was not aware of during the job mentioned above ... after fixing that issue the Smart Dual Battery Isolator came back to life and all is well. So I admit to my mistake in accusing this product of not working properly when in fact it did and it was my bad.

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-06-06*