---
product_id: 10263755
title: "Cole Hersee 48120 Battery Isolator"
brand: "cole hersee"
price: "A$14"
currency: AUD
in_stock: false
url: https://www.desertcart.com.au/products/10263755-cole-hersee-48120-battery-isolator
store_origin: AU
region: Australia
---

# 120A high current rating Compact 6.25'' x 4.19'' x 3.34'' size Robust 5/16'' stud terminals Cole Hersee 48120 Battery Isolator

**Brand:** cole hersee
**Price:** A$14
**Availability:** ❌ Out of Stock

## Summary

> ⚡ Stay Powered, Stay Ahead – The Battery Isolator Pros Trust!

## Quick Answers

- **What is this?** Cole Hersee 48120 Battery Isolator by cole hersee
- **How much does it cost?** A$14 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/10263755-cole-hersee-48120-battery-isolator)

## Best For

- cole hersee enthusiasts

## Why This Product

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

## Key Features

- • **Compact Yet Mighty:** Space-saving design fits seamlessly into your vehicle setup without compromise.
- • **Versatile Remote Control:** ON-NONE-ON operation mode with remote control for ultimate convenience.
- • **Precision OEM-Grade Build:** 100% new aftermarket unit engineered to meet strict OEM specs for reliability.
- • **Power Through with 120 Amps:** Handles heavy-duty battery loads effortlessly for uninterrupted performance.
- • **Copper Contacts for Durability:** High-quality copper contact material ensures long-lasting, corrosion-resistant connections.

## Overview

The Cole Hersee 48120 Battery Isolator is a 120-amp, OEM-spec aftermarket unit designed for vehicles with alternators lacking integral voltage regulators. Featuring durable copper contacts, robust 5/16'' stud terminals, and a compact form factor, it offers reliable remote-controlled ON-NONE-ON operation to protect and manage your battery system efficiently.

## Description

Cole Hersee 48120 Battery Isolator

## Features

- 100% New aftermarket unit built to meet OEM specifications
- Package Dimensions : 11.176 L x 17.018 H x 16.256 W (centimeters)
- Made in China
- Package Weight : 0.5 pounds

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001FQOGFS |
| Best Sellers Rank | #2,780,062 in Automotive ( See Top 100 in Automotive ) #3,839 in Battery Chargers |
| Brand Name | Cole Hersee |
| Circuit Type | 1-way |
| Color | Blue |
| Compatible Devices | Truck, RV |
| Compatible with Vehicle Type | Truck, RV |
| Connectivity Protocol | X-10 |
| Connector Type | Stud |
| Contact Material | Copper |
| Contact Type | Normally Open |
| Control Method | Remote |
| Control Type | Remote |
| Current Rating | 120 A |
| Customer Reviews | 4.5 4.5 out of 5 stars (72) |
| Global Trade Identification Number | 00632850311601 |
| Included Components | isolator |
| International Protection Rating | IP00 |
| Item Type Name | isolator |
| Item Weight | 2.1 pounds |
| Manufacturer | Cole Hersee |
| Material Type | Metal |
| Model | 48120 |
| Mounting Type | Rack Mount |
| Number of Items | 1 |
| Number of Positions | 4 |
| Operating Voltage | 36 volts |
| Operation Mode | ON-NONE-ON |
| Part Number | 48120 |
| Specification Met | Oem |
| Switch Type | Mechanical |
| Terminal | Screw |
| UPC | 632850311601 |
| Unit Count | 1 Count |
| Wattage | 4320 watts |

## Product Details

- **Brand:** Cole Hersee
- **Circuit Type:** 1-way
- **Connector Type:** Stud
- **Contact Type:** Normally Open
- **Current Rating:** 120 A
- **Material:** Metal
- **Operating Voltage:** 36 volts
- **Operation Mode:** ON-NONE-ON
- **Switch Type:** Mechanical
- **Terminal:** Screw

## Images

![Cole Hersee 48120 Battery Isolator - Image 1](https://m.media-amazon.com/images/I/81AGQi4p4BL.jpg)

## Questions & Answers

**Q: My 12v 180 amp alt puts out 12.8v @ 140 amps,will this step up volts to 14.2 (lithium)w/o changing amps?**
A: This is not a buck boost or charger.  It isolates batteries (two) such as start and windlass from another, typically larger, bank.  It keeps the fully charged smaller batteries from contributing to the load on the larger battery, typically.

You suffer a small voltage drop but otherwise it's transparent, and any change in incoming voltage would not be dependent on this unit.  If your system is getting 14.2V, these will get 13.5V (0.7VDC drop).

**Q: Is it possible to hook two batteries in parrallel for charging from one post?  So that 3 batteries are charging on two banks.**
A: Yes, we actually have two batteries in parallel on each side with the alternator output connected to the center.  Connected the way you are questioning Will provide the highest charge current to the battery with the lowest charge and this is what you want.

**Q: can this be use on 2 separate solar battery banks**
A: I don't see why not. Hook the charge controller output to the center alternator terminal, then each of the two banks to the other two posts. Make sure all three share the same physical ground and so long as you don't exceed the total amp rating of the isolator it should work fine.

**Q: Is this unit sealed?   I want to mount it under the hood but I'm not sure if it's water resistant.  It says "contaminant resistant."**
A: Yes it’s a sealed unit. I installed mine under my air box on the front side of the passenger wheel well on a 2012 Sierra with no issue for a little over a year now

## Frequently Bought Together

- Cole Hersee 48120 Battery Isolator
- SELTERM 10pcs - 2/0 Awg - 5/16" Stud - Battery Lugs - Ring Terminal Connectors with 12pcs 3:1 Black & Red Heat Shrink Tubing with Adhesive | Heavy Duty Battery Cable Ends - Tinned Copper Wire Lugs Kit
- SELTERM 10pcs - 2/0 Awg - 3/8" Stud - Battery Lugs - Ring Terminal Connectors | with 12pcs 3:1 Black & Red Heat Shrink Tubing with Adhesive | Heavy Duty Battery Cable Ends - Bare Copper Wire Lugs Kit

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**Shop now:** [https://www.desertcart.com.au/products/10263755-cole-hersee-48120-battery-isolator](https://www.desertcart.com.au/products/10263755-cole-hersee-48120-battery-isolator)

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-09-18*