---
product_id: 10263755
title: "Cole Hersee 48120 Battery Isolator"
brand: "cole hersee"
price: "Bs.4903"
currency: BOB
in_stock: true
reviews_count: 8
url: https://www.desertcart.bo/products/10263755-cole-hersee-48120-battery-isolator
store_origin: BO
region: Bolivia
---

# 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:** Bs.4903
**Availability:** ✅ In 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?** Bs.4903 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/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

For use with alternators that do not have an integral electronic voltage regulator. 48120-BK: 120 amps. Terminations: Three 5/16'' studs. Four 9/32'' diameter mounting holes. Size: 6-1/4''Lx4-3/16''Wx3-11/32''H.

## 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 |
|---------------|-------|
| Operation Mode | ON-NONE-ON |
| Current Rating | 120 Amps |
| Operating Voltage | 36 Volts |
| Contact Type | Normally Open |
| Connector Type | Stud |
| Brand | Cole Hersee |
| Terminal | Screw |
| Circuit Type | 1-way |
| Contact Material | Copper |
| International Protection Rating | IP00 |
| Number of Positions | 4 |
| Control Method | Remote |
| Connectivity Protocol | X-10 |
| Unit Count | 1.0 Count |
| Global Trade Identification Number | 00632850311601 |
| Manufacturer | Cole Hersee |
| UPC | 632850311601 |
| Item Weight | 2.12 pounds |
| Item model number | 48120 |
| Batteries | 1 Unknown batteries required. |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | 48120 |
| OEM Part Number | 48120 |

## Product Details

- **Operation Mode:** ON-NONE-ON
- **Current Rating:** 120 Amps
- **Operating Voltage:** 36 Volts
- **Contact Type:** Normally Open
- **Connector Type:** Stud
- **Brand:** Cole Hersee
- **Terminal:** Screw
- **Circuit Type:** 1-way
- **Contact Material:** Copper
- **International Protection Rating:** IP00

## 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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent isolator for RV
*by R***. on August 10, 2015*

This item is well-constructed and was easy to install in place of a failed unit from a different manufacturer. It worked as expected from the get-go; the application was a class "A" RV with two battery banks and the result is that both banks charge as originally designed using a "smart" charger/converter in addition to the engine alternator. A nice item at a good price, super-fast shipping as well.

### ⭐⭐⭐⭐⭐ Great dual battery isolator
*by T***N on October 28, 2019*

Installed easily on dual battery system for my boat. Works perfect and went with 140 amp isolator to add some buffer for my 120 amp charging system. Was recommended from reviews.

### ⭐⭐⭐⭐⭐ works perfect
*by S***K on April 10, 2022*

Good value

## 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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*Product available on Desertcart Bolivia*
*Store origin: BO*
*Last updated: 2026-02-17*