12V 140A Voltage Sensitive Relay Kit – Dual Battery Isolator IP65 – Model 5 m

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The 12V 140A voltage sensitive relay kit – model 5 m is designed for dual battery installations where the auxiliary battery is installed further from the main battery: van rear, camper cell, technical hold, long trunk, boat compartment, or remote utility area.

This version with 5 m red battery cable allows for a clean connection between the engine battery and the service battery, while maintaining automatic operation. When the 12V circuit reaches a sufficient charging voltage, the relay connects the batteries. When the voltage drops, it separates them to limit the discharge of the starter battery.

Highlights of the 5 m model

• Length 5 m: suitable for vans, campers, and long vehicles.
• 12V Automatic Relay: coupling and separation according to detected voltage.
• Main Battery Protection: limits discharge when stopped.
• 140A Continuous Current: designed for a 12V auxiliary installation.
• IP65 Rating: housing protected against dust and water splashes.
• Included Accessories: cables, fuse holder, terminals, lugs, and screws.
• 2-year warranty.

This dual battery isolator kit allows you to add an auxiliary battery to a 12V-equipped vehicle. It is particularly useful when you want to power accessories from a service battery without directly drawing from the engine battery.

The 5 m model is suitable for setups where the wiring distance becomes more significant than on the 2 m or 4 m versions. It is particularly suitable for converted vehicles with an auxiliary battery placed at the rear, camper cells, boats with remote service batteries, or trucks equipped with 12V accessories.

The relay operates without daily manual management. It activates automatically when the voltage reaches about 13.3V, then deactivates when the voltage drops around 12.8V. This principle allows the auxiliary battery to be charged when the vehicle provides sufficient voltage, then preserves the main battery when the engine is stopped.

Recommended uses

• Converted van with auxiliary battery at the rear.
• Camper with service battery in hold or cell.
• Truck, utility vehicle or pickup with remote 12V equipment.
• 4x4, ATV, UTV and recreational vehicle.
• Boat, yacht or 12V marine application.
• Dual battery installation with long intermediate cable distance.
• Powering accessories from a secondary battery.

Relay operation

• The relay monitors the 12V circuit voltage.
• At approximately 13.3V, it connects the two batteries to allow charging.
• At approximately 12.8V, it separates the main battery and the auxiliary battery.
• The disengagement delay is about 5 to 10 seconds.
• The starting battery remains better protected when accessories draw from the auxiliary battery.

Technical specifications

• Model: JDQTJ-5M
• Version: 5 m model
• Type: voltage-sensitive relay / dual battery isolator
• Nominal voltage: 12V DC
• Continuous current: 140A
• Intermittent current: 160A
• Activation voltage: 13.3V
• Cut-off voltage: 12.8V
• Protection rating: IP65
• Housing material: nylon plastic
• Operating consumption: 280 mA
• Standby consumption: 8 mA
• Power studs: stainless steel M6
• Activation delay time: 5 seconds
• Disengagement delay: approximately 5 to 10 seconds
• Operating temperature: -30°C to +105°C
• Relay dimensions: 6.76 x 5.36 x 6.76 cm
• Net kit weight: approximately 1.88 kg
• Warranty: 2 years

Box contents

• 1 separate 12V charge relay
• 1 red battery cable 110A of 5 m
• 1 black ground cable 110A of 1 m
• 1 positive marine battery terminal
• 1 negative marine battery terminal
• 2 fuse holders
• 3 lug connectors
• 3 insulated blue ring terminals
• 15 cable ties
• 2 red cables 110A of 250 mm
• 2 heat shrink tubes
• 1 drill bit
• 1 black split conduit
• 1 set of screws

Why choose the 5 m version?

The 5 m version is advantageous when the auxiliary battery is installed further away than in a compact setup, but without requiring a very long cable. It offers a good margin to follow a clean path in a converted vehicle: along a wall, passing towards a hold, bypassing a box or reaching a service battery located at the rear.

It is well-suited for installations where the cable needs to be neatly secured and protected over a longer distance, without being too short like a 2 m or 4 m model.

Installation tips

Before installation, plan the complete routing of the 5 m cable. The cable must be secured, protected, and kept away from heat zones, moving parts, and sharp edges.

Important recommendations:

• check that the installation is indeed in 12V DC;
• respect the polarity of the batteries;
• install the fuse holders according to the wiring diagram;
• secure the relay in a stable and accessible area;
• protect cable passages with sheath or conduit if necessary;
• avoid taut or pinched cables;
• have the installation checked by a professional if in doubt.

Things to know before purchase

This product is an automatic coupling-separating relay, not a DC/DC charger. For certain lithium batteries or installations requiring regulated charging with a specific curve, an appropriate DC/DC charger may be necessary.

The 5 m model is recommended for long but controlled wiring distances. For an even more distant installation, the 6 m version may be more suitable.

2-year warranty

VEV / 15863