12V 140A voltage-sensitive relay kit – Dual battery isolator IP65 – Model 2 m

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The 12V 140A voltage-sensitive relay kit – model 2 m is designed to create a compact dual battery installation when the main battery and auxiliary battery are placed close to each other. It allows automatic charging of an auxiliary battery via the alternator while protecting the starter battery when the engine is off.

This 2 m version is particularly suitable for short installations in an engine compartment, a technical trunk, a converted utility vehicle, a small boat, or a recreational vehicle with nearby batteries.

Highlights of the 2 m model

• Compact version 2 m: ideal when batteries are installed nearby.
• 12V automatic relay: coupling and separation according to circuit voltage.
• Starter battery protection: prevents draining the main battery when stopped.
• High current 140A: suitable for onboard 12V auxiliary installations.
• IP65 housing: protected against dust and water splashes.
• Complete kit: relay, cables, terminals, fuse holder, connectors, and accessories included.
• 2-year warranty.

This automatic combiner-separator allows managing two 12V batteries in a vehicle or onboard installation. When the engine is running and the voltage rises, the relay connects the two batteries to allow charging of the auxiliary battery. When the voltage drops, it isolates the batteries to keep the main battery available for starting.

The 2 m model is the most practical choice for installations where the cable path remains short. It limits unnecessary lengths, facilitates a clean installation, and is suitable for compact configurations: converted van, small camper, pickup, 4x4, boat, UTV, or utility vehicle equipped with a secondary battery.

Thanks to its nylon plastic casing, M6 stainless steel studs, and IP65 protection rating, this relay is designed for environments exposed to vibrations, humidity, and dust.

Recommended uses

• Adding an auxiliary battery in a converted van or utility vehicle.
• Powering 12V equipment from a secondary battery.
• Dual battery setup on 4x4, pickup, ATV, or UTV.
• Compact installation on a boat or 12V marine application.
• Automatic separation between engine battery and service battery.
• Protection of the main battery when using accessories while stationary.

Automatic operation

• The relay activates when the voltage reaches approximately 13.3V.
• The two batteries are then connected to allow charging.
• The relay deactivates when the voltage drops to 12.8V.
• The batteries are separated to prevent the engine battery from discharging.
• The system operates without a mandatory manual switch.

Technical specifications

• Model: JDQTJ-2M
• Version: model 2 m
• 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
• 4 red battery cables 110A, total length 2 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

Installation tips

The 2 m version is recommended when the distance between the batteries is reduced. Before installation, it is advisable to check the cable route to avoid mechanical stress, friction, or passing near a too hot area.

For a reliable assembly:

• Install the relay on a fixed and accessible support.
• Respect the battery polarity.
• Protect the cables against vibrations and metal edges.
• Check the tightening of the terminals and connections.
• Use the provided fuse holders according to the installation diagram.
• Have the assembly checked by a professional if in doubt.

This relay is designed for a 12V DC installation. It is not suitable for a 24V or 48V system.

For some lithium batteries or installations requiring a precise charge curve, a specific DC/DC charger may be more suitable than a simple relay combiner-separator. Always check your auxiliary battery's recommendations before installation.

The 2 m model is the most suitable if you are looking for a simple, short, and clean installation. It avoids having excess cable in a small compartment and facilitates integration in vehicles where the two batteries are close.

It is a relevant version for compact assemblies, small converted vehicles, and 12V auxiliary installations that do not require a long connection between the batteries.

2-year warranty

VEV / 15861