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IBS 12 Volt 2nd Battery Management System with Boost Module


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Dual Battery system with boost module.

The IBS dual battery system uses a 200 amp relay together with a microprocessor to offer a reliable and easy to install system for adding a second battery to any vehicle.

We recommend installing the Relay Booster Module. The module will enable linkage of the main system even if the starter battery has failed.

In case of a complete discharge of the starter battery (start up of engine from starter battery is no longer possible), the "Link" button on the IBS battery monitor (IBS-DBS/BM3 or DBi-DBS) will enable the user to connect to the Auxiliary Battery to start the vehicle.

In very cold weather or when starting capacity is reduced the RBM supports the relay to make sure the contacts stay properly closed during link start, this extends the relay life.

"""It's nightfall, you're someplace that's not on the map, sinking a coldie from the car fridge, reading last week's paper and playing your favourite cd. And tomorrow night you can do it all again. Thanks to TJM's Battery Management Systems you don't have to worry about getting stuck outback. You can confidently run winches, fridges, auxiliary driving lights and communication equipment, without compromising your starter battery, no matter where you stop. At TJM we analyse your electrical requirements and recommend either the Intelligent Battery System (IBS) or the Dual Battery System (DBS). They?re easy to connect, will withstand any climatic condition and are durable enough to even handle the rigor's of military use. Hooking up with a TJM Battery Management System is like taking an insurance policy with you when you?re on an outback adventure."""

The TJM IBS Dual Battery Kit  Includes In Cab Display with a state-of-the-art system using a RISC micro-computer chip to either isolate or link multiple batteries as needed. Normal operation separates the starting battery to safely power electrical accessories when the vehicle isn't running. An override button links the batteries for high-load uses such as winching and is also used for self jump-starting. In-cab monitoring, which uses an LED display to show each battery's state of charge, is available. The system is offered in 12-volt and 24-volt models (controls four batteries). Installation involves an included power cable and a pre-made four-wire harness. The IBS won a Global Media Award as one of the best new products at the 2009 SEMA Show.

This kit includes:

  • 200A Relay (12v Systems)
  • In-cab monitor with flush mount (optional mounts available)
  • Wire Harness
  • 10' of 4g positive and negative cables
  • All connectors needed to complete installation


  • Low Battery Alarm on both batteries (Beeping and flashing LEDs) - Can be de-activated by pressing display button.
  • Selectable display (bright or dim)
  • Link Failure alarm (beeping and flashing LED)
  • Forcable Link Deactivation in case of aux battery failure.
  • Bi-Directional Automatic  Battery Linking
  • Manual Battery Linking - 30 & 120 min


Battery Connection Manual "link"

In case of emergency (in the case of a defective or discharged starter battery "Main") or in the case of higher power needed, the two batteries (Main & Aux.) are connected by the "link" button is activated (red LED manually connected lights up). After a period of 30 minutes (or immediately after activating the button "auto"), the system switches back to automatic mode. When using an electric winch the system can be activated by double-clicking the “link” button, the battery connection then remains for 180 minutes. In this status every 30 seconds a beep sound comes up to remind you (Auto Return sounds) after the time expired. The load balancing function with the manual battery connection reduces the load on the alternator, the wiring and the batteries when using the winch.

Alarm functions:

Alarm Low Battery

If the battery voltage to the starter battery (Main) drops for a longer periods below 12V, the red LED and beep at a slow blink rate is present (blinks at 2 sec interval).

If the battery voltage at the aux battery is for a longer time under 12V, the red LED flash frequency with fast & beep (the blinking interval 6 seconds).

Use the Display button to turn off the beeper. The flashing red LED goes out when the battery voltage exceeds 12V again.

Link fault alarm:

The system monitors the charge on both batteries. If the system senses at an applied load (alternator, solar, charger) that there is no charge on the other battery, the link fault alarm with a flashing green LED "linked" is displayed and you hear the beep. If this error occurs, you should immediately check the wiring of power cables (relay, battery terminals, crimp contacts, control relays). Once the errors are corrected, the alarm will automatically reset.

Disabling automatic and manual link function of dual battery system

If there is a problem with the auxiliary battery (Aux) a break down of the battery cells, short circuit or defective battery case, the alternator operates in short circuit, which can damage it seriously. In an emergency, the battery system can now be operated, in the basic vehicle configuration (alternator, starter battery without charge to the auxiliary battery). ) By pressing the link button for 6 seconds (until the sounding of the beep), the link function is disabled.

In this operating state no manual or automatic battery connection can be executed. This feature can be reset after solving any cabling problems (by pressing the "Auto" button for 6 seconds the auxiliary battery will be reconnected). Now the system is back working actively with all functions.

Use of the winch

Connecting a winch according to wiring diagram for the starter battery.

Schematics for Dual Battery System DBi-DBS

  1. Load distribution (Load Sharing):
    While using a powerful winch (Warn/Super winch) or inverters (e. g. US80/12V/24V 800W) it is recommend to activate the Load Sharing Function (manual linkage of batteries). For longer jobs it is recommended to keep the engine running. The Load Sharing Function of the Battery Monitor will increase the output power of your winch considerably.

  2. Manual connection of the batteries:
    If you choose adequate power cables the Auxiliary Battery can support even a defective or a empty Starter Battery to start safely the motor. In the same way you can start big Diesel engines (also in wintertime).

Data sheet DBi-DBS 12V/24V

Order - Nr. DBi-DBS DBi-DBS/24V
Battery system dual dual
Mounting place motor/innerroom motor/innerroom
Recommended power cable 16..35mm2 16..35mm2
System voltage 12V 24V
Voltage working range 8..16V 16..32V
Stand-by consumption at 12.5 V 0.9 mA 0.9 mA
Consumption on-state (relay) 0.6 A 0.6 A
Relay Continuous load current 200 A 100 A
Relais current inrush 500 A 250 A
Relay contact material Silver (AG SnO2) Silver (AG SnO2)
Manual linkage of batteries (link) yes with display yes with display
Automatic batteries linkage to charge starter battery (Alternator) yes yes
Automatic batteries linkage to charge board battery (Solar) yes yes
30 min autoreset(link) yes yes
Batteries status monitor no no
Alarme low battery yes yes
Link fault alarm yes yes
Option Three Batteries System with IBS-DBR with IBS-DBR
Applications for utility vehicles utility vehicles
Kit for installation yes (without power cables) yes (without power cables)

  • Shipping Weight: 1lbs
  • Manufactured by: Slee Off Road

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This product was added to our catalog on Thursday 13 March, 2014.

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