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IBS-DBS Dual Battery Systems

IBS-DBS/12V(24V)-EM Dual Battery System

The next generation of IBS-DBS with software 8.0 is available with automotive approval ECE 10R E24. The unit looks the same and is compatible with existing installations. The new electronics offers now dual supply, meaning a battery can be replaced while the system is still supplied from the other battery. Beside all the function known of Software 6.3, system offers trailer battery recognition (Aux battery can be removed and system switches to single battery mode, also in 6.4 available) and over charge alarm, if alternator runs over 15V RBM (Relay Booster Module) can also be installed as in the past to extend link start feature if starter battery has failed due to shortened cell(s) or crack in the battery case.


New features:


  • Dual supply hardware for improved functionality
  • E24 approved unit with 3kW surge suppression
  • Alternator over charge alarm, if diodes installed

  • Trailer battery recognition and single battery mode
  • auto link at 13.1V optimized for smart alternator


Important Market information:


In some markets some cars come with smart alternator feature, in some brands this feature can be de-activated in the ECU. Others with voltage reducing alternators can have a mini ATO diode installed replacing the alternator fuse compensating charge with +0.6V (check LandCruiser J7,J15,J20, Hilux, know from Australian market).


Models available:


  • IBS-DBS/12V-EM, Dual Battery System 12V E24
  • IBS-DBS/24V-EM,  Dual Battery System 24V E24
  • IBS-SDK,                Mini ATO diode compensation
E-Mark glue to housing
E24 mark

Wires of IBS-DBS

wire black              - Battery (GND)

wire red                +Battery (Main)

wire blue               +Battery (Aux)

wire green             Control solenoid (ER2)






IBS-DBS Dual battery system with uProzessor and Relais 200A
Detail Monitor IBS-DBS
Relay open
Relay in housing

IBS-DBS Functions

Display of Battery Voltage (Energy Level)

The new IBS_DBS software version 8 (is replacing version 6.3 and 6.4) with new features is now available and will be described below with

LED indicators:

  • green: Batteries are in the safe working range
  • yellow: check batteries
  • red: Batteries should be charged

The LED’s show the energy level if all loads are switched off:
 12.6V = 100%
 12.4V = 75%
 12.2V = 50%
 12.0V = 25%
 11.0V = flashing and beeping indicates low battery situation

This function is called by pressing the display button for about 30 seconds.

Display of Charge Voltage while charging

LED indicators:

  • red:     >14.5V: High loading of Batteries, may be present at cold ambient temperature for a longer time.
  • yellow: >14.0V: Proper charge mode.
  • green:  <14.0V: Save charge mode, no damage to batteries.

New bi-directional Automatic Battery link

While the engine is running the Main and Aux batteries are linked together for parallel charging from the alternator (green LED linked is on). If the engine is stopped, the two batteries will be disconnected automatically with some delay. Appliances as fridges, lights, compressors, inverters are now safely fed from the Aux battery. With the additional charge by solar equipment, battery charger or generator is sufficient for charging, the starter battery will be charged automatically with Aux battery together (green LED "link" lights).

Manual Battery "link"

In an emergency situation (defective or empty Main Battery) or in case of higher power consumption the two batteries (Main & Aux) may be connected together by activating the link button (red LED manually linked is on) After a laps of time of 30 minutes (or immediately after activating the auto button), the system returns to the automatic mode. When using an electric winch, the battery connection can be activated for 180 minutes by pressing twice the link button. In this mode sounds every 30 seconds a Beep to remind this status(Auto return after time expired). The load sharing function with the manual battery connection reduces the load on the alternator, the wiring and the batteries in the use of the winch.
Alarm functions:

Low Battery alarm: If the battery voltage of one or both of the batteries, is for a longer period below 12V, the sound Low Battery with "Beep" and the LED "Low Battery" of the corresponding battery (Main and / or Aux) flashes. With the Display button, the "Beep" is switched off. The blinking LED "Low Battery" is reset if the battery voltage is exceeding 12V.

Link failure alarm: The monitor monitors the charge on both batteries. When fitting charge ( from alternator, solar, charger) no charge to the other battery is detected, the link error alarm with flashing green LED "linked" and the “Beep” sounds. If this error occurs, check immediately the wiring of the power cables to (relay, battery terminals, crimp contacts, control relays). After bug fixes, the alarm will automatically reset.

Deactivation of automatic and manual battery dual link function:

If there is a problem with the auxiliary battery (Aux) such as short circuit of cells, short circuit or defective battery housing, we recommend to activate the security mode by pressing the “link” button for more than 6 Sec. In this mode no manual or automatic link is possible anymore to protect the alternator against overheating. After the aux battery has been fixed or replaced this security mode is to be reset by pressing “link” for 6 Sec. Now manual and automatic link are operational again.

Winch application

Connect an electrical recovery winch to the main battery as shown in the wiring diagram.

IBS Dual Battery System  with link deactivation if Trailer Battery is missing.

The new software 8 with the new features is now available:

- Trailer battery recognition disengages the automatic and manual link function if the aux battery has been removed.

Hence the monitor is not showing an alarm. This feature is for all who only use the aux battery temporarily due to space and weight limitation such as in pickup installations, camping cabins on pickups or trailer application.

-Over charge alarm is if the alternator charges during 15mins over 15V. This feature is for markets with hot climate where alternators with reduced output are installed. For these markets we offer charge compensation devices for some cars in the Mini ATO format. If they are not correctly installed, alternator charge could be too high, damaging the batteries.

Connection schematic IBS-DBS

Schematics for Dual Battery System IBS-DBS
test Environment 1
test Environment 2
test Environment 3

Data sheet IBS-DBS 12V and 24V

Order - Nr. IBS-DBS/12V-EM IBS-DBS/24V-EM
Supply Voltage 4..16 V 8-32V
System Voltage 12V 24V
Measuring Range (sense wire blue) 8..16V 16-32V
Display Range (Battery Voltage) 11.0V..12.8V 22.0V..25.6V
Alarm Level Main and Aux 12.0V 24.0V
Display Range (Charge) 13.0V..14.5V 26.0V-29.0V
Accuracy +/-1% +/-1%
Consumption Monitor 1mA 1mA
Consumption max. Display active (30 sec) 80mA 80mA
Isolator link-on/off threshold 13.1V/13.0V 26.2V/26.0V
Consumption on-state (relay) 0.6 A 0.6 A
Relay Continuous load current 200 A 100A
Relais current inrush 500 A 250A
Relay contact material Silver (AG SnO2) Silver (AG SnO2)
Free combination of batteries possible? yes yes
Operating Temperature -40°..+80° C -40°..+80° C
Housing ABS black ABS black
Sealing level IP40 IP40
Size, dimensions 100x65x24 [mm] 100x65x24 [mm]
Weight 800g 950g
red Supply/Sense (Main Battery) Supply/Sense (Main Battery)
black GND (Main Battery) GND (Main Battery)
blue Sense (Aux Batterie) Sense (Aux Batterie)
green Control Relay (open collector) Control Relay (open collector)
Protected against: against wrong polarity against wrong polarity
  against overload of solenoid driving circuit on PC Board with  SMD Electronically Security Devices, no fuses have to be replaced against overload of solenoid driving circuit on PC Board with  SMD Electronically Security Devices, no fuses have to be replaced

Changes to specifications without prior notice!

Do not hesitate to contact your local dealer for further information!

Doppelbateriesystem IBS-DBS