EBC 2405
Battery Charger Units – EBC Series

Charging Lead-Acid batteries in three controlled stages for best performance

SMPS technology for maximum efficiency and reliablity with minimum heat dissipation.

EBC 2405M can deliver continuous charging current of 5A into 24V battery system (voltage is set to 27.6Vdc, with an option of up to 29.4Vdc) These battery chargers are designed with performance in mind and special care is taken for protecting and extending the life-time of the battery. EBC 2405M is designed with “Switched Mode” technology, where the switching transistor has only two states, ON or OFF, which increases the overall efficiency, hence reduces the excess heat dissipati... »

EBC 2405M can deliver continuous charging current of 5A into 24V battery system (voltage is set to 27.6Vdc, with an option of up to 29.4Vdc) These battery chargers are designed with performance in mind and special care is taken for protecting and extending the life-time of the battery.

EBC 2405M is designed with “Switched Mode” technology, where the switching transistor has only two states, ON or OFF, which increases the overall efficiency, hence reduces the excess heat dissipation and in return, increasing the device life-time and reliability.

The control system is also designed in such a way that; battery is charged in three stages:

  • Constant current mode (protecting battery cells)
  • Constant voltage mode (reducing the charge current)
  • Float charge (compensation of internal self-discharge)

Constant current mode makes sure that; when the battery is drained down below its rated capacity, the high charge current flow into the battery is limited in order to protect the cells and reduce damage to the plates.

As the battery capacity is recovered, each cell voltage reaches up to 2.30Vdc to 2.45Vdc level, which means that the required charging current starts to reduce.

When the required battery terminal voltage is fully reached, the charger keeps supplying just enough current in order to compensate for the internal self-discharge (float charge). This ensures that the battery can maintain its high charge state and deliver its rated out-put current, when ever required.

The charger is also designed to operate with Constant Power output, where full output power can be delivered into the load up to 60° C ambient temperature. The output power is linearly de-rated down to zero at 70°C. This function ensures that the charger can deliver maximum available power to the load under any operating conditions without reducing charger reliability.

Typical Cell charging characteristics of the charger is shown in the table. The Cell is part of the battery and 24V batteries contain 12 cells.

Factory setting of the charger allows each Cell to be charged to 2.30Vdc, which corresponds to 27.6Vdc terminal voltage. User can use an option up to 2.45Vdc per Cell, which corresponds to 29.4Vdc battery terminal voltage.

Each charging stage can be seen on the table. Initial cell charging is achieved with constant current mode, which limits the current such that it does not damage the cell plates. Normal charging time should be calculated as 10hr to 12hr. This requires typical charging current rating of 10% of the rated battery current capacity.

After the initial charging stage is completed, charge current starts to decrease as the cell voltage approaches 2.30Vdc. This takes approximately 60% of the charging period and is necessary to equalize each Cell voltage within the battery. During this period, the charger ensures stable constant voltage across the battery terminals.

After the charging is completed, the battery keeps draining current from the charger in order to compensate its internal resistive losses, called Self Discharging of the battery. This needs to be compensated in order to keep the battery charge at its highest condition.

If reverse polarity protection is required, user has to fit an external fuse in the charge circuit with the indicated rating in the table.

Charge failure output can be used with a relay, connected to V+ so that other devices can be controlled through the alarm relay. Under normal operating conditions, the relay will be energized.

The alarm output is solid state relay, which can sink up to 50mA DC current.

The charger enclosure is made from Aluminum alloy metal sheet and can either be screw fitted directly on the panel or it can be used together with rail mounting kit. Rail mounting kit is an option and has to be decided during purchase. Total weight is 330gr.

Care should be taken in order to make sure that the perforations on the metal enclosure is not covered and
free air ventilation is maintained within the panel. Otherwise, excess accumulated heat will degrade the overall efficiency of the charger unit.

Earth connection has to be made securely as the case is made from metal. Also proper noise filtering can only be active with a good earth connection of the charger unit.


  • 160Vac to 300Vac input voltage range
  • 45Hz to 440Hz input supply frequency range
  • Capability to work direct from 240Vdc to 365Vdc supply voltage
  • 27.6Vdc factory set DC output terminal coltage (option up to 29.4Vdc)
  • 5Adc continous output current into Load
  • Output over-voltage protection
  • Power de-rating function
  • Capability to work continously into short-circuit
  • Parallel connection for higher output current rating and redundant operation
  • Series connection capability for higher output voltage requirements
  • No cooling fans, all natural convection cooling
  • Aluminum alloy case for robust handling and easy mounting
  • Both screw type or rail mount kit avaliable (Rail mount kit is an extra)
  • Overall efficiency > 82%
  • Boost charge function
  • Reverse power and reverse polarity protection
  • Noise input filter
  • Dry contact alarm output
  • Compatible with all types of Lead Acid and Nikel Cadmium (Ni-Cad application must be stated upon order) batteries
  • 3 stage battery charging
    • Constant Current Mode - to protect the battery cells
    • Constant Voltage Mode - to reduce the charge current
    • Float Charge Mode - to compensate internal self-discharge
  • SMPS technology increases the overall efficiency, hence reduces the excess heat dissipation in return, increasing the device life-time and reliability
  • Elimination of fans and moving parts maximize the reliability
  • The power de-rating function ensures the charger protects itself at high temperatures and does not fail
  • Low output voltage ripple allows the unit to be used as a Power Supply if required (Must be stated while ordering)
  • Three stage charging ensures best performance and reliability
  • The noise input filter provides EMC reduction
  • User operated Boost Charge function to replenish the battery charge storage capacity to high levels
  • The alarm output can be connected to a Gen-set controller for monitoring


Input Specifications

  • AC Input Voltage Range :
    150Vac - 300Vac Single Phase Connection (Phase-Neutral)
  • Operation Frequency Range :
    45Hz - 450Hz
  • DC Input Voltage Range :
    250Vdc - 400Vdc
  • Nominal Input Current (at Full Load) :
    1.50 A (230Vac Input Voltage)
  • Efficiency : 
  • Input Power Factor :
    Capacitive (No Power Factor Correction)
  • Input Fuse Protection :
    6.3A / Slow-blow Type 5x20mm Internal Glass Fuse
  • Inrush Current : 
  • Input Terminal Type : 
    2.5mm² Screw Terminal.

Output Specifications


  • Output Voltage Range : 
    27.6Vdc  (Factory Set)
    (25.5 - 30.0Vdc Optional at Order)
  • Output Current : 
  • Output Terminal Type : 
    2.5mm² Screw Type Terminal
  • Output Short Circuit Current : 
    10% > Nomimal Output Voltage
  • Output Ripple Voltage :
    < %1.0 Nominal Output Voltage ( 10Hz - 100Khz )
  • Output Noise :
     < 1V pk-pk
  • Line Regulation : 
    < %1 (at Constant Output Load)
  • Load Regulation : 
    < %1.5 (No Load to Full Load)
  • Reverse Polarity Protection : 
    10.0A / Slow-blow Type 6.3 x 32mm Internal Glass Fuse

Front Panel Indicators


  • Green LED : 
    Healthy Operation
  • Red LED : 
    Failure in the System
  • Green and Red LED : 
    Output Fuse Blown



Environmental Conditions 

  • Operating Temperature Range :
    -25°C to +60°C (at Full Load and Max Input Voltage)
  • Storage Temperature and Humidity Range : 
    -30°C to +80°C (10%rh to 90%rh, Non-condensing)
  • Cooling System :
    Convection Cooling (No Fans Used)
  • Relative Humidity : 
    10%rh to 95%rh, Non-condensing
  • Operating Altitude : 
    1200m Operating at Full Load, 1200m to 4000m De-rate Linearly from Full Power to 50% Power 
  • Galvanic Isolation : 
    Input - Output 4KV; Output - Earth 500Vac
  • ESD Protection : 
    8kV (Free Air Discharge on the Metal Case)
  • EMC Conformance :
    IEC/EN 61000-6-3
  • EMI Conformance : 
    EN 55011 / EN55022-B
  • Vibration : 
    10 to 55Hz, 19.6m/s² Constant Sweep, for 1 hour X, Y, Z Axis Each
  • Protection Class : 
    IP20 All Sides, IP00 Mounting Side

Additional Specifications

  • Alarm Output / Function : 
    The Solid State Alarm output is energized when operating under normal conditions. Max 50mA.
  • Boost Charge Function : 
    The Boost Charge function is activated when the positive pole of the battery is applied to the related input terminal.  
  • Output Over-voltage Protection : 
    Not Supported
  • Heat Protection (Power De-Rating) : 
    Not Supported

Mechanical Specifications

  • Enclosure Material : 
  • Weight : 
    415 gr
  • Dimensions (W x H x D) : 
    136.5 x 110.8 x 66.5 mm.
  • Mounting : 
    Screw Type Panel Mounting



There is no software added yet.
  • EBC Series - How can the output voltage on EBC Series Battery Chargers be adjusted?

    EBC 1205, EBC 1210, EBC 2405 and EBC 2410 models have fixed output voltages and can not be adjusted after production. However, because the voltage is adjusted by the factory, it can be adjusted to customer specifications if indicated while ordering. 

    EBC 2420 and EBC 2440 models have on board voltage adjustment trimmers where the user can adjust the output voltage to their specification. Please follow the EBC Series User Manual for this process. The manuals can be accessed from the Documents tab on the related product pages.

  • EBC Series - What is Boost Charge and where is it used?

    Boost Charge or Cell Equalization function increases the output voltage while decreasing the charge current. It is activated externally and can be used periodically in order to replenish the battery condition and charge hold capacity. Please note that Boost charge function has to be used according to the battery manufacturers instructions! 

    Boost Charging will be activated according to the table shown below. During Boost charging, the charger terminal voltage will increase but the but the charge current will be reduced to 50% of its rated output capacity in order to protect the batteries from getting damaged. During Boost charge period, boost charge control input must stay active. 

    EBC 1205 - EBC 1210                    Connect Boost Charge input terminal directly to the battery positive terminal

    EBC 2405 - EBC 2410                    Connect Boost Charge input terminal directly to the battery positive terminal

    EBC 2420 - EBC 2440                    Connect Boost Charge input terminal directly to the battery negative terminal

    Boost charge characteristic is shown in the graph below. The boost charging function acts according to the battery manufacturers specifications. 


  • EBC Series - What happens if the battery terminals connected to an EBC Series Battery Charger are reverse polarity?

    The EBC Series Battery Chargers provide reverse polarity protection function. If the battery terminals are connected in reverse polarity, chargers will trip its output fuse for protection. The 5A and 10A models (EBC 1205, EBC 1210, EBC 2405 and EBC 2410) have internally fitted fuses for protectionbut the 20A and 40A models (EBC 2420 and EBC 2440) have internal semiconductor controlled reverse polarity protection adn this requires no service. The units will recover from protection mode, after the reverse polarity connection is removed.

    Please refer to the table below for more information on fuse ratings. For more information regarding Reverse Polarity Protection function, please refer to the EBC Series User Manual which can be accessed through the Documents tab on the related product page. 

    Model Fuse Rating & Type Where to Fit

    EBC 1205

    EBC 2405

    10A, Slow blow fuse Internally Fitted

    EBC 1210

    EBC 2410

    15A, Slow blow fuse Internally Fitted

    EBC 2420

    EBC 2440

    No fuse requred

    Semiconductor Fuse

    Nothing to Replace