12V Battery Against Excessive Discharge Controller With Sound Alarm / Anti-Over-Discharge Protection Board
Review: 5 - "A masterpiece of literature" by John Doe, written onMay 4, 20020

12V Battery Against Excessive Discharge Controller With Sound Alarm / Anti-Over-Discharge Protection Board

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Designing a 12V battery protection system with sound and light alarms, along with anti-over-discharge features, requires electronic components and a basic understanding of circuits.

Here is a simplified outline of how you can create such a system:

Components Needed:

Microcontroller: An Arduino or similar microcontroller will work well for this project.

Voltage Sensor: Use a voltage divider to bring down the battery voltage to a range the microcontroller can handle.

Buzzer: For the sound alarm.

LEDs: For visual alerts.

Relay Module: To control any connected load or disconnect it in case of over-discharge.

Transistors (NPN and PNP): For controlling the buzzer, LEDs, and relay.

Resistors and Capacitors: For voltage dividers, filtering, and current limiting.

Diodes: For protection against reverse voltage and voltage spikes.

Connectors and Wires:For making connections.

Circuit and Operation:

Voltage Sensing: Use a voltage divider circuit to scale down the battery voltage to a level that can be read by the microcontroller's analog pins.

Microcontroller Programming: Write code to continuously monitor the battery voltage using the ADC (Analog-to-Digital Converter) pins of the microcontroller.

Alarm System: When the voltage drops below a certain threshold, trigger both the sound alarm (buzzer) and the visual alarm (LEDs). You can vary the alarm intensity based on the severity of the discharge.

Anti-Over-Discharge Protection: Use the microcontroller to control a relay module. When the voltage reaches a critical level, use a transistor to turn off the relay, disconnecting the load from the battery to prevent further discharge.

Diode Protection: Place diodes to protect against reverse voltage and voltage spikes.

Power Supply: Power the microcontroller from a separate, stable power source (not the battery being monitored) to ensure continuous monitoring, even if the battery voltage drops significantly.

User Interface (Optional): Add user interface components such as buttons, an LCD display, or an OLED screen for user interaction, settings adjustment, and status display.

Testing and Calibration: Test your circuit thoroughly using a power supply to simulate different battery voltage levels. Calibrate the thresholds for alarms and protection to match your specific battery and application.

Enclosure and Mounting (Optional): Design an enclosure for your circuit and battery, ensuring proper ventilation for the battery. Securely mount the components.

Documentation and User Manual (Optional): Create a user manual explaining how to set up, use, and troubleshoot the system.

Technical Details 

  • With sound and light alarm, there is no protective effect is straightforward
  • The input and output are used pluggable terminal blocks for ease of use
  • The board after the maximum allowable current 30A, suitable for most 12V batteries; 30A refers to the process by the relay contacts of the load current, not the battery current (capacity)


  • The main chip: LM358
  • Suitable for 12V battery, when the battery voltage is normal, the green light is on board, and the output ON; when the battery is over-discharge (less than 10.4V or so), the board will automatically disconnect the battery output, the red light is on and the buzzer is called, to achieve sound and light alarm, enabling master battery discharge status, prevent over-discharge the battery, damage the battery
  • Its power consumption: Static: Since consumption is about 12 mA (battery voltage is normal); News: Self-consumption is about 100 mA (when battery voltage)

Physical Attributes

  • Length * Width * Height  (mm) : 52 * 45 * 35 mm
  • Weight (gm) : 30

Package Includes

  • 1 x 12V battery against excessive discharge controller with sound alarm / anti-over-discharge protection board

Customer Reviews

Based on 1 review
Mahendra Pal

12V Battery Against Excessive Discharge Controller With Sound Alarm / Anti-Over-Discharge Protection Board