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Commercial Power Saver Capacitor Project


The increasing cost and demand for electricity make energy efficiency a priority for commercial establishments. The concept of a ‘Power Saver’ or ‘Electric Saver’ is not new, yet its application in industrial settings is ever-evolving. This article details a project aimed at minimizing energy consumption and improving energy efficiency through the use of shunt capacitors.

Understanding Power Factor

The power factor is the ratio of real power to apparent power, often denoted as KW/KVA. While KW represents the active or ‘real’ power, KVA comprises both reactive and active power. Lower power factors indicate higher reactive power and reduced efficiency. Thus, optimizing the power factor can significantly impact your electricity bills and energy conservation efforts.

The Technology Behind

  • 8051 Microcontroller: This is the brain behind the operation. It determines when and how to actuate shunt capacitors into the load circuit.
  • Operational Amplifier Circuit: Working in comparator mode, it feeds the time lag between zero voltage pulse and zero current pulse into the microcontroller.
  • LCD Screen: This displays the time lag between voltage and current, helping to monitor the system in real time.

How it Works

  • Monitoring: The time lag between zero voltage and zero current pulses is continuously monitored.
  • Processing: The 8051 Microcontroller receives these inputs and calculates the required adjustment to optimize the power factor.
  • Actuation: The microcontroller actuates the required number of relays, which then introduce shunt capacitors into the load circuit until the power factor approaches unity.

Hardware & Software Specifications

  • Hardware: Lamp, Choke, Crystal Oscillator, Resistors, Capacitors, Transistors, Cables, Diodes, and more.
  • Software: Keil µVision IDE, MC Programming Language in C.


The commercial power saver capacitor project offers a robust and effective method for optimizing power factors, significantly contributing to energy saving projects. Its application could be a game-changer in the long run, not just for industries but also as power saver capacitors for home use.

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