Reactive Power: Definition & Meaning -
Skip to content
Cart (0 item)

Your cart is empty

Reactive Power: Definition & Meaning


Reactive Power Definition

Reactive power is a component of electrical power in alternating current (AC) systems that does not perform useful work but is essential for maintaining voltage levels and ensuring the stability of the electrical grid. Measured in volt-amperes reactive (VAR), it arises due to the phase difference between current and voltage, mainly because of inductive or capacitive loads.

Key aspects and significance in electrical and solar systems include:

  1. Nature of Loads: Electrical loads like motors, transformers, and capacitors can introduce phase shifts between voltage and current. These loads either store or release energy, causing the generation of reactive power, as opposed to real power which does the actual work.

  2. Essential for Stability: While it doesn't perform work in the traditional sense, it is vital for maintaining voltage stability in electrical grids. Voltage levels, in turn, are crucial for the proper functioning of electrical equipment.

  3. Real vs. Reactive Power: In AC systems, total power (apparent power) comprises both real power (active power) and reactive power. Real power, measured in watts (W), does useful work, whereas reactive power supports system stability.

  4. Solar Inverters: Modern solar inverters can manage it, allowing them to support grid stability and comply with grid codes, especially during periods of rapid voltage changes or fluctuations.

  5. Compensation and Management: It can be compensated for or managed using capacitors, reactors, or advanced electronic equipment to improve system efficiency and ensure grid reliability.

  6. Economic Implications: Excessive reactive power in electrical grids can lead to inefficiencies, potential penalties for industrial users, and the need for costly infrastructure upgrades.

In the context of solar energy systems and broader electrical networks, understanding and managing reactive power is paramount for grid reliability, efficient energy transmission, and optimal equipment operation.

Usage: "With the integration of advanced solar inverters, the solar plant was able to manage its reactive power output, supporting the local grid's voltage stability."

Know your solar definitions to learn and understand more about solar power. Develop your solar lingo here.

The Ultimate Solar + Storage Blueprint (Mini Course)

Struggling to understand how solar + storage systems actually work? Looking to build or buy your own solar power system one day but not sure what you need? Just looking to learn more about solar, batteries and electricity?

Join 15,000+ solar enthusiasts breaking free from their energy dependence with this short step-by-step video course that will make you a solar + storage expert. Start your journey to energy independence today.

Learn More Now

Who is is the #1 digital platform that enables consumers & businesses to source and purchase complete solar + storage solutions direct, saving you thousands in time, energy and money! With over 40,000+ happy customers, we’re on a mission to make solar simple, transparent and affordable.