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07.28.2022

kW vs. kWh: Power vs. Energy

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What’s the Difference Between kW and kWh (Kilowatts and Kilowatt Hours)?

When talking about distributed energy, we get a lot of questions about kilowatts versus kilowatt hours, the concepts of power and energy. Power is the amount of electricity being generated at a specific point in time. Energy is the cumulative amount over a period of time.

For a better understanding of kilowatts (kW) vs. kilowatt hours (kWh) and how they affect your energy system, see our latest video, below, and connect with our team today. At EnTech Solutions, we make energy easy to understand.

The Difference Between kW and KWh is the Difference Between Power and Energy

Power is measured in kilowatts or kW while energy is power multiplied by time, measured in kilowatt hours or kWh.

If you use 50 kilowatts of power for one hour, you’ve used 50 kilowatt hours of energy. Think of it as water flowing through a hose into a bucket. The power is how fast the water flows out of the hose. The energy is how much water has accumulated in the bucket.

kW vs. kWh for Battery Storage and EV Charging

In distributed energy, battery energy storage has both power (kW) and energy (kWh) ratings. The power rating tells you the maximum amount of electricity it can deliver at one time. The energy rating tells you how long it would last at that maximum output. So, a battery with a power rating of 100 kilowatts and an energy rating of 200 kilowatt hours can deliver 100 kilowatts for two hours.

When it comes to EV charging, the power of the charger is the speed at which it can charge a vehicle.

If this is confusing, don’t worry. At EnTech Solutions, we make energy easy to understand.

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