What is the difference between Power and Energy?

Energy storage systems are designed with both your power and your energy needs in mind. SunVault storage systems have industry-leading power capabilities and energy storage capacities. Let’s review the difference between power and energy:

  • Power is the amount of electricity needed to run an appliance at a given moment. This is the instantaneous supply of electrical energy, and it is measured in kilowatts (kW).

  • Energy is the amount of power needed to run an appliance for a period of time; or the amount of stored electrical capacity and it is measured in kilowatt hours (kWh).

  • For example, let’s say an electric space heater requires one kilowatt (kW) of electricity to operate. Running that heater for one hour will use up one kilowatt hour (kWh) of energy; running it for 13 hours will use 13 kWh of energy; and running it for 26 hours will use 26 kWh of energy.