What is the difference of installed power and input power?

Installed power refers to the total capacity of a system or device, usually expressed in watts or kilowatts, based on its design specifications. Input power, on the other hand, is the actual power consumed by the system during operation, which can be influenced by factors such as efficiency and load conditions. In many cases, input power is less than or equal to installed power because not all capacity is utilized at all times. Understanding this distinction is crucial for evaluating system performance and energy efficiency.