4 ms·

What's the definition of "measured annual energy consumption"?

• jsmith45 5y ago
  It is based on the Energy Star energy consumption criteria. The formula is: 365*24/(1000)*weighted_average_power_consumption (the division appears to be due to using unitless formulas, and wanting a result value in kWH). The weighted average power consumption is based on measured power draw in the following states: "off", "sleep", "Long_idle", and "short_idle". Most desktops under the California rules will use the "conventional" weighting factors of (45%, 5%, 15%, 35%) for the respective power modes in that average. Short idle is basically what you expect. Screen is still on, drives are still spun up. Long Idle allows basic power saving features to have kicked in (like spinning down hard drives), and assumes the screen has gone blank, but that the computer is still in ACPI G0/S0, not in some form of sleep mode.